Data Quality Reports for Session: 127536 User: zhe1feng Completed: 05/04/2010

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000606.1SGP/MWR/C1 - IRT removedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D001122.1SGP/MWR/C1 - calibration checkssgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D001205.1SGP/MWR/C1 - Time driftsgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D010215.5SGP/MWR/C1 - IRT failuresgpmwrlosC1.a1, sgpmwrlosC1.b1
D030214.1SGP/MWR/B4/C1 - LOS cycle skippingsgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D030312.10SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperaturessgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D030822.1SGP/MWR/C1 - Incorrect min and max valuessgpmwrlosC1.b1
D030902.1SGP/MWR/C1 - no air temperature signalsgpmwrlosC1.b1, sgpmwrtipC1.a1
D040824.1SGP/MWR/C1 - Wet window flag "on" more frequently than expectedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D041001.3SGP/MWR/C1 - Instrument problemsgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D041014.1SGP/MWR/C1 - thermal instabilitysgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D041117.2SGP/MWR/C1 - Reprocess: wrong retrievalssgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1
D050203.3SGP/MWR/C1 - spare instrumentsgpmwrlosC1.b1, sgpmwrtipC1.a1
D050722.1SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficientssgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1,
sgpqmemwrcolC1.c1
D050915.1SGP/MWR/C1 - Instrument noise problemsgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D051011.6SGP/MWR/C1 - New software version (4.15) installedsgpmwrlosC1.b1, sgpmwrtipC1.a1
D060717.2SGP/MWR/C1 - Spikes in ambient temperature readingssgpmwrlosC1.b1, sgpmwrtipC1.a1
D070314.2SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flagsgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1
D070802.3SGP/MWR/C1 - Noisy datasgpmwrlosC1.b1, sgpmwrtipC1.a1
D071128.2SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocesssgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D080103.2SGP/MWR/C1 - Missing datasgpmwrlosC1.b1
D081013.5SGP/MWR/C1 - Increased noise in 31.4 GHz channelsgpmwrlosC1.b1, sgpmwrtipC1.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


DQRID : D000606.1
Start DateStart TimeEnd DateEnd Time
10/19/1999223011/17/19992025
Subject:
SGP/MWR/C1 - IRT removed
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
There were no IRT data during this period because MWR #10, upon
which the IRT is mounted, was returned to the vendor for upgrades and
replaced with spare MWR #33 which does not have the mounting hardware
or the electronics to accept the IRT.
Measurements:sgpmwrlosC1.a1:
  • Sky Infra-Red Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D001122.1
Start DateStart TimeEnd DateEnd Time
02/16/2000221002/16/20002250
09/21/2000142309/21/20001434
09/21/2000150609/21/20001517
09/26/2000142609/26/20001434
10/02/2000173210/02/20001752
10/02/2000205210/02/20002107
10/03/2000140610/03/20001421
09/06/2001190009/06/20012000
Subject:
SGP/MWR/C1 - calibration checks
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
The MWR calibration was checked by a cryogenic (liquid nitrogen) 
blackbody target or (in the case of the Sept 2001 time period)
by pointing the mirror at an internal blackbody target.  The 
brightness temperatures and vap and liq retrievals are not
representative of the sky/atmosphere.
Measurements:sgpmwrtipC1.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)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

