Data Quality Reports for Session: 150104 User: shannon1t1 Completed: 05/13/2013

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 skippingsgpmwrlosC1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1
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 problemsgpmwrlosC1.b1, sgpmwrtipC1.a1, sgp1mwravgC1.c1, sgp5mwravgC1.c1
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 - Reprocessed: Radiometer reinstalledsgpmwrlosC1.b1, sgpmwrtipC1.a1
D080103.2SGP/MWR/C1 - Missing datasgpmwrtipC1.a1, sgpmwrlosC1.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)sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1,
sgpmwrlosB6.a1, 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:
  • IR Brightness Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • IR Brightness 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:
  • liqtip
  • vaptip
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total water vapor along LOS path(vap)
  • 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
  • tipsky23
  • tipsky31
  • tnd31I
  • r23
  • bbn31
  • tnd_nom23
  • tkair
  • actaz
  • tbsky31tip
  • tnd23
  • tc23
  • liqtip
  • actel
  • tnd23I
  • tbsky23tip
  • tkxc
  • tknd
  • tkbb
  • wet_window
  • bb23
  • tnd31
  • tc31
  • vaptip
  • bbn23
  • r31
  • tnd_nom31
  • base_time
  • bb31
sgpmwrlosC1.a1:
  • tknd
  • tnd31
  • wet_window
  • tnd23
  • tkair
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom23
  • time_offset
  • tnd_nom31
  • tc23
  • bb23
  • bbn31
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • sky31
  • tkbb
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tkxc
  • sky23
  • bb31
  • bbn23
  • IR Brightness Temperature(sky_ir_temp)
  • base_time
sgpmwrlosC1.b1:
  • wet_window
  • bbn31
  • tkair
  • sky23
  • tnd23
  • base_time
  • tnd31
  • tknd
  • bbn23
  • tkxc
  • tnd_nom31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc31
  • Total liquid water along LOS path(liq)
  • tkbb
  • sky31
  • tc23
  • time_offset
  • bb31
  • Total water vapor along LOS path(vap)
  • bb23
  • tnd_nom23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • IR Brightness 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:
  • IR Brightness Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • IR Brightness 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:sgpmwrlosC1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1
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:
  • Total liquid water along LOS path(liq)
  • bbn23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tkair
  • tknd
  • tnd_nom23
  • wet_window
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • bbn31
  • bb31
  • tnd23
  • tc23
  • sky23
  • tc31
  • bb23
  • tnd_nom31
  • IR Brightness Temperature(sky_ir_temp)
  • tnd31
  • tkxc
  • sky31
  • Total water vapor along LOS path(vap)
  • tkbb
sgpmwrlosC1.a1:
  • tknd
  • tnd31
  • wet_window
  • tnd23
  • tkair
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom23
  • tnd_nom31
  • tc23
  • bb23
  • bbn31
  • Total water vapor along LOS path(vap)
  • sky31
  • Total liquid water along LOS path(liq)
  • tkbb
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tkxc
  • sky23
  • bb31
  • bbn23
  • IR Brightness Temperature(sky_ir_temp)
sgpmwrlosC1.b1:
  • wet_window
  • bbn31
  • tkair
  • sky23
  • tnd23
  • tnd31
  • tknd
  • bbn23
  • tkxc
  • tnd_nom31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc31
  • Total liquid water along LOS path(liq)
  • tkbb
  • sky31
  • tc23
  • time_offset
  • bb31
  • Total water vapor along LOS path(vap)
  • bb23
  • tnd_nom23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • IR Brightness Temperature(sky_ir_temp)
sgpmwrlosB4.a1:
  • tc23
  • tkbb
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • sky31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tkair
  • tknd
  • tnd23
  • bbn31
  • bb31
  • Total liquid water along LOS path(liq)
  • tkxc
  • tnd31
  • IR Brightness Temperature(sky_ir_temp)
  • tnd_nom31
  • sky23
  • bbn23
  • bb23
  • Total water vapor along LOS path(vap)
  • tnd_nom23
  • tc31
  • 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:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
sgp1mwravgC1.c1:
  • Total water vapor along LOS path(vap)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Total liquid water along LOS path(liq)
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(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
  • 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:
  • tkair
sgpmwrlosC1.b1:
  • 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:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • wet_window
sgpmwrlosC1.b1:
  • wet_window
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total water vapor along LOS path(vap)
  • 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:
  • tc23
  • tnd23I
  • tkxc
  • tknd
  • tkbb
  • wet_window
  • tnd31I
  • tnd_nom23
  • tkair
  • tnd31
  • tc31
  • tnd_nom31
  • tnd23
sgpmwrlosC1.a1:
  • tknd
  • tnd_nom31
  • tc23
  • tnd31
  • tkbb
  • tc31
  • wet_window
  • tkxc
  • tnd23
  • tkair
  • tnd_nom23
sgpmwrlosC1.b1:
  • tkxc
  • wet_window
  • tnd_nom31
  • tc31
  • tkbb
  • tc23
  • tkair
  • tnd_nom23
  • tnd23
  • 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:
  • liqtip
  • vaptip
  • tbsky23tip
  • tbsky31tip
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total water vapor along LOS path(vap)
  • 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:
  • liqtip
  • vaptip
sgpqmemwrcolC1.c1:
  • mean_liq_mwr
  • mean_vap_mwr
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
sgpmwrlosC1.b1:
  • Total water vapor along LOS path(vap)
  • 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
  • tipsky23
  • tipsky31
  • tnd31I
  • bbn31
  • r23
  • tnd_nom23
  • tkair
  • lon
  • actaz
  • tbsky31tip
  • lat
  • tnd23
  • tc23
  • actel
  • liqtip
  • tnd23I
  • tbsky23tip
  • tkxc
  • tknd
  • tkbb
  • wet_window
  • bb23
  • tnd31
  • tc31
  • vaptip
  • alt
  • bbn23
  • r31
  • tnd_nom31
  • base_time
  • bb31
sgpmwrlosC1.b1:
  • wet_window
  • lon
  • bbn31
  • tkair
  • sky23
  • tnd23
  • base_time
  • tnd31
  • tknd
  • bbn23
  • tkxc
  • tnd_nom31
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • tkbb
  • lat
  • sky31
  • tc23
  • time_offset
  • bb31
  • Total water vapor along LOS path(vap)
  • bb23
  • tnd_nom23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • IR Brightness Temperature(sky_ir_temp)
  • 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:
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
sgpmwrtipC1.a1:
  • liqtip
  • vaptip
sgpqmemwrcolC1.c1:
  • mean_liq_mwr
  • mean_vap_mwr
sgp1mwravgC1.c1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
sgpmwrlosC1.b1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)

