Data Quality Reports for Session: 148850 User: dfeldman Completed: 03/19/2013


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
D020905.3SGP/MWR/C1 - Reprocess: IRT insufficiently insulatedsgpmwrlosC1.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 datasgpmwrlosC1.b1, sgpmwrtipC1.a1
D081013.5SGP/MWR/C1 - Increased noise in 31.4 GHz channelsgpmwrlosC1.b1, sgpmwrtipC1.a1
D940820.1SGP/MWR/C1 - IRT rain lid removalsgpmwrlosC1.a1, sgpmwrlosC1.b1
D950110.2SGP/MWR/C1 - Data dropouts due to serial comm problemssgpmwrlosC1.a1, sgpmwrlosC1.b1
D950501.2SGP/MWR/C1 - IR thermometer calibration checksgpmwrlosC1.a1, sgpmwrlosC1.b1
D960405.1SGP/MWR/C1 - Loss of thermal stabilizationsgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D960422.1SGP/MWR/C1 - Radio Frequency Interference during IOPsgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D961114.1SGP/MWR/C1 - IRT lens replacedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D961120.1SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustmentsgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1,
sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1,
sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D961220.1SGP/MWR/C1 - IRT Calibration checksgpmwrlosC1.a1, sgpmwrlosC1.b1
D970509.1SGP/MWR/C1 - IRT CalibrationsgpmwrlosC1.a1, sgpmwrlosC1.b1
D980130.1SGP/MWR/C1 - IRT offlinesgpmwrlosC1.a1, sgpmwrlosC1.b1
D980507.1SGP/MWR/C1 - IRT lens replacedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D981204.1SGP/MWR/C1 - Erroneous internal temperaturesgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
D990106.1SGP/MWR/B1/B4/B6/C1 - software changesgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0,
sgpmwrtipB4.a0, sgpmwrtipB6.a0, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1
D990113.1SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrtipB1.a0,
sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0, sgpmwrlosC1.a1, sgpmwrlosC1.b1


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 : D020905.3
Start DateStart TimeEnd DateEnd Time
01/19/1994000011/27/19981930
Subject:
SGP/MWR/C1 - Reprocess: IRT insufficiently insulated
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The downwelling IRT was insufficiently insulated to maintain an internal 
reference temperature above 0 degrees C. Measurements of sky temperature were 
over-estimated when instrument was below freezing.

Data will be reprocessed, but users can correct data using the following correction 
factor:

If T_reference < -5?C, then

  IRT_corrected = (IRT_original - 32.993K)/0.87238

where T_reference can be estimated with the ambient temperature (e.g.
tkair)
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)


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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: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)


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DQRID : D080103.2
Start DateStart TimeEnd DateEnd Time
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
01/18/2013210001/22/20131500
02/16/2013150002/19/20131300
06/10/2005211806/13/20051603
08/05/2005170108/30/20052001
01/15/2005065201/18/20051446
01/22/2005144901/24/20051444
12/03/2004194012/06/20041454
10/16/2004225010/18/20041355
11/13/2004184911/15/20041521
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
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
10/13/2001003310/15/20011526
11/03/2001084011/05/20011613
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
02/24/2001023002/26/20011508
03/03/2001070103/05/20011546
09/23/2000123609/25/20001430
01/13/2001201101/16/20011647
06/06/2000162006/14/20001451
09/01/2000220009/05/20001526
09/15/2000205709/18/20001339
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
Subject:
SGP/MWR/C1 - Missing data
DataStreams:sgpmwrlosC1.b1, sgpmwrtipC1.a1
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
  • tkbb
  • tknd
  • tkxc
  • 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
  • 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 : D940820.1
Start DateStart TimeEnd DateEnd Time
01/01/1994000008/16/19942359
Subject:
SGP/MWR/C1 - IRT rain lid removal
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The IR thermometer (or IRT) was deployed at the SGP central facility in
January 1994 with an automatic mechanism which closed a protective lid
over the zenith-viewing lens when a moisture detector indicated
condensation or precipitation.

Since that time the 120 VAC-to-12 VAC transformer in the lid mechanism
has failed 5 times with an average downtime of two weeks.  In addition,
the collar by which the (normally open) lid is attached to the lens
barrel of the IRT has made it difficult for site operations personnel
to observe the condition of the IRT lens.  As a result, dirt and
insects have been able to accumulate on the lens.  This has resulted in
long periods of invalid data.

To alleviate these problems the lid mechanism was removed from service
on 16 August at my recommendation.

It is anticipated that condensation and precipitation will result in
invalid data.  However, these events should be readily detectable
because the observed IR temperature will closely match the ambient
temperature (e.g. the temperature of the moisture on the lens) which is
usually much greater than the sky or cloud base temperature normally
measured.  I believe that this will not result in a large increase in
invalid data because these data would have been invalid anyway when the
lid was closed.  (This situation is now the same as for the other 
radiometers at the site.)

In addition, removing the attaching collar from the lens barrel will
prevent insects from nesting in it, and will permit site operations
personnel easy access to the lens so that they may more easily maintain
it in a clean condition.

A summary of the quality of the IR thermometer data in general,
including notes on the performance of the protective lid, follows:

JANUARY 1994
 19-JAN:  Operational.  No IR data collected.

FEBRUARY 1994
  2-FEB:  Failure of lid reported.  Transformer burned out.
 15-FEB:  IRT returned to service.    
 24-FEB:  Valid data begin.

