Data Quality Reports for Session: 123569 User: palm1os Completed: 10/09/2009


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000121.1SGP/MWR/B5 - wrong calibrationsgp5mwravgB5.c1, sgpmwrlosB5.00, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1
D030312.4SGP/MWR/B5 - Intermittent Negative Sky Brightness TemperaturessgpmwrlosB5.a1, sgpmwrlosB5.b1
D030822.4SGP/MWR/B5 - min/max/delta values incorrectsgpmwrlosB5.b1
D040322.2SGP/MWR/B5 - thermal instabilitysgpmwrlosB5.a1, sgpmwrtipB5.a1
D040819.1SGP/MWR/B1/B4/B5 - Data dropouts due to serial comm problemssgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1
D040819.5SGP/MWR/B5 - Loss of thermal stabilizationsgp5mwravgB5.c1, sgpmwrlosB5.a0, sgpmwrlosB5.a1
D050725.4SGP/MWR/B5 - Reprocess: Revised Retrieval Coefficientssgp5mwravgB5.c1, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1, sgpqmemwrcolB5.c1
D050927.4SGP/MWR/B5 - New software version (4.15) installedsgpmwrlosB5.b1, sgpmwrtipB5.a1
D060420.3SGP/MWR/B5 - Reprocess: wrong retrievalssgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1, sgpqmemwrcolB5.c1
D060718.3SGP/MWR/B5 - Mixer temp unstablesgpmwrlosB5.b1, sgpmwrtipB5.a1
D071011.4SGP/MWR/B5 - Intermittent missing datasgpmwrlosB5.b1, sgpmwrtipB5.a1
D080410.3SGP/MWR/B5 - Some rain events flaggedsgpmwrlosB5.b1, sgpmwrtipB5.a1
D080724.1SGP/MWR/B5 - Missing datasgpmwrlosB5.b1
D960129.2SGP/MWR/B1/B5 - Calibration questionablesgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1
D960404.1SGP/MWR/B1/B4/B5 - Reprocess: Error in MWR calibrationsgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0,
sgpmwrlosB5.a1
D960404.2SGP/MWR/B1/B4/B5 - Reprocess: MWR Tuning FunctionssgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0,
sgpmwrlosB5.a1
D961117.6Loss of thermal stabilizationsgpmwrlosB5.a1
D961120.1SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustmentsgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1,
sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1,
sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D980205.2Manually corrected error in header filessgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
D980209.3SGP/MWR/B5 - Reprocess: Calibration updatesgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
D980211.1SGP/MWR/B5 - Incorrect serial numbersgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
D990106.2SGP/MWR/B5 - Software ChangesgpmwrlosB5.a1
D990113.1SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0
D990916.1SGP/MWR/B1/B4/B5/B6 - data file split at 23:59sgpmwrlosB1.a1, sgpmwrlosB1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosB5.a1,
sgpmwrlosB5.b1, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB1.a1, sgpmwrtipB4.a1, sgpmwrtipB5.a1,
sgpmwrtipB6.a1


DQRID : D000121.1
Start DateStart TimeEnd DateEnd Time
10/27/1999171611/15/19991500
Subject:
SGP/MWR/B5 - wrong calibration
DataStreams:sgp5mwravgB5.c1, sgpmwrlosB5.00, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1
Description:
An upgrade of the instrument by the manufacturer significantly changed its 
calibration and the configuration file was not updated with the new calibration
values when the instrument was returned to service.
Measurements:sgpmwrlosB5.00:
  • null(Raw data stream - documentation not supported)

sgpmwrlosB5.a1:
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • Dummy altitude for Zeb(alt)
  • Actual elevation angle(actel)
  • Actual Azimuth(actaz)
  • base time(base_time)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • lat(lat)
  • lon(lon)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrtipB5.a1:
  • Actual Azimuth(actaz)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz Blackbody signal(bb23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(tipsky23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • lat(lat)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(tipsky31)
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mixer kinetic (physical) temperature(tkxc)
  • lon(lon)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Actual elevation angle(actel)
  • Time offset of tweaks from base_time(time_offset)
  • base time(base_time)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Dummy altitude for Zeb(alt)

sgp5mwravgB5.c1:
  • lon(lon)
  • Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
  • base time(base_time)
  • Averaged total liquid water along LOS path(liq)
  • Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
  • IR Brightness Temperature(ir_temp)
  • Dummy altitude for Zeb(alt)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Standard deviation about the mean for the total water vapor amount(vap_sdev)
  • Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
  • Time offset of tweaks from base_time(time_offset)
  • lat(lat)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Standard deviation about the mean for the total liquid water amount(liq_sdev)
  • Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
  • Number of data points averaged for 23tbsky, 31tbsky, vap & liq(num_obs)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB5.b1:
  • Time offset of tweaks from base_time(time_offset)
  • IR Brightness Temperature(ir_temp)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Averaged total liquid water along LOS path(liq)
  • lat(lat)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Dummy altitude for Zeb(alt)
  • base time(base_time)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • lon(lon)


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DQRID : D030312.4
Start DateStart TimeEnd DateEnd Time
12/23/1999060007/10/20021700
Subject:
SGP/MWR/B5 - Intermittent Negative Sky Brightness Temperatures
DataStreams:sgpmwrlosB5.a1, sgpmwrlosB5.b1
Description:
Several related and recurring problems with the SGP MWRs have been
reported dating back to 1999.  These problems were due to the
occurrence of blackbody signals (in counts) that were half of those
expected. The symptoms included noisy data (especially at Purcell),
spikes in the data (especially at Vici), negative brightness
temperatures, and apparent loss of serial communication between the
computer and the radiometer, which results in a self-termination of the
MWR program (especially at the CF).

Because these all initially appeared to be hardware-related problems,
the instrument mentor and SGP site operations personnel (1) repeatedly
cleaned and replaced the fiber optic comm. components, (2) swapped
radiometers, (3) sent radiometers back to Radiometrics for evaluation
(which has not revealed any instrument problems), and (4) reconfigured
the computer's operating system.  Despite several attempts to isolate
and correct it, the problem persisted.

It became apparent that some component of the Windows98 configuration
conflicted with the DOS-based MWR program or affected the serial port
or the contents of the serial port buffer. This problem was finally
corrected by upgrading the MWR software with a new Windows-compatible
program.
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB5.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)


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DQRID : D030822.4
Start DateStart TimeEnd DateEnd Time
01/16/1998000002/10/20032359
Subject:
SGP/MWR/B5  - min/max/delta values incorrect
DataStreams:sgpmwrlosB5.b1
Description:
The values of valid_min, valid_max, and valid_delta for fields tkxc and tknd were 
incorrect. They should be 303, 333, and 0.5 K, respectively.
Measurements:sgpmwrlosB5.b1:
  • (tknd)
  • Mixer kinetic (physical) temperature(tkxc)


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DQRID : D040322.2
Start DateStart TimeEnd DateEnd Time
03/18/2004174703/18/20042338
03/20/2004180803/20/20041952
Subject:
SGP/MWR/B5 - thermal instability
DataStreams:sgpmwrlosB5.a1, sgpmwrtipB5.a1
Description:
The mixer kinetic temperature oscillated with an amplitude of about 3 to 5K.  This 
effected the water vapor and liquid content fields.  It is not known what caused this behavior. 
The instrument was returned for upgrades on 4/2 and the problem has not since been 
observed.
Measurements:sgpmwrlosB5.a1:
  • Mixer kinetic (physical) temperature(tkxc)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)

sgpmwrtipB5.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)