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DQRID : D001205.1
Start DateStart TimeEnd DateEnd Time
05/05/2000195509/18/20002145
Subject:
SGP/MWR/C1 - Time drift
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
On 9/18/00, I found that the time on the MWR laptop was 1m 21s slow. The Dimension4 
utility had last synchronized the time on 5/5/00. Found that the network DNS settings had been 
disabled. Added the DNS entry for ntp host CF10. Dimension4 synchronized the clock by 
adding 80.91s. The time had drifted at a rate of -0.59s/day.
Measurements:sgpmwrtipC1.a1:
  • Time offset of tweaks from base_time(time_offset)
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 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)
  • Ambient temperature(tkair)
  • Actual Azimuth(actaz)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Actual elevation angle(actel)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • (tknd)
  • Blackbody kinetic temperature(tkbb)
  • Mixer kinetic (physical) temperature(tkxc)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • base time(base_time)
  • 31.4 GHz blackbody(bb31)
sgpmwrlosC1.a1:
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Time offset of tweaks from base_time(time_offset)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky signal(sky31)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz sky signal(sky23)
  • 31.4 GHz blackbody(bb31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • base time(base_time)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • base time(base_time)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D010215.5
Start DateStart TimeEnd DateEnd Time
10/17/2000000001/24/20011600
Subject:
SGP/MWR/C1 - IRT failure
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The IRT was damaged by internal moisture causing sky temperature
measurements that are negatively biased compared to those from
the AERI. IRT#0517 was returned to the manufacturer for repair
and was replaced with spare IRT#1254.
Measurements:sgpmwrlosC1.a1:
  • Sky Infra-Red Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D030214.1
Start DateStart TimeEnd DateEnd Time
07/31/2002203411/05/20021815
Subject:
SGP/MWR/B4/C1 - LOS cycle skipping
DataStreams:sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
When MWR software version 4.12 was installed at the SGP, it was observed 
that the MWRs at CF and BF4 skip line-of-sight (LOS) observing cycles. In LOS mode, the 
software begins an observing cycle at 0, 20, and 40 seconds after the minute to provide 3 
LOS cycles per minute. If a cycle is delayed so that it takes more than 20 seconds to 
complete, then the next start time is missed, the cycle is skipped, and the data that would 
have been acquired are lost.  

It was demonstrated that the interaction with the IRT at CF slowed the MWR observing cycle 
noticeably and contributed significantly to the LOS cycle skipping. The IRT was removed 
from the MWR on 5 November 2002 and the LOS cycle skipping at the CF was resolved.  The 
IRT data are now available in a new separate datastream: sgpirtC1.a1 (and soon 
sgpirt2sC1.a1).

The BF4 cycle skipping may have resulted from a combination of an additional air 
temperature sensor on this instrument and the use of a fiber optic cable.  However, the cycle 
skipping on this instrument appears to have abated without modifications to the instrument 
configuration.
Measurements:sgpmwrlosB4.b1:
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Ambient temperature(tkair)
  • (tknd)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz sky signal(sky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz sky signal(sky31)
  • Mixer kinetic (physical) temperature(tkxc)
  • MWR column precipitable water vapor(vap)
  • Blackbody kinetic temperature(tkbb)
sgpmwrlosC1.a1:
  • (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky signal(sky31)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz sky signal(sky23)
  • 31.4 GHz blackbody(bb31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Sky Infra-Red Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky Infra-Red Temperature(sky_ir_temp)
sgpmwrlosB4.a1:
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Blackbody kinetic temperature(tkbb)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 31.4 GHz sky signal(sky31)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • (tknd)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 31.4 GHz blackbody(bb31)
  • Averaged total liquid water along LOS path(liq)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 23.8 GHz sky signal(sky23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)

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DQRID : D030312.10
Start DateStart TimeEnd DateEnd Time
11/17/1999180007/31/20022034
Subject:
SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures
DataStreams:sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.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:sgp5mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgp1mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

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DQRID : D030822.1
Start DateStart TimeEnd DateEnd Time
04/18/2002000002/10/20032359
Subject:
SGP/MWR/C1 - Incorrect min and max values
DataStreams:sgpmwrlosC1.b1
Description:
The values of valid_min and valid_max applied to fields tkxc and tknd were incorrect. They 
should be 303 and 333, respectively.
Measurements:sgpmwrlosC1.b1:
  • (tknd)
  • Mixer kinetic (physical) temperature(tkxc)

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DQRID : D030902.1
Start DateStart TimeEnd DateEnd Time
08/22/2003211509/30/20041835
Subject:
SGP/MWR/C1 - no air temperature signal
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air 
temperature sensor failed to properly report. It was determined that the wires carrying the 
signal to the analog board did not conform to the standard expected by the upgraded blower. 
The problem was corrected by changing the wiring.
Measurements:sgpmwrtipC1.a1:
  • Ambient temperature(tkair)
sgpmwrlosC1.b1:
  • Ambient temperature(tkair)