Back To Table of Contents

DQRID : D050915.1
Start DateStart TimeEnd DateEnd Time
07/28/2005140008/05/20051700
Subject:
SGP/MWR/C1 - Instrument noise problem
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgp1mwravgC1.c1, sgp5mwravgC1.c1
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:
  • vap_sdev
  • Temperature, brightness, longwave(ir_temp)
  • number_obs_averaged
  • 23tbsky
  • liq_sdev
  • prob_slope_change
  • tbsky23_sdev
  • ir_temp_sdev
  • water_flag_fraction
  • tbsky31_sdev
  • Total water vapor along LOS path(vap)
  • prob_outlier
  • 31tbsky
  • water_flag
  • prob_level_change
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)
sgpmwrtipC1.a1:
  • tipsky23
  • tipsky31
  • tnd31I
  • r23
  • bbn31
  • tnd_nom23
  • tkair
  • tbsky31tip
  • tnd23
  • tc23
  • liqtip
  • tnd23I
  • tbsky23tip
  • tknd
  • tkbb
  • tkxc
  • wet_window
  • bb23
  • tnd31
  • tc31
  • vaptip
  • bbn23
  • r31
  • tnd_nom31
  • bb31
sgp1mwravgC1.c1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • 31tbsky
  • dlm_flag_fraction
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • water_flag_periods
  • vap_sdev
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • tbsky31_sdev
  • Total liquid water along LOS path(liq)
  • ir_temp_sdev
  • liq_sdev
  • tbsky23_sdev
  • water_flag_fraction
  • Temperature, brightness, longwave(ir_temp)
  • dlm_flag_periods
sgpmwrlosC1.b1:
  • wet_window
  • bbn31
  • tkair
  • sky23
  • tnd23
  • tnd31
  • tknd
  • bbn23
  • tkxc
  • tnd_nom31
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • tkbb
  • sky31
  • tc23
  • bb31
  • Total water vapor along LOS path(vap)
  • bb23
  • tnd_nom23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • IR Brightness 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:
  • tc23
  • liqtip
  • tnd23I
  • tbsky23tip
  • tipsky23
  • tipsky31
  • tkxc
  • tknd
  • tkbb
  • tnd31I
  • r23
  • bbn31
  • tnd_nom23
  • bb23
  • tkair
  • tnd31
  • tc31
  • vaptip
  • tbsky31tip
  • bbn23
  • r31
  • tnd_nom31
  • bb31
  • tnd23
sgpmwrlosC1.b1:
  • bbn23
  • tkxc
  • tnd_nom31
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • tkbb
  • sky31
  • tc23
  • bb31
  • bbn31
  • Total water vapor along LOS path(vap)
  • tkair
  • bb23
  • tnd_nom23
  • sky23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd23
  • IR Brightness Temperature(sky_ir_temp)
  • 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:
  • tkair
sgpmwrlosC1.b1:
  • 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:
  • wet_window
sgpmwrtipC1.a1:
  • wet_window
sgpmwrlosE14.b1:
  • wet_window
sgpmwrlosC1.b1:
  • 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:
  • liqtip
  • vaptip
  • tbsky23tip
  • tbsky31tip
  • tipsky23
  • bbn23
  • tipsky31
  • bbn31
  • bb23
  • bb31
sgpmwrlosC1.b1:
  • bbn23
  • bb23
  • sky23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • sky31
  • bb31
  • Total water vapor along LOS path(vap)
  • bbn31

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DQRID : D071128.2
Start DateStart TimeEnd DateEnd Time
11/19/2007213611/22/20071400
Subject:
SGP/MWR/C1 - Reprocessed: Radiometer reinstalled
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
After the radiometer was reinstalled it had to update the calibration coefficients.