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DQRID : D040819.1
Start DateStart TimeEnd DateEnd Time
02/12/1994000012/31/19942359
Subject:
SGP/MWR/B1/B4/B5 - Data dropouts due to serial comm problems
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1
Description:
Conflicts between the drop shipper program and the
MWR operation program resulted in serial communication
problems which ultimately manifested as spikes and
dropouts in the data.
Measurements:sgpmwrlosB5.a1:
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Actual elevation angle(actel)
  • Actual Azimuth(actaz)
  • base time(base_time)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrlosB1.a1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Actual elevation angle(actel)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • base time(base_time)
  • Actual Azimuth(actaz)
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosB4.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Time offset of tweaks from base_time(time_offset)
  • Averaged total liquid water along LOS path(liq)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Actual elevation angle(actel)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Actual Azimuth(actaz)
  • IR Brightness Temperature(ir_temp)
  • MWR column precipitable water vapor(vap)
  • base time(base_time)


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DQRID : D040819.5
Start DateStart TimeEnd DateEnd Time
08/03/1995000008/03/19952359
08/06/1995000008/14/19952359
08/16/1995000009/06/19952359
Subject:
SGP/MWR/B5 - Loss of thermal stabilization
DataStreams:sgp5mwravgB5.c1, sgpmwrlosB5.a0, sgpmwrlosB5.a1
Description:
Periodically during August and September 1995 all microwave radiometers
at the SGP CART generated error messages in the Site Operations Log
like:

  Time: Sat Aug 19 18:41:20 1995
  MWRLOS.C1, tkxc: Value above Maximum.

This indicates that the temperature of the microwave hardware
(specifically, the cross-coupler or "xc") exceeded its controlled
temperature (47-52 deg C) at which point it was no longer thermally
stabilized and the gain was uncontrolled.  During these periods which
typically last about 8 hours from about local noon until about sunset
the data behave anomalously and should be considered invalid.

Specifically the precipitable water vapor increases and the liquid
water path decreases (and becomes SIGNIFICANTLY NEGATIVE (-0.1 mm) on
clear sky days).  The RMS noise level in the data also increases
sharply.  The 'Tkxc' field appears ONLY in the a0-level data and does
NOT appear in either the a1 (mwrlos) or c1 (mwr5avg) files.  Therefore
THESE ANOMALOUS VALUES HAVE BEEN INCLUDED IN THE 5-MINUTE AVERAGES.

The microwave hardware is thermally stabilized to about +/- 0.1 deg C
by resistive heating.  When the internal temperature rises above the
set point the thermal stabilization of the instrument gain is lost.
>From an examination of the component temperature data it appears that
increasing the set point temperature to about 55 deg C (328 K) would
prevent a re-ocurrance of this problem at the SGP.  The manufacturer,
Radiometrics, concurs that raising the set point will fix this problem
and will not cause other problems.

I will have to carefully examine the MCTEX data to determine whether
this will be a problem for the TWP.  The manufacturer and I had
discussed this possibility prior to building the TWP MWRs (S/N 015,
016, and 017) and those instruments have set points above 50 deg C.
Note that MWR 018 has a set point near 52 deg C (like the TWP models)
but it still experienced a few loss-of-stabilization events.

Note that the instruments with the lowest set points had the most
loss-of-stabilization events.
Measurements:sgpmwrlosB5.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgp5mwravgB5.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosB5.a0:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)


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DQRID : D050725.4
Start DateStart TimeEnd DateEnd Time
04/15/2002230006/24/20052100
Subject:
SGP/MWR/B5 - Reprocess: Revised Retrieval Coefficients
DataStreams:sgp5mwravgB5.c1, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1, sgpqmemwrcolB5.c1
Description:
IN THE BEGINNING (June 1992), the retrieval coefficients used to derive 
the precipitable water vapor (PWV) and liquid water path (LWP) from the 
MWR brightness temperatures were based on the Liebe and Layton (1987) 
water vapor and oxygen absorption model and the Grant (1957) liquid 
water absorption model.

Following the SHEBA experience, revised retrievals based on the more 
recent Rosenkranz (1998) water vapor and oxygen absorption models and 
the Liebe (1991) liquid waer absorption model were developed.  The 
Rosenkranz water vapor absorption model resulted a 2 percent increase 
in PWV relative to the earlier Liebe and Layton model.  The Liebe 
liquid water absorption model decreased the LWP by 10% relative to the 
Grant model.  However, the increased oxygen absorption caused a 
0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly 
significant for low LWP conditions (i.e. thin clouds encountered at 
SHEBA).

Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and 
Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 
22 GHz water vapor line from the HITRAN compilation, which is 5 percent 
smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz 
(1998), provided a better fit to the microwave brightness temperature 
measurements at 5 frequencies in the range 22-30 GHz, and yielded more 
accurate retrievals. Accordingly, revised MWR retrieval coefficients 
have been developed using MONORTM, which utilizes the HITRAN compilation 
for its spectroscopic parameters.  These new retrievals provide 3 
percent less PWV and 2.6 percent greater LWP than the previous 
retrievals based on Rosenkranz (1998).

Although the MWR data will be reprocessed to apply the new monortm-based 
retrievals, for most purposes it will be sufficient to correct the data 
using the following factors:

PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ
LWP_MONORTM = 1.026  * LWP_ROSENKRANZ

The Rosenkranz-based retrieval coefficients became active at SGP.B5 
20020415.2300.  The MONORTM-based retrieval coefficients became active 
at SGP.B5 20050624.2100.

Note: a reprocessing effort is already underway to apply the 
Rosenkranz-based retrieval coefficients to all MWR prior to April 
2002.  An additional reprocessing task will be undertaken to apply 
the MONORTM retrieval to all MWR data when the first is completed. 
Read reprocessing comments in the netcdf file header carefully to 
ensure you are aware which retrieval is in play.
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrtipB5.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)

sgpqmemwrcolB5.c1:
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)

sgp5mwravgB5.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB5.b1:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)


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DQRID : D050927.4
Start DateStart TimeEnd DateEnd Time
07/10/2002170009/13/20052124
Subject:
SGP/MWR/B5 - New software version (4.15) installed
DataStreams:sgpmwrlosB5.b1, sgpmwrtipB5.a1
Description:
A problem began with the installation of MWR.EXE version 4.12 in July 2002. The software 
had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier 
problem.  The software upgrade corrected the earlier problem but introduced a new one that 
caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip 
curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these 
problems.