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DQRID : D040824.1
Start DateStart TimeEnd DateEnd Time
12/01/1999000012/21/19992359
11/10/2000000012/08/20002359
01/26/2001000003/05/20012359
12/18/2001000012/31/20012359
02/11/2002000002/28/20022359
02/19/2003000003/26/20032359
10/15/2003000011/03/20032359
Subject:
SGP/MWR/C1 - Wet window flag "on" more frequently than expected
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The wet window flag was set "on" more frequently than expected during the time periods 
specified.  This indicates the heater has been running more than necessary.  In most 
instances the moisture sensitivity was adjusted at the end of these periods.
Measurements:sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

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DQRID : D041001.3
Start DateStart TimeEnd DateEnd Time
09/21/2004211409/24/20041354
09/26/2004233209/27/20040317
09/27/2004121409/30/20041820
Subject:
SGP/MWR/C1 - Instrument problem
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
The MWR mixer temperature, blackbody temperature, and moisture flag are incorrect. This 
began when the instrument was returned to service after the analog board was temporarily 
removed to check the presence and absence of certain resistors. The board must have been 
accidently damaged during this process.
Measurements:sgpmwrtipC1.a1:
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • (tknd)
  • Blackbody kinetic temperature(tkbb)
  • Mixer kinetic (physical) temperature(tkxc)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
sgpmwrlosC1.a1:
  • (tknd)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
sgpmwrlosC1.b1:
  • Mixer kinetic (physical) temperature(tkxc)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Ambient temperature(tkair)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)

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DQRID : D041014.1
Start DateStart TimeEnd DateEnd Time
09/30/2004183510/13/20042118
Subject:
SGP/MWR/C1 - thermal instability
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
The analog board was replaced with a spare (D041001.3) with a reference temperature that 
was set too low (306 K) so that during periods of high ambient temperature, the instrument 
became thermally unstable. The problem was corrected when the temperature setting was 
increased (to 311 K).
Measurements:sgpmwrtipC1.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)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

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DQRID : D041117.2
Start DateStart TimeEnd DateEnd Time
09/21/2004164311/11/20042100
Subject:
SGP/MWR/C1 - Reprocess: wrong retrievals
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.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 CF1 were applied when the configuration file was updated.
Measurements:sgpmwrtipC1.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)
sgpqmemwrcolC1.c1:
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosC1.b1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

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DQRID : D050203.3
Start DateStart TimeEnd DateEnd Time
05/20/2003155808/22/20032059
Subject:
SGP/MWR/C1 - spare instrument
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
The spare MWR, S.N. 04, was installed while the production instrument, S.N. 10, was 
returned to the manufacturer for upgrades.
Measurements:sgpmwrtipC1.a1:
  • Time offset of tweaks from base_time(time_offset)
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 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)
  • Ambient temperature(tkair)
  • lon(lon)
  • Actual Azimuth(actaz)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • lat(lat)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Actual elevation angle(actel)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Mixer kinetic (physical) temperature(tkxc)
  • (tknd)
  • Blackbody kinetic temperature(tkbb)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Dummy altitude for Zeb(alt)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • base time(base_time)
  • 31.4 GHz blackbody(bb31)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • lon(lon)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • base time(base_time)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • lat(lat)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Dummy altitude for Zeb(alt)

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DQRID : D050722.1
Start DateStart TimeEnd DateEnd Time
04/16/2002200006/28/20052300
Subject:
SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients
DataStreams:sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1,
sgpqmemwrcolC1.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 as follows (BCR 456):
SGP/C1 (Lamont)     4/16/2002, 2000
SGP/B1 (Hillsboro)  4/12/2002, 1600
SGP/B4 (Vici)       4/15/2002, 2300
SGP/B5 (Morris)     4/15/2002, 2300
SGP/B6 (Purcell)    4/16/2002, 2200
SGP/E14(Lamont)     4/16/2002, 0000
NSA/C1 (Barrow)     4/25/2002, 1900 
NSA/C2 (Atqasuk)    4/18/2002, 1700
TWP/C1 (Manus)      5/04/2002, 0200
TWP/C2 (Nauru)      4/27/2002, 0600
TWP/C3 (Darwin)     inception