Data reprocessed 20071217.
Measurements:sgpmwrtipC1.a1:
  • tc23
  • tc31
  • liqtip
  • vaptip
  • tbsky23tip
  • tbsky31tip
  • tipsky23
  • tipsky31
  • tnd_nom23
  • tnd_nom31
  • tnd23
  • tnd31
sgpmwrlosC1.b1:
  • tnd_nom23
  • tnd_nom31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc31
  • tnd23
  • Total liquid water along LOS path(liq)
  • tnd31
  • tc23
  • Total water vapor along LOS path(vap)

Back To Table of Contents

DQRID : D080103.2
Start DateStart TimeEnd DateEnd Time
12/01/1995143401/11/19962214
01/12/1996200001/23/19962030
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
01/23/1996233202/08/19962359
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
10/30/2010040011/01/20101200
09/24/2011190009/26/20111600
05/04/2012210005/07/20121300
07/19/1995174107/21/19951906
07/28/1995190007/31/19951918
08/22/1995161608/25/19952359
07/07/1995162507/10/19951409
01/18/2013210001/22/20131500
02/16/2013150002/19/20131300
03/15/2013210003/18/20131500
03/23/2013060003/25/20131200
06/24/1995090306/26/19950159
01/28/1995005401/30/19951443
04/01/1995000004/03/19951610
05/09/1995220005/11/19952350
09/09/1994232509/11/19941543
12/17/1994004912/19/19941441
01/05/1995000001/05/19952359
05/16/1994190005/19/19942018
06/22/1994160007/11/19941859
07/16/1994030007/19/19942006
09/03/1994164709/05/19941341
03/28/1994145903/30/19942225
10/09/1993074110/11/19931319
11/12/1993120711/15/19931413
11/19/1993202711/21/19931957
12/14/1993230003/21/19941759
07/21/1993180907/23/19931541
08/07/1993214308/09/19931308
09/17/1993215809/20/19931311
10/02/1993161210/04/19931338
08/14/1993223308/16/19931300
08/29/1993120708/31/19931206
Subject:
SGP/MWR/C1 - Missing data
DataStreams:sgpmwrtipC1.a1, sgpmwrlosC1.b1
Description:
Data are missing and unrecoverable.
Measurements:sgpmwrtipC1.a1:
  • time_offset
  • tipsky23
  • tipsky31
  • tnd31I
  • bbn31
  • r23
  • tnd_nom23
  • tkair
  • lon
  • actaz
  • tbsky31tip
  • lat
  • tnd23
  • tc23
  • actel
  • liqtip
  • tnd23I
  • tbsky23tip
  • tkxc
  • tknd
  • tkbb
  • wet_window
  • bb23
  • tnd31
  • tc31
  • vaptip
  • alt
  • bbn23
  • r31
  • base_time
  • tnd_nom31
  • bb31
sgpmwrlosC1.b1:
  • wet_window
  • lon
  • bbn31
  • tkair
  • sky23
  • tnd23
  • base_time
  • tnd31
  • tknd
  • bbn23
  • tkxc
  • tnd_nom31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc31
  • Total liquid water along LOS path(liq)
  • tkbb
  • lat
  • sky31
  • tc23
  • time_offset
  • bb31
  • Total water vapor along LOS path(vap)
  • bb23
  • tnd_nom23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • IR Brightness Temperature(sky_ir_temp)
  • 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:
  • liqtip
  • tbsky31tip
sgpmwrlosC1.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • 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:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1,
sgpmwrlosB6.a1, 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:
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 31tbsky
  • 23tbsky
sgpmwrlosB6.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31tbsky
  • 23tbsky
sgpmwrtipB4.a0:
  • 23tipsky
  • 31tipsky
sgpmwrtipB6.a0:
  • 31tipsky
  • 23tipsky
sgpmwrlosC1.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • 31.4 GHz sky brightness temperature(tbsky31)
sgpmwrtipB1.a0:
  • 31tipsky
  • 23tipsky
sgpmwrlosC1.b1:
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 31.4 GHz sky brightness temperature(tbsky31)
sgpmwrtipB5.a0:
  • 31tipsky
  • 23tipsky
sgpmwrlosB4.a1:
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • 31tbsky
  • Total liquid water along LOS path(liq)
sgpmwrlosB5.a1:
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • 31tbsky

Back To Table of Contents


END OF DATA