The new MWR software, version 4.15, was installed on 9/13/2005. As a consequence of this 
upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s.
Measurements:sgpmwrtipB5.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(tipsky31)
  • Blackbody kinetic temperature(tkbb)
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Ambient temperature(tkair)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • 23.8 GHz sky signal(tipsky23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)

sgpmwrlosB5.b1:
  • Mixer kinetic (physical) temperature(tkxc)
  • Ambient temperature(tkair)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz sky signal(sky23)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • (tknd)
  • IR Brightness Temperature(ir_temp)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz sky signal(sky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)


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DQRID : D060420.3
Start DateStart TimeEnd DateEnd Time
10/12/2004172511/12/20041903
Subject:
SGP/MWR/B5 - Reprocess: wrong retrievals
DataStreams:sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrtipB5.a1, sgpqmemwrcolB5.c1
Description:
When the computer and core configuration were upgraded, retrieval coefficients for BF1 
were accidently included in the configuration file.
The correct coefficients for BF5 were applied when the software was upgraded to ver. 4.14 
and the configuration file was updated.
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrtipB5.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)

sgpqmemwrcolB5.c1:
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)

sgpmwrlosB5.b1:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)


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DQRID : D060718.3
Start DateStart TimeEnd DateEnd Time
06/01/2006000008/21/20061100
Subject:
SGP/MWR/B5 - Mixer temp unstable
DataStreams:sgpmwrlosB5.b1, sgpmwrtipB5.a1
Description:
The radiometer mixer temperature was unstable during this time interval. The instability 
will slightly affect calibration.  On 8/21, the instrument was sent to the vendor for 
repair.

June and July data are suspect, the calibration may be slightly incorrect. August data 
should not be used.
Measurements:sgpmwrtipB5.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(tipsky31)
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • 23.8 GHz sky signal(tipsky23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)

sgpmwrlosB5.b1:
  • Mixer kinetic (physical) temperature(tkxc)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz sky signal(sky23)
  • MWR column precipitable water vapor(vap)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky signal(sky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)


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DQRID : D071011.4
Start DateStart TimeEnd DateEnd Time
09/02/2007150004/01/20080000
Subject:
SGP/MWR/B5 - Intermittent missing data
DataStreams:sgpmwrlosB5.b1, sgpmwrtipB5.a1
Description:
Starting on 9/2/07 data have been intermittent due to frequent software crash. Large 
chunks (several days in duration) of data are missing. In March 2008 the fiber optics 
connections were checked and several faulty points were identified. The connections were 
repaired. Since then the instances of software crashes are much reduced.
Measurements:sgpmwrtipB5.a1:
  • Actual Azimuth(actaz)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz Blackbody signal(bb23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(tipsky23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • lat(lat)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(tipsky31)
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mixer kinetic (physical) temperature(tkxc)
  • lon(lon)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • Actual elevation angle(actel)
  • Time offset of tweaks from base_time(time_offset)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • base time(base_time)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Dummy altitude for Zeb(alt)

sgpmwrlosB5.b1:
  • Mixer kinetic (physical) temperature(tkxc)
  • Ambient temperature(tkair)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Time offset of tweaks from base_time(time_offset)
  • Blackbody kinetic temperature(tkbb)
  • IR Brightness Temperature(ir_temp)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Averaged total liquid water along LOS path(liq)
  • lat(lat)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Dummy altitude for Zeb(alt)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • base time(base_time)
  • 23.8 GHz sky signal(sky23)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • lon(lon)
  • 31.4 GHz sky signal(sky31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)


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DQRID : D080410.3
Start DateStart TimeEnd DateEnd Time
03/18/2008060003/19/20080500
Subject:
SGP/MWR/B5 - Some rain events flagged
DataStreams:sgpmwrlosB5.b1, sgpmwrtipB5.a1
Description:
March 18 there was a strong rain event. During this time the brightness temperatures where 
> 100 K due to water accumulating on the radiometer, however the wet window flag 
indicator was not tripped.  Users should not rely on the wet window flag to screen 
rain-contaminated data.  Instead, apply a brightness temperature threshold of 100 K instead to both 
channels.
Measurements:sgpmwrtipB5.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)

sgpmwrlosB5.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Sky brightness temperature at 23.8 GHz(tbsky23)


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DQRID : D080724.1
Start DateStart TimeEnd DateEnd Time
03/28/1998195904/08/19981626
07/07/1998195907/15/19981823
07/18/1998190007/29/19981944
09/04/1998185909/09/19981848
12/15/1998215312/17/19981926
01/17/1999054901/19/19991829
06/23/1999142906/25/19991945
07/23/1999190007/27/19991537
07/27/1999175907/29/19992153
07/30/1999190008/01/19991453
09/11/1999061609/13/19991456
09/13/1999170009/15/19992130
09/17/1999130310/27/19991716
02/18/2000170002/21/20001522
09/01/2000200009/05/20001636
12/26/2000234301/02/20011713
01/12/2001190001/15/20011542
11/10/2001195711/12/20011629
01/27/2003141301/31/20031734
03/03/2003113003/05/20031904
06/14/2003222906/19/20031548
08/18/2003113108/20/20031700
10/08/2003070310/10/20031545
10/10/2003162410/15/20031622
10/15/2003170010/17/20031618
12/24/2003234112/26/20031741
02/16/2004113102/18/20041844
03/31/2004191705/07/20041703
09/13/2004113009/15/20041559
11/13/2004203211/15/20041757
11/24/2004183411/26/20041729
12/04/2004134412/06/20041846
12/25/2004182512/27/20041434
07/09/2005111407/11/20051313
10/24/2005104310/26/20051623
11/01/2005091111/09/20051946
11/10/2005035611/23/20051440
11/29/2005092412/06/20051749
12/06/2005210012/09/20051736
12/09/2005233312/12/20051429
08/21/2006180006/11/20071953
09/02/2007145109/07/20071540
09/14/2007154609/17/20071811
09/18/2007052509/26/20071320
10/05/2007033110/09/20071549
11/03/2007234511/05/20071620
11/10/2007000911/13/20071725
11/17/2007234511/19/20071411
11/21/2007190012/06/20072100
12/06/2007212012/13/20071836
01/19/2008102401/23/20081438
04/15/2008130404/17/20081312
04/19/2008011604/21/20081310
05/31/2008180906/04/20081915
10/03/2008084210/06/20081209
12/12/2008184712/15/20081441
04/03/2009092504/06/20091211
Subject:
SGP/MWR/B5 - Missing data
DataStreams:sgpmwrlosB5.b1
Description:
Data are missing and unrecoverable.
Measurements:sgpmwrlosB5.b1:
  • base time(base_time)
  • Mixer kinetic (physical) temperature(tkxc)
  • Ambient temperature(tkair)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Time offset of tweaks from base_time(time_offset)
  • 23.8 GHz sky signal(sky23)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • IR Brightness Temperature(ir_temp)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • lat(lat)
  • lon(lon)
  • 31.4 GHz sky signal(sky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • Dummy altitude for Zeb(alt)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)


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DQRID : D960129.2
Start DateStart TimeEnd DateEnd Time
01/13/1996000001/19/19962359
Subject:
SGP/MWR/B1/B5 - Calibration questionable
DataStreams:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1
Description:
At the present time, calibrations at B1 and B5 appear out of date.

SGP-B1 (Hillsboro, KS)
Precipitable vapor amounts occasionally negative - calibration needs to
be checked when sky becomes clear.  Data quality is questionable.

Precipitable vapor amounts about 0.6 cm less than integrated
soundings.


SGP-B5 (Morris, OK)
Data from this instrument are missing for 12-15 Jan.  Reason unknown.

Because precipitable vapor amount was negative during 7-8 Jan,
calibration is still suspect.  Liquid water path appears positive for
periods when sky is clear (positive bias).  Data quality is
questionable.