The MONORTM-based retrieval coefficients became active as follows (BCR 984):

SGP/C1 (Lamont)     6/28/2005, 2300
SGP/B1 (Hillsboro)  6/24/2005, 2100
SGP/B4 (Vici)       6/24/2005, 2100
SGP/B5 (Morris)     6/24/2005, 2100
SGP/B6 (Purcell)    6/24/2005, 1942
SGP/E14(Lamont)     6/28/2005, 2300
NSA/C1 (Barrow)     6/29/2005, 0000 
NSA/C2 (Atqasuk)    6/29/2005, 0000
TWP/C1 (Manus)      6/30/2005, 2100
TWP/C2 (Nauru)      6/30/2005, 2100
TWP/C3 (Darwin)     6/30/2005, 2100
PYE/M1 (Pt. Reyes)  4/08/2005, 1900**

** At Pt. Reyes, the original retrieval coefficients implemented in March 2005 were based 
on a version of the Rosenkranz model that had been modified to use the HITRAN half-width 
at 22 GHz and to be consistent with the water vapor continuum in MONORTM.  These 
retrievals yield nearly identical results to the MONORTM retrievals.  Therefore the Pt. Reyes 
data prior to 4/08/2005 may not require reprocessing.
Measurements:sgp5mwravgC1.c1:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
sgpmwrtipC1.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)
sgpqmemwrcolC1.c1:
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
sgp1mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosC1.b1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

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DQRID : D050915.1
Start DateStart TimeEnd DateEnd Time
07/28/2005140008/05/20051700
Subject:
SGP/MWR/C1 - Instrument noise problem
DataStreams:sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
Various variables including the mixer temperatures were very noisy. After several attempts 
to fix the problem, the instrument was taken off line and returned to the manufacturer 
for repair.
Measurements:sgp5mwravgC1.c1:
  • Standard deviation about the mean for the total water vapor amount(vap_sdev)
  • IR Brightness Temperature(ir_temp)
  • Number of data points averaged out of 15(number_obs_averaged)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Standard deviation about the mean for the total liquid water amount(liq_sdev)
  • Probability of slope change in ratio of averaged brightness temps(prob_slope_change)
  • Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
  • Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
  • Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
  • Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
  • MWR column precipitable water vapor(vap)
  • Probability of outlier in ratio of averaged brightness temps(prob_outlier)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Flag indicating where the initial surface water measurements are from: 0-> SMOS,
    1-> AERI(water_flag)
  • Probability of level change in ratio of averaged brightness temps(prob_level_change)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
sgpmwrtipC1.a1:
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 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)
  • Ambient temperature(tkair)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Mixer kinetic (physical) temperature(tkxc)
  • (tknd)
  • Blackbody kinetic temperature(tkbb)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz blackbody(bb31)
sgp1mwravgC1.c1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Fraction of data in averaging interval flagged by Dynamic Linear Model as poten(dlm_flag_fraction)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Number of contiguous periods in averaging interval with water on Teflon window(water_flag_periods)
  • Standard deviation about the mean for the total water vapor amount(vap_sdev)
  • MWR column precipitable water vapor(vap)
  • Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
  • 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)
  • Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
  • IR Brightness Temperature(ir_temp)
  • Number of contiguous periods in averaging interval flagged by Dynamic Linear Mo(dlm_flag_periods)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D051011.6
Start DateStart TimeEnd DateEnd Time
07/31/2002202708/04/20051959
Subject:
SGP/MWR/C1 - New software version (4.15) installed
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.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 08/04/2005. As a consequence of this 
upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to 
~50s.
Measurements:sgpmwrtipC1.a1:
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • Blackbody kinetic temperature(tkbb)
  • (tknd)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 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)
  • 23.8 GHz Blackbody signal(bb23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
sgpmwrlosC1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz sky signal(sky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)