Precipitable vapor amounts 0.3-0.5 cm less than integrated soundings.
Measurements:sgpmwrlosB5.a1:
  • IR Brightness Temperature(ir_temp)
  • MWR column precipitable water vapor(vap)
  • Actual elevation angle(actel)
  • Actual Azimuth(actaz)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrlosB1.a1:
  • MWR column precipitable water vapor(vap)
  • Actual Azimuth(actaz)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Actual elevation angle(actel)
  • Averaged total liquid water along LOS path(liq)
  • IR Brightness Temperature(ir_temp)

sgpmwrlosB1.a0:
  • 31.4 GHz blackbody(31bb)
  • Which LOS configuration(losn)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky signal(31sky)
  • Actual Azimuth(actaz)
  • 23.8 GHz noise injection brightness temperature(23unoise)
  • 23.8 GHz Blackbody signal(23bb)
  • 31.4 GHz sky+noise injection signal(31skyn)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz sky+noise injection signal(23skyn)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 31.4 GHz noise injection brightness temperature(31unoise)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • Mixer kinetic (physical) temperature(tkxc)
  • Actual elevation angle(actel)
  • 23.8 GHz sky signal(23sky)
  • IR Brightness Temperature(ir_temp)

sgpmwrlosB5.a0:
  • 31.4 GHz sky signal(31sky)
  • 31.4 GHz noise injection brightness temperature(31unoise)
  • 23.8 GHz Blackbody signal(23bb)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky+noise injection signal(31skyn)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Mixer kinetic (physical) temperature(tkxc)
  • 31.4 GHz blackbody(31bb)
  • 23.8 GHz sky+noise injection signal(23skyn)
  • Actual Azimuth(actaz)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • IR Brightness Temperature(ir_temp)
  • Which LOS configuration(losn)
  • Blackbody kinetic temperature(tkbb)
  • MWR column precipitable water vapor(vap)
  • Actual elevation angle(actel)
  • 23.8 GHz noise injection brightness temperature(23unoise)
  • 23.8 GHz sky signal(23sky)


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DQRID : D960404.1
Start DateStart TimeEnd DateEnd Time
02/12/1994000004/04/19962359
Subject:
SGP/MWR/B1/B4/B5 - Reprocess: Error in MWR calibration
DataStreams:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0,
sgpmwrlosB5.a1
Description:
The effect of this error is small.  At most, it results in a bias of
about -0.015 cm in precipitable water vapor and -0.015 mm in liquid
water path during clear sky conditions.  The error is largest when the
brightness temperatures are small (i.e. clear skies and low PWV).

The error results from failing to correctly account for the effect of
the Teflon window covering the radiometer mirror.  Although the
contribution of the window is subtracted when the tip curve data are
reduced to determine the true zenith brightness temperature, it is not
added back in when the zenith brightness temperature is used to
calibrate the noise diode.  This would still not be a problem if the
contribution of the window where not subtracted (again) during zenith
line-of-sight (LOS) operations.  But it is and the net effect is to
subtract the contribution of the window twice.

The calibrations ('Noise Injection Temperatures') are off by a factor
of 1.00164 and 1.00217 for the 23.8 and 31.4 GHz frequencies,
respectively.

The magnitude of the error is equal to the emissivity of the window
multiplied by the difference between the brightness temperature and the
temperature of the window.  The latter is taken to be equal to the
temperature of the internal blackbody target (which is about 10 deg C
above ambient.)  The emissivity of the window is 0.00164 at 23.8 GHz
and 0.00217 at 31.4 GHz.  For a reference temperature of 292.6 K and
brightness temperatures of 32.3 and 20.8 K at 23.8 and 31.4 GHz
respectively, this amounts to errors of -0.43 and -0.59 K at the
respective frequencies.  The average PWV for this date (5 April 1995)
was 1.4 cm.

At higher levels of PWV and for cloudy conditions, the brightness
temperatures are higher and so the error is smaller.

I will adjust the calibrations of all SGP radiometers to account
for this problem by the end of tomorrow (4 April 1996).
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB4.a0:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB1.a0:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB5.a0:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB4.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)


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DQRID : D960404.2
Start DateStart TimeEnd DateEnd Time
02/12/1994000004/04/19962359
Subject:
SGP/MWR/B1/B4/B5 - Reprocess: MWR Tuning Functions
DataStreams:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0,
sgpmwrlosB5.a1
Description:
The 'tuning functions' used to adjust the equivalent brightness
temperatures (TBs) measured by the ARM microwave radiometers (MWRs) are
now believed to be both incorrect and unnecessary.  They should no longer
be used and the data (going back to 1992) that incorporated them should
be reprocessed.  By eliminating these tuning functions the radiometer
retrievals would be independent of the soundings.

BACKGROUND

A recent comparison by Barry Lesht (ANL) of the precipitable water
vapor (PWV) retrieved from the MWR-measured brightness temperatures
against PWV derived by integrating along the trajectory of radiosonde
ascents has revealed that the MWR values are about 90% of those derived
from the soundings.  This is directly attributable to the slope of the
tuning function for the vapor-sensing channel (23.8 GHz) of 0.915 which
is applied to the measured brightness temperatures prior to retrieval
of PWV.

The rationale behind the use of the tuning functions is that the
radiation model (Liebe 87), on which the retrieval is based, is
imperfect whereas the radiosondes represent 'ground truth.'  Thus the
observed brightness temperatures must be adjusted to match those
calculated with the model using co-located soundings so that the
retrieval yields precipitable vapor amounts that agree with the
soundings.

Tuning functions were developed for the present ARM MWRs using
co-located soundings launched between October 1992 and December 1993.
These were adjusted slightly in January 1995 to account for the effects
of the 1-point calibration check performed prior to launch (see DQR
P950110.1):

     23.8 GHz:  TB_model = 0.789 + 0.915 TB_measured  (R2 = 0.998)
     31.4 GHz:  TB_model = 1.142 + 0.910 TB_measured  (R2 = 0.984)

However, repeating this exercise for soundings launched during 1994 and
1995 (excepting those that were mis-calibrated by the manufacturer; see
D960229.1) it now appears that the model-calculated
brightness temperatures are in much closer agreement with the measured
values and that the tuning functions account more for variations in the
radiosonde calibration than for any deficiencies in the radiation
model.  

Consequently, it appears that the present tuning functions are
incorrect and bias the retrieved PWV low by 10%.  In addition, given
the present agreement between measured and modeled brightness
temperatures, the tuning functions are also unnecessary.

METHODOLOGY

Brightness temperatures measured with microwave radiometer (MWR) serial
number 10, which was deployed at the central facility in December 1993,
have been compared against calculations using measurements from the
co-located Balloon-Borne Sounding System (BBSS).  The results are
summarized in two tables.  In each table, the calibration dates of the
sondes and MWR are listed as well as the time period and number of
samples included in each regression.  Each MWR sample is a 40-minute
average, centered on the time of the sonde launch, of the microwave
brightness temperature.  In order to include only clear sky conditions,
samples for which the standard deviation of the liquid-sensing (31.4
GHz) channel exceeded 0.3 K were eliminated.  To assure that the water
vapor was reasonably homogeneous horizontally, samples for which the
standard deviation in the vapor-sensing (23.8 GHz) channel exceeded 0.4
K (in 1995) or 0.5 K (in 1994) were eliminated.  The 1994 threshold is
larger in order to increase the number of samples and reduce the
standard error in the results.