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DQRID : D060717.2
Start DateStart TimeEnd DateEnd Time
07/13/2006120007/28/20061600
Subject:
SGP/MWR/C1 - Spikes in ambient temperature readings
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
There are intermittent spikes in the Tkair temperature (T ~ 400 K). On 7/28 the sensor 
was cleaned and the instrument power cycled following a power outage. Readings came back to 
normal.
Measurements:sgpmwrtipC1.a1:
  • Ambient temperature(tkair)
sgpmwrlosC1.b1:
  • Ambient temperature(tkair)

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DQRID : D070314.2
Start DateStart TimeEnd DateEnd Time
01/12/2007000001/15/20070000
Subject:
SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag
DataStreams:sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1
Description:
Between 01/12 and 01/15 brightness temperatures show high values (Tb > 100 K) indicative 
of rain, however the wet_window flag is 0 (indicative of no rain). During that time there 
where freezing conditions with ice pellets that were not detected by the sensor. The high 
brightness temperatures may be due to melting ice on the window.
Measurements:sgpmwrtipE14.a1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
sgpmwrtipC1.a1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
sgpmwrlosE14.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
sgpmwrlosC1.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)

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DQRID : D070802.3
Start DateStart TimeEnd DateEnd Time
07/14/2007000008/03/20071508
Subject:
SGP/MWR/C1 - Noisy data
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
Since 7/14 the MWR is experiencing intermittent periods of increased noise. The cause for 
this is under investigation.
Measurements:sgpmwrtipC1.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)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz sky signal(tipsky23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 23.8 GHz Blackbody signal(bb23)
  • 31.4 GHz blackbody(bb31)
sgpmwrlosC1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • 23.8 GHz Blackbody signal(bb23)
  • 23.8 GHz sky signal(sky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky signal(sky31)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz blac2body+noise injection signal(bbn31)

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DQRID : D071128.2
Start DateStart TimeEnd DateEnd Time
11/19/2007213611/22/20071400
Subject:
SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess
DataStreams:sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
After the radiometer was reinstalled it had to update the calibration coefficients.
Data will be reprocessed
Measurements:sgp5mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
sgpmwrtipC1.a1:
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz sky signal(tipsky31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
sgpmwrlosC1.b1:
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • MWR column precipitable water vapor(vap)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 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)