The microwave radiometer measurements used in this comparison have been
reprocessed to account for calibration changes and other problems (see
P940813.1)

                            TB vs PWV

The first table is a comparison of microwave brightness temperature
(TB_mwr) regressed against the precipitable water vapor (PWV) computed
by integrating along the trajectory of the radiosonde ascent.  The
sondes launched during May - December 1994 are compared against two
sets of MWR data; the first uses the May 1994 calibration, and the
second uses the calibration of July 1994.  A comparison is also made of
TB_model vs PWV ('Liebe87') for reference.

The intercepts indicate the contribution due to molecular oxygen (i.e.
the tail of the 60 GHz line) which is affected by temperature and
pressure.  Note that the 'Liebe87' intercepts vary seasonally as the
temperature changes.  Note also that the effect of MWR calibration
changes is most evident in the intercept: offsets of 1-2 K are
observed.  Because the MWR calibration values represent the slope of
the radiometer equation (see Appendix), the magnitude of the offset is
largest at 0 K (i.e. the intercept) and declines to zero at ambient
temperature (~290 K).

The slope of the regression is essentially unaffected by the MWR
calibration.  Variations in the slope of the regression correlate with
sonde calibration date.  The sondes calibrated in May 1994 or later
appear to yield much closer agreement between the measured brightness
temperatures and those calculated with the Liebe 87 model than those
calibrated in January 1994 or earlier, with which the present tuning
functions were developed.

TABLE 1.  Microwave brightness temperature vs. precipitable water vapor

Relationship:  TB_mwr (K) = intercept (K) + slope (K/cm) * PW_sonde (cm)
Standard Error of the intercepts and slopes are given in parentheses.

Date of   Date of  Period          ------ 23.8 GHz -----  ----- 31.4 GHz -----
Sonde Cal MWR tip  Covered    N    intercept   slope      intercept  slope

1991-93    92-93  Oct92-Dec93 91   6.7        14.7        8.1        5.3

1992,93   Dec 93  Jan-Feb 94  85   6.9(0.19)  15.8(0.26)  8.8(0.13)  5.6(0.17)
1992,93   Liebe87 Jan-Feb 94  85   6.5(0.02)  13.8(0.03)  8.9(0.07)  4.5(0.09)

 Jun 93   Dec 93      Apr 94  16  10.6(1.11)  14.8(0.55) 10.1(0.51)  5.6(0.25)
 Jun 93   Liebe87     Apr 94  16   6.9(0.05)  13.6(0.02)  8.1(0.09)  5.0(0.05)

1992,93   May 94  May-Jun 94  48   7.0(1.03)  14.9(0.45)  7.8(0.41)  5.7(0.17)
1992,93   Jul 94  May-Jun 94  48   5.1(1.03)  14.9(0.44)  6.6(0.39)  5.7(0.17)
1992,93   Liebe87 May-Jun 94  48   7.1(0.11)  13.5(0.05)  8.4(0.16)  4.9(0.07)

 Jan 94   Dec 93  Feb-May 94  95   7.6(0.27)  14.3(0.14)  8.5(0.15)  5.5(0.08)
 Jan 94   Liebe87 Feb-May 94  95   6.9(0.05)  13.6(0.02)  8.1(0.09)  5.0(0.05)

 May 94   May 94  Jun-Aug 94  78  12.3(1.04)  13.0(0.34) 11.0(0.39)  4.8(0.13)
 May 94   Jul 94  Jun-Aug 94  78  10.3(1.04)  13.1(0.34)  9.8(0.39)  4.8(0.13)
 May 94   Liebe87 Jun-Aug 94  78   7.8(0.22)  13.3(0.07)  8.6(0.29)  4.9(0.10)

 Jun 94   May 94  Jul-Dec 94  57   8.3(0.37)  13.6(0.21)  8.8(0.19)  5.2(0.11)
 Jun 94   Jul 94  Jul-Dec 94  57   6.4(0.37)  13.6(0.21)  7.7(0.18)  5.2(0.10)
 Jun 94   Liebe87 Jul-Dec 94  57   6.9(0.08)  13.5(0.04)  8.3(0.10)  4.9(0.06)

 Aug 94   May 94  Sep-Dec 94  90   7.4(0.15)  13.5(0.09)  8.8(0.11)  5.1(0.07)
 Aug 94   Jul 94  Sep-Dec 94  90   5.5(0.14)  13.6(0.09)  7.8(0.12)  5.0(0.07)
 Aug 94   Liebe87 Sep-Dec 94  90   6.8(0.05)  13.6(0.03)  8.6(0.09)  4.9(0.06)
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB4.a0:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB1.a0:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB5.a0:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB4.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)


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DQRID : D961117.6
Start DateStart TimeEnd DateEnd Time
07/01/1996183507/24/19960015
Subject:
Loss of thermal stabilization
DataStreams:sgpmwrlosB5.a1
Description:
DQR No:                               Platform: sgpmwrlos, sgp5mwravg, 
                                                sgpqmemwrlos

Subject: Loss of thermal stabilization

Date Submitted:
Submitted By:    JIM LILJEGREN        _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.

Platform/Measurement:
      What level data: a0,a1,c1

    What location was the data collected at: SGP B1 (Hillsboro, KS)
                                             SGP B4 (Vici, OK)
                                             SGP B5 (Morris, OK)
                                             SGP B6 (Purcell, OK)
                                             SGP C1 (Lamont, OK) 

    Period of time in question  (see table below)

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 _X_  incorrect                         _X_  Only some data fields affected:
 ___  wrong calibration
 ___  others                                 "23tbsky","31tbsky","vap","liq"
 
 Discussion of Problem:

I pointed out in a previous DQR (P960405.1) that during August of 1994
and 1995 the microwave radiometers would lose thermal stabilization on
very hot, sunny days when the temperature in the radiometer enclosure
rose above the set point for thermal stabilization (~50 deg C).  Although
I had planned to travel to the SGP prior to August 1996 to adjust the
set points upward to prevent this problem from occuring this year, the
temperatures in July 1996 were hotter than in previous years and the
loss of stabilization problem occurred before I could make the needed
adjustment.

The purpose of this note is the identify the time periods for which
this problem occurred.  More specific information about the problem,
including how the problem is detected and its effect on the reported
values of integrated water vapor and integrated cloud liquid water are
provided in the earlier DQR.

It is useful to repeat here that when the thermal stabilization is
lost, the reported precipitable water vapor increases and the liquid
water path decreases (and becomes SIGNIFICANTLY NEGATIVE (-0.1 mm) on
clear sky days).  The RMS noise level in the data also increases
sharply.  THESE ANOMALOUS VALUES HAVE BEEN INCLUDED IN THE 5-MINUTE
AVERAGES.