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DQRID : D080103.2
Start DateStart TimeEnd DateEnd Time
07/21/1993180907/23/19931541
08/07/1993214308/09/19931308
08/14/1993223308/16/19931300
08/29/1993120708/31/19931206
09/17/1993215809/20/19931311
10/02/1993161210/04/19931338
10/09/1993074110/11/19931319
11/12/1993120711/15/19931413
11/19/1993202711/21/19931957
12/14/1993230003/21/19941759
03/28/1994145903/30/19942225
05/16/1994190005/19/19942018
06/22/1994160007/11/19941859
07/16/1994030007/19/19942006
09/03/1994164709/05/19941341
09/09/1994232509/11/19941543
12/17/1994004912/19/19941441
01/05/1995000001/05/19952359
01/28/1995005401/30/19951443
04/01/1995000004/03/19951610
05/09/1995220005/11/19952350
06/24/1995090306/26/19950159
07/07/1995162507/10/19951409
07/19/1995174107/21/19951906
07/28/1995190007/31/19951918
08/22/1995161608/25/19952359
12/01/1995143401/11/19962214
01/12/1996200001/23/19962030
01/23/1996233202/08/19962359
08/06/1996000008/06/19962359
09/04/1996191009/08/19962359
09/14/1996070009/16/19961759
09/30/1996000009/30/19962359
12/01/1996000012/01/19962359
07/01/1997000007/01/19972359
02/20/1998233902/22/19980042
05/04/1998000005/04/19982359
07/18/1998033707/20/19981355
09/28/1998000009/28/19982359
10/10/1998235910/12/19981959
10/17/1998170510/19/19981535
12/25/1998223312/28/19982026
02/06/1999123502/08/19991652
03/13/1999204803/15/19992040
07/23/1999205907/26/19991408
12/04/1999080012/06/19991821
01/07/2000144602/02/20002224
05/24/2000145505/31/20001505
06/06/2000162006/14/20001451
09/01/2000220009/05/20001526
09/15/2000205709/18/20001339
09/23/2000123609/25/20001430
01/13/2001201101/16/20011647
02/24/2001023002/26/20011508
03/03/2001070103/05/20011546
03/10/2001070203/12/20011535
03/17/2001070203/19/20011422
03/24/2001070303/26/20011516
03/30/2001203804/02/20011423
05/05/2001104205/07/20011514
05/18/2001153405/21/20011451
06/22/2001220006/25/20011438
06/30/2001061607/02/20011435
07/28/2001194407/30/20011357
08/24/2001134808/27/20011751
09/07/2001184209/10/20011439
09/15/2001153309/17/20011459
10/13/2001003310/15/20011526
11/03/2001084011/05/20011613
11/10/2001055811/13/20011518
11/16/2001170111/19/20011706
12/21/2001215312/24/20011442
01/30/2002084502/11/20021632
03/02/2002033903/04/20021533
03/09/2002034003/11/20021621
06/26/2002163906/28/20022057
09/01/2002100209/03/20021332
12/21/2002112412/23/20021510
01/04/2003070301/06/20031529
08/09/2003003708/11/20031456
08/23/2003210108/25/20031456
10/12/2003202510/14/20031414
11/29/2003184012/01/20031502
01/24/2004074301/26/20041505
02/14/2004231602/17/20041520
09/04/2004025009/07/20041419
10/09/2004074510/11/20041739
10/16/2004225010/18/20041355
11/13/2004184911/15/20041521
12/03/2004194012/06/20041454
01/15/2005065201/18/20051446
01/22/2005144901/24/20051444
06/10/2005211806/13/20051603
08/05/2005170108/30/20052001
10/07/2005165811/16/20051945
11/18/2005180111/21/20051521
11/23/2005220111/25/20051550
11/26/2005010111/28/20051543
12/03/2005104312/05/20051559
01/14/2006182201/17/20061512
01/21/2006070801/23/20061515
02/03/2006190302/06/20061533
02/25/2006073002/27/20061420
07/01/2006222507/03/20061413
11/28/2006214312/01/20061911
06/09/2007115006/11/20071300
07/07/2007164207/09/20071304
08/03/2007160111/19/20072135
12/22/2007211212/24/20071504
05/25/2008181505/27/20081335
06/06/2008151206/09/20080238
05/08/2009153505/11/20091254
Subject:
SGP/MWR/C1 - Missing data
DataStreams:sgpmwrlosC1.b1
Description:
Data are missing and unrecoverable.
Measurements:sgpmwrlosC1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • lon(lon)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • Blackbody kinetic temperature(tkbb)
  • lat(lat)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Ambient temperature(tkair)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz sky signal(sky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • base time(base_time)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)
  • Dummy altitude for Zeb(alt)

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DQRID : D081013.5
Start DateStart TimeEnd DateEnd Time
05/01/2008000011/30/20082300
Subject:
SGP/MWR/C1 - Increased noise in 31.4 GHz channel
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
The 31.4 GHz channel has been showing an increased level of noise which results in 
increased noise in the LWP retrievals. The instrument is tipping and all other parameters seem 
to be in the range. The elevate noise started in May, but it seems to have become slightly 
worse after summer. After November the noise level seems to have gone back to normal.
Measurements:sgpmwrtipC1.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)

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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:sgpmwrlosB1.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)
sgpmwrlosB6.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
sgpmwrtipB4.a0:
  • 23.8 GHz sky signal(23tipsky)
  • 31.4 GHz sky signal(31tipsky)
sgpmwrtipB6.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
sgpmwrtipB1.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
sgpmwrtipB5.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)
sgpmwrlosB4.a1:
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosB5.a1:
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)

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END OF DATA