LOCATION                BEGINNING DATE AND TIME    ENDING DATE AND TIME

C1 (Central Facility)  
                         1 July 96  18:25 GMT      2 July 96  02:00 GMT
                         2          16:45          3          02:30
                         3          17:40          4          02:15
                         4          15:50          4          17:10
                         5          17:00          6          03:30
                         6          16:00          7          03:00
                         7          20:20          8          01:30
                        18          20:00         18          23:45
                        19          18:30         20          01:20
                        20          19:45         21          02:25
                        21          17:00         22          02:20
                        22          19:30         23          23:00

B1 (Hillsboro, KS)
                         1 July 96  20:30          2 July 96  01:15
                         2          17:00          3          02:00
                        17          20:30         18          00:15
                        18          19:25         19          02:00
                        19          19:00         20          02:30
                        20          18:35         21          00:30
                        21          20:20         22          01:40
                        28          20:55         28          00:15

B4 (Vici, OK)            2 July 96  19:25          2 July 96  23:15
                         3          19:35          3          21:15
                         4          20:40          5          00:30
                         5          19:15          6          02:00
                         6          19:00          6          22:40
                         7          20:45          8          00:30
                        21          19:45         22          02:00

B5 (Morris, OK)
                         1 July 96  18:35          2 July 96  00:45
                         2          17:20          3          01:15
                         3          17:25          4          02:00
                         5          20:20          6          01:45
                         6          16:45          7          02:30
                         7          18:10          8          01:00
                        19          20:00         20          00:20
                        20          19:30         21          00:55
                        21          18:15         22          01:30
                        22          19:30         23          01:15
                        23          22:00         24          00:15

B6 (Purcell, OK)

                         1 July 96  20:15          2 July 96  00:10
                         2          18:40          3          00:05
                         3          20:40          4          00:35
                         4          20:15          5          00:10
                         5          19:45          6          01:15
                         6          19:10          7          01:40
                        19          21:30         19          23:00
                        20          20:15         21          00:05
                        21          21:45         22          01:00
                        22          21:45         23          00:00

Other observations/measurements impacted by this problem:

none

Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

Flag with this comment.
Measurements:sgpmwrlosB5.a1:
  • Dummy altitude for Zeb(alt)
  • Actual elevation angle(actel)
  • IR Brightness Temperature(ir_temp)
  • Actual Azimuth(actaz)
  • lat(lat)
  • base time(base_time)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Time offset of tweaks from base_time(time_offset)
  • lon(lon)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Averaged total liquid water along LOS path(liq)


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DQRID : D961120.1
Start DateStart TimeEnd DateEnd Time
08/01/1996000008/31/19962359
Subject:
SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustment
DataStreams:sgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1,
sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1,
sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
In order to correct a thermal stabilization problem identified earlier
I adjusted the thermal set point of the microwave radiometers at the
SGP upward from 48-50 deg C to 55 deg C in early August 1996 according
to the schedule given below.

B6    5 August 1996
C1    6 August 1996
B1    7 August 1996
B5    8 August 1996

Subsequent to making this adjustment the MWRs were put in TIP mode to
check on whether the change in set point temperature affected their
calibration.  Because clear sky conditions were quite intermittent, it
is difficult to determine whether the substantial variability in the
tip data were attributable to the change in thermal set point.  The
instrument calibration was not altered in August.

Tip data were again collected with these instruments in September prior
to the beginning and at the close of the Water Vapor IOP.  For example,
the calibration of the instrument at the central facility (S/N 10)
derived from the September data was essentially the same as that
derived from calibration data acquired in February 1996.  Although this
would lead one to believe that altering the thermal set point did not
affect the instrument calibration, it may be that some transient effect
was induced.

In comparing soundings launched from the central facility with the
microwave radiometer there, I noticed that those sondes calibrated in
June 1996 consistently reported lower integrated water vapor than the
radiometer in July and September (during the IOP) but were in better
agreement with the radiometer for the two weeks period immediately
after the set point was adjusted.  I suspect that adjusting the thermal
set point may have temporarily increased the radiometer gain
(kelvins/volt) thereby lowering the measured brightness temperature and
the retrieved integrated water vapor.

It is not clear why a temporary change in gain should occur or even
whether it did.  But users of the data should be aware that the data
from the microwave radiometers at the SGP may be anomalous during
August 1996.
Measurements:sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgp5mwravgC1.c1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • MWR column precipitable water vapor(vap)

sgp5mwravgB6.c1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB4.a0:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosB6.a0:
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)

sgpmwrlosB1.a0:
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgp1mwravgC1.c1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosC1.a1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB4.a1:
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB1.a1:
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)

sgp5mwravgB1.c1:
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)

sgp5mwravgB5.c1:
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB5.a0:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • MWR column precipitable water vapor(vap)

sgp5mwravgB4.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosB6.a1:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)


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DQRID : D980205.2
Start DateStart TimeEnd DateEnd Time
10/27/1997200011/10/19971940
Subject:
Manually corrected error in header files
DataStreams:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
Description:
On 10/27/97 at 20:00 UTC, an error was made while remotely editing the
MWR configuration file.
This produced an error in the data file header which made the normal
processing programs fail. The problem was identified on 11/10/97.
The configuration file at BF1 was corrected on 11/11/97 at 19:40.
MWR.BBF5 wasremoved from service on
11/5/97 17:54. The configuration file at BF5 was corrected prior to 
reinstalling the MWR on 1/9/98.

The file headers of these data were reconstructed and the
data were delivered to the Archive on 11/26/97 for MWR.BF1
and on 12/3/97 for MWR.BF5.

This DQR is being filed to note that the headers were manually
recreated. The data should be unaffected.

This DQR is based on information obtained from Victor Morris
and Robin Perez.
Measurements:sgpmwrtipB5.a0:
  • lat(lat)
  • 23.8 GHz noise diode calib adjusted to tknd_nom and low_pass filltered(23expave)
  • 31.4 GHz sky signal+noise injection signal(31tipskynd)
  • lon(lon)
  • 31.4 GHz noise diode calib adjusted to tknd_nom and low_pass filltered(31expave)
  • 23.8 GHz Blackbody signal(23bb)
  • Actual elevation angle(actel)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz sky signal(31tipsky)
  • 31.4 GHz blackbody signal(31tipbb)
  • base time(base_time)
  • Dummy altitude for Zeb(alt)
  • 31.4 GHz calibration curve offset(31tbzenith)
  • 31.4 GHz calibration curve slope(31gain)
  • 31.4 GHz noise diode calib (injection temp) at Tkxc(31ndiode)
  • 23.8 GHz sky signal+noise injection signal(23tipskynd)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(23r)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz blackbody signal(23tipbb)
  • IR Brightness Temperature(ir_temp)
  • Blackbody temperature 1(tkbb1)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • Actual Azimuth(actaz)
  • Blackbody temperature 2(tkbb2)
  • Airmass value(airm)
  • 23.8 GHz sky signal(23tipsky)
  • 23.8 GHz calibration curve offset(23tbzenith)
  • 23.8 GHz calibration curve slope(23gain)
  • 31.4 GHz goodness-of-fit coefficient(31r)
  • Tip configuration number(tipn)
  • 23.8 GHz noise diode calib (injection temp) at Tkxc(23ndiode)
  • 31.4 GHz blackbody(31bb)

sgpmwrlosB5.a1:
  • Time offset of tweaks from base_time(time_offset)
  • Actual Azimuth(actaz)
  • base time(base_time)
  • Averaged total liquid water along LOS path(liq)
  • lat(lat)
  • lon(lon)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • IR Brightness Temperature(ir_temp)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • Dummy altitude for Zeb(alt)
  • Actual elevation angle(actel)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosB1.a1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Actual elevation angle(actel)
  • Averaged total liquid water along LOS path(liq)
  • base time(base_time)
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Actual Azimuth(actaz)
  • Dummy altitude for Zeb(alt)
  • lat(lat)
  • lon(lon)

sgpmwrlosB1.a0:
  • 31.4 GHz blackbody(31bb)
  • Averaged total liquid water along LOS path(liq)
  • Time offset of tweaks from base_time(time_offset)
  • base time(base_time)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Actual Azimuth(actaz)
  • 23.8 GHz noise injection brightness temperature(23unoise)
  • 23.8 GHz Blackbody signal(23bb)
  • 31.4 GHz sky+noise injection signal(31skyn)
  • 23.8 GHz sky+noise injection signal(23skyn)
  • Blackbody kinetic temperature(tkbb)
  • Dummy altitude for Zeb(alt)
  • 31.4 GHz noise injection brightness temperature(31unoise)
  • lat(lat)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • Mixer kinetic (physical) temperature(tkxc)
  • Actual elevation angle(actel)
  • 23.8 GHz sky signal(23sky)
  • lon(lon)
  • IR Brightness Temperature(ir_temp)
  • Which LOS configuration(losn)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky signal(31sky)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 31.4 GHz blackbody+noise injection signal(31bbn)

sgpmwrlosB5.a0:
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 31.4 GHz blackbody(31bb)
  • base time(base_time)
  • Time offset of tweaks from base_time(time_offset)
  • Actual Azimuth(actaz)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • IR Brightness Temperature(ir_temp)
  • MWR column precipitable water vapor(vap)
  • Actual elevation angle(actel)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz sky signal(23sky)
  • 31.4 GHz sky signal(31sky)
  • 31.4 GHz noise injection brightness temperature(31unoise)
  • 23.8 GHz Blackbody signal(23bb)
  • lat(lat)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky+noise injection signal(31skyn)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz sky+noise injection signal(23skyn)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • Dummy altitude for Zeb(alt)
  • Which LOS configuration(losn)
  • Blackbody kinetic temperature(tkbb)
  • lon(lon)
  • 23.8 GHz noise injection brightness temperature(23unoise)


Back To Table of Contents

DQRID : D980209.3
Start DateStart TimeEnd DateEnd Time
01/09/1998175702/09/19981659
Subject:
SGP/MWR/B5 - Reprocess: Calibration update
DataStreams:sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
Description:
With the MWR at Morris, there appears to be a very large (~0.5mm) positive bias in the LWP 
and the PWV values are much larger (~4cm) than reported by the soundings. Recent repairs 
by the manufacturer appear to have significantly changed the calibration.

The tip data acquired during the SCM IOP on 29-30 January at Morris have been reduced. It 
was updated at 17:00 on 9 February. The calibration will be closely monitored to 
determine if the previouly-reported (P971104.1) drift in the 31.4 GHz channel has been corrected.

The table below compares the latest calibration with previous ones.

                                   23.8 GHz                  31.4 GHz
                              ----------------------- -----------------------
Date    Location    Tips      Tnd(K) tc(K/K) err(K)   Tnd(K) tc(K/K) err(K)
Jun 97  B5/Morris   2566      168.85  -0.071  0.33    186.15  -0.005  0.24
Aug 97  B5/Morris   1229      169.97  -0.103  0.31    188.45  -0.029  0.19
Nov 97  B5/Morris   3420      169.17  -0.082  0.24    188.76  +0.003  0.20
Jan 98  B5/Morris   2340      218.64  -0.107  0.23    219.41  +0.007  0.18

The data collected since the instrument was reinstalled on 9 January until the calibration 
was updated will need to be reprocessed.
Measurements:sgpmwrlosB5.a1:
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • MWR column precipitable water vapor(vap)
  • Dummy altitude for Zeb(alt)
  • Actual elevation angle(actel)
  • Actual Azimuth(actaz)
  • base time(base_time)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • lat(lat)
  • lon(lon)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrtipB5.a0:
  • 31.4 GHz noise diode calib (injection temp) at Tkxc(31ndiode)
  • 23.8 GHz sky signal+noise injection signal(23tipskynd)
  • lat(lat)
  • 23.8 GHz noise diode calib adjusted to tknd_nom and low_pass filltered(23expave)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • 31.4 GHz sky signal+noise injection signal(31tipskynd)
  • lon(lon)
  • 31.4 GHz noise diode calib adjusted to tknd_nom and low_pass filltered(31expave)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(23r)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz blackbody signal(23tipbb)
  • 23.8 GHz Blackbody signal(23bb)
  • IR Brightness Temperature(ir_temp)
  • Blackbody temperature 1(tkbb1)
  • Actual elevation angle(actel)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • Actual Azimuth(actaz)
  • Blackbody temperature 2(tkbb2)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)
  • Airmass value(airm)
  • 31.4 GHz blackbody signal(31tipbb)
  • base time(base_time)
  • Dummy altitude for Zeb(alt)
  • 23.8 GHz calibration curve offset(23tbzenith)
  • 31.4 GHz calibration curve offset(31tbzenith)
  • 31.4 GHz calibration curve slope(31gain)
  • 23.8 GHz calibration curve slope(23gain)
  • 31.4 GHz goodness-of-fit coefficient(31r)
  • Tip configuration number(tipn)
  • 23.8 GHz noise diode calib (injection temp) at Tkxc(23ndiode)
  • 31.4 GHz blackbody(31bb)

sgpmwrlosB5.a0:
  • 31.4 GHz sky signal(31sky)
  • 31.4 GHz noise injection brightness temperature(31unoise)
  • 23.8 GHz Blackbody signal(23bb)
  • lat(lat)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky+noise injection signal(31skyn)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Mixer kinetic (physical) temperature(tkxc)
  • 31.4 GHz blackbody(31bb)
  • base time(base_time)
  • 23.8 GHz sky+noise injection signal(23skyn)
  • Time offset of tweaks from base_time(time_offset)
  • Actual Azimuth(actaz)
  • 31.4 GHz blackbody+noise injection signal(31bbn)
  • Dummy altitude for Zeb(alt)
  • IR Brightness Temperature(ir_temp)
  • 23.8 GHz blackbody+noise injection signal(23bbn)
  • Which LOS configuration(losn)
  • Blackbody kinetic temperature(tkbb)
  • MWR column precipitable water vapor(vap)
  • lon(lon)
  • Actual elevation angle(actel)
  • 23.8 GHz noise injection brightness temperature(23unoise)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz sky signal(23sky)


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DQRID : D980211.1
Start DateStart TimeEnd DateEnd Time
01/16/1998190702/10/19982359
Subject:
SGP/MWR/B5 - Incorrect serial number
DataStreams:sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0
Description:
The MWR serial number was changed from 012 to 001 in the configuration file while the 
instrument was off line for repairs and testing. This resulted in an incorrect serial number 
used in the filename extension of the raw data file and placed in the header of the cdf 
file. Data quality were not affected.
Measurements:sgpmwrtipB5.a0:
  • base time(base_time)

sgpmwrlosB5.a1:
  • base time(base_time)

sgpmwrlosB5.a0:
  • base time(base_time)


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DQRID : D990106.2
Start DateStart TimeEnd DateEnd Time
02/12/1994000002/10/19982359
Subject:
SGP/MWR/B5 - Software Change
DataStreams:sgpmwrlosB5.a1
Description:
The MWR operating software was changed on 12 February 1998 to provide additional 
functionality as described below. This change affects the format of the raw and ingested data. 
   
NEW FEATURES
1. Faster sampling rate
   
Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 
20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per 
blackbody sample and gain update.)
   
2. More flexible sampling strategy
   
Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. 
This permits sky samples to be acquired at intervals of 2.67 seconds for improved 
temporal resolution of cloud liquid water variations and better coordination with the millimeter 
cloud radar during IOPs.
   
3. Separation of zenith LOS observations from TIP data
   
When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV 
and LWP computed and reported separately in the output file. This eliminates the periods 
of missing LOS data during calibration checks/updates.
   
4. Automatic self-calibration
   
The software now permits the calibration to be updated at specified intervals or 
continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified 
intervals or whenever clear sky conditions occur, the tip data reduced, the calibration 
updated, and the radiometer returned to LOS mode without operator intervention. In the 
second case, the radiometer is continuously is TIP mode until changed by the operator.
   
5. Graphical user display
   
The graphical display is comprised of a status display, a message display, a temperature 
plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip 
curves.
Measurements:sgpmwrlosB5.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)


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DQRID : D990113.1
Start DateStart TimeEnd DateEnd Time
07/21/1993140601/12/19992359
Subject:
SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0
Description:
At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made 
operational at the SGP central facility (C1).  No problems were noted over the next few 
days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 
January.  This version includes a beam width correction I developed as well as providing the 
capability to automatically level the elevation mirror (that is, to automatically detect 
and correct offsets in the elevation angle stepper motor position.)

On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not 
executing the system command to move and rename the data files so that the ARM data system 
could retrieve them.  Reducing the length of the storage arrays in the auto-leveling 
feature from 1000 to 250 resolved the problem.  This results in the auto-leveling being based 
on only 4 hours of clear sky data rather than 16 hours at B5 and C1.  This version of the 
program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these 
computers are upgraded to Pentium-class machines.

The improvement in the quality of the tip curves resulting from the auto-leveling has been 
dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 
degrees) have been reduced from +/- 5 K to +/- 0.5 K.  The goodness-of-fit coefficient for 
the tip curves has improved from about 0.995 to over 0.998.  In order to take full 
advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the 
goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998.

Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all 
time.  The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, 
but the data prior to that range did not have these corrections applied.
Measurements:sgpmwrtipB1.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosB5.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrtipB5.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosB1.a1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)

sgpmwrtipB6.a0:
  • 23.8 GHz sky signal(23tipsky)
  • 31.4 GHz sky signal(31tipsky)

sgpmwrtipB4.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosC1.a1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB4.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB6.a1:
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)


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DQRID : D990916.1
Start DateStart TimeEnd DateEnd Time
10/29/1998000008/12/19992359
Subject:
SGP/MWR/B1/B4/B5/B6 - data file split at 23:59
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosB5.a1,
sgpmwrlosB5.b1, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB1.a1, sgpmwrtipB4.a1, sgpmwrtipB5.a1,
sgpmwrtipB6.a1
Description:
A problem with the MWR operating software has been corrected.  However, several files were 
generated that contain one record of data collected at midnight but labeled with the 
previous day's date.
Measurements:sgpmwrlosB5.a1:
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Time offset of tweaks from base_time(time_offset)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • (tknd)
  • IR Brightness Temperature(ir_temp)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Ambient temperature(tkair)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz blackbody(bb31)
  • 23.8 GHz sky signal(sky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • base time(base_time)
  • 23.8 GHz Blackbody signal(bb23)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(sky31)
  • Averaged total liquid water along LOS path(liq)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)

sgpmwrlosB1.a1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • (tknd)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blackbody(bb31)
  • 23.8 GHz sky signal(sky23)
  • Ambient temperature(tkair)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • MWR column precipitable water vapor(vap)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • base time(base_time)
  • IR Brightness Temperature(ir_temp)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz sky signal(sky31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)

sgpmwrtipB6.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 31.4 GHz sky signal(tipsky31)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Actual Azimuth(actaz)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • (tknd)
  • 23.8 GHz Blackbody signal(bb23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Ambient temperature(tkair)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • base time(base_time)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 23.8 GHz sky signal(tipsky23)
  • Actual elevation angle(actel)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)

sgpmwrlosB6.b1:
  • 23.8 GHz Blackbody signal(bb23)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz blackbody(bb31)
  • 31.4 GHz sky signal(sky31)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • IR Brightness Temperature(ir_temp)
  • base time(base_time)
  • 23.8 GHz sky signal(sky23)
  • Time offset of tweaks from base_time(time_offset)
  • Mixer kinetic (physical) temperature(tkxc)
  • (tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Ambient temperature(tkair)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)

sgpmwrlosB4.b1:
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • MWR column precipitable water vapor(vap)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz blackbody(bb31)
  • (tknd)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Blackbody kinetic temperature(tkbb)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(sky31)
  • 23.8 GHz Blackbody signal(bb23)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(sky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • IR Brightness Temperature(ir_temp)
  • base time(base_time)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)

sgpmwrtipB4.a1:
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Time offset of tweaks from base_time(time_offset)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Actual elevation angle(actel)
  • 31.4 GHz blackbody(bb31)
  • base time(base_time)
  • Mixer kinetic (physical) temperature(tkxc)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • (tknd)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Actual Azimuth(actaz)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 23.8 GHz Blackbody signal(bb23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)

sgpmwrtipB5.a1:
  • 23.8 GHz Blackbody signal(bb23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz blackbody(bb31)
  • Time offset of tweaks from base_time(time_offset)
  • Actual Azimuth(actaz)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Actual elevation angle(actel)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz sky signal(tipsky23)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • base time(base_time)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 31.4 GHz blac2body+noise injection signal(bbn31)

sgpmwrlosB1.b1:
  • Ambient temperature(tkair)
  • IR Brightness Temperature(ir_temp)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 31.4 GHz blackbody(bb31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky signal(sky31)
  • Time offset of tweaks from base_time(time_offset)
  • base time(base_time)
  • 23.8 GHz sky signal(sky23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Averaged total liquid water along LOS path(liq)
  • (tknd)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz Blackbody signal(bb23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • MWR column precipitable water vapor(vap)

sgpmwrtipB1.a1:
  • Actual elevation angle(actel)
  • 31.4 GHz blackbody(bb31)
  • Actual Azimuth(actaz)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 23.8 GHz Blackbody signal(bb23)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz sky signal(tipsky23)
  • Time offset of tweaks from base_time(time_offset)
  • (tknd)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Ambient temperature(tkair)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • base time(base_time)

sgpmwrlosB4.a1:
  • IR Brightness Temperature(ir_temp)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Ambient temperature(tkair)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Time offset of tweaks from base_time(time_offset)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 23.8 GHz sky signal(sky23)
  • MWR column precipitable water vapor(vap)
  • base time(base_time)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz sky signal(sky31)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • (tknd)
  • 23.8 GHz Blackbody signal(bb23)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)

sgpmwrlosB5.b1:
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Time offset of tweaks from base_time(time_offset)
  • IR Brightness Temperature(ir_temp)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • base time(base_time)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Ambient temperature(tkair)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz sky signal(sky31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Blackbody kinetic temperature(tkbb)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz blackbody(bb31)
  • (tknd)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • 23.8 GHz Blackbody signal(bb23)

sgpmwrlosB6.a1:
  • IR Brightness Temperature(ir_temp)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Ambient temperature(tkair)
  • 23.8 GHz Blackbody signal(bb23)
  • Time offset of tweaks from base_time(time_offset)
  • Blackbody kinetic temperature(tkbb)
  • base time(base_time)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • 31.4 GHz blackbody(bb31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 23.8 GHz sky signal(sky23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • (tknd)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 31.4 GHz sky signal(sky31)


Back To Table of Contents



END OF DATA