MARCH 1994
  3-MAR:  Failure of lid reported. Transformer burned out.
  8-MAR:  IRT returned to service.
  8-MAR:  Cable problems reported.
 17-MAR:  Cable problems resolved.  IRT returned to service.
 17-27-MAR:  Comparison with AERI indicates IRT 1-10 deg C higher; 
          increasing error with decreasing temperatures.  Probably  
          due to dirt/debris on lens.  Also, IRT calibration not valid
          below -50 deg C (223 K).
 21-MAR:  Problems with O-ring on lid sticking reported/repaired.

APRIL 1994
 Data values below -50 deg C (223 K) not valid - below range of 
 calibration.  Otherwise data within 2-3 degrees of AERI.
 24-APR: Large (10-20 Deg C) offset between IRT and AERI develops.

MAY 1994
  7-MAY: Mentor visits site, observes spider's nest and dead insects
         inside collar attaching lid to lens barrel in optical path of
         instrument. Probably the source of the offset between IRT and
         AERI during late and April.
  9-MAY: Insects removed, lens cleaned by site operations personnel.
         Agreement between IRT and AERI within 1 deg C.
 23-MAY: Failure of lid reported.  Transformer burned out.

JUNE 1994
 22-JUN: Rebuilt/redesigned lid mechanism put in service; data collection
         computer fails same day.

JULY 1994
 11-JUL: Computer returned to service.  
         Agreement between IRT and AERI within 1 deg C.
 22-JUL: Failure of lid reported.  Transformer burned out.

AUGUST 1994
  3-AUG: IRT returned to service.
 12-AUG: Failure of lid reported.  Transformer burned out.
 16-AUG: Lid mechanism abandoned.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


Back To Table of Contents

DQRID : D950110.2
Start DateStart TimeEnd DateEnd Time
01/01/1994000012/31/19942359
Subject:
SGP/MWR/C1 - Data dropouts due to serial comm problems
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
Conflicts between the drop shipper program and the MWR operation program resulted in 
serial communication problems which ultimately manifested as spikes and dropouts in the data.
Measurements:sgpmwrlosC1.a1:
  • time_offset
  • tknd
  • tnd_nom31
  • tc23
  • tnd31
  • 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)
  • wet_window
  • tkxc
  • sky23
  • bb31
  • tnd23
  • bbn23
  • tkair
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom23
  • IR Brightness Temperature(sky_ir_temp)
  • base_time

sgpmwrlosC1.b1:
  • bbn23
  • tkxc
  • wet_window
  • tnd_nom31
  • tc31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • Total liquid water along LOS path(liq)
  • tkbb
  • sky31
  • tc23
  • time_offset
  • 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)
  • base_time
  • tnd31
  • tknd


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DQRID : D950501.2
Start DateStart TimeEnd DateEnd Time
04/30/1995163004/30/19951700
Subject:
SGP/MWR/C1 - IR thermometer calibration check
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
Mentor used an Everest model 1000 ambient temperature target 
(emis.=0.98) to check the calibration of the Heiman IR pyrometer
(IR thermometer).  Data collected during this period will be
anomalous due to the modifications of the instrument settings
required to facilitate the calibration.

The emissivity of the instrument was changed to match the target;
units were changed to deg C (from K) to match the target LCD units;
integration time on the instrument was changed to 3 seconds (from 1
second).

Centered the target on the instrument lens and allowed it to rest
on the lens barrel so that it filled the field of view of the
instrument. Both the instrument LCD and target LCD indicated 16.7
deg C.

Noted that although the lens appeared clean, there was some liquid
water around the edge which formed a meniscus with the inside of
the lens barrel. Wiped this away with a clean, lint-free cotton
cloth.

Replaced the target on the lens barrel; both instrument and target
then indicated 17.1 deg C.

Reset the instrument emissivity (=1.0), the units (kelvins) and
the integration time (=1 sec).

The IRT was deployed in December 1993.  Its calibration appears to
have been stable since deployment.  Liquid water around the edge of
the lens appears to be out of the field of view and does not appear
to affect the data.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


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DQRID : D960405.1
Start DateStart TimeEnd DateEnd Time
08/26/1995000009/04/19952359
08/19/1995000008/20/19952359
07/01/1996182507/23/19962300
Subject:
SGP/MWR/C1 - Loss of thermal stabilization
DataStreams:sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
Periodically during August and September 1995 all microwave radiometers
at the SGP CART generated error messages in the Site Operations Log
like:

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

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

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

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

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

Note that the instruments with the lowest set points had the most
loss-of-stabilization events.
Measurements:sgp5mwravgC1.c1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 23tbsky
  • 31tbsky

sgp1mwravgC1.c1:
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • 31tbsky

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)


Back To Table of Contents

DQRID : D960422.1
Start DateStart TimeEnd DateEnd Time
04/09/1996133704/09/19961834
04/10/1996062504/10/19961823
04/11/1996114904/11/19961649
04/12/1996091704/12/19961858
04/13/1996060504/13/19961801
Subject:
SGP/MWR/C1 - Radio Frequency Interference during IOP
DataStreams:sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
During the specified times a strong, continuous signal was 
measured by the 31.4 GHz of the MWR.  The signal was present
in all 31.4 GHz measurements including the sky measurement,
the internal reference target measurement, and the measurement
of the internal noise injection source from which the
instantaneous instrument gain is computed.

The source of the interference has not yet been identified.

Because the gain is computed using the difference of the
noise injection and target measurements, and because the
sky brightness temperature is computed relative to the
internal target temperature, the data appear anomalous
only for a period of an hour after the interference starts
and ends.  This is due to the low pass filter applied to
the instantaneous gain.  However the data should be
considered invalid or at least questionable during the
entire period for which the interference was present.
Measurements:sgp5mwravgC1.c1:
  • vap_sdev
  • lon
  • Temperature, brightness, longwave(ir_temp)
  • number_obs_averaged
  • 23tbsky
  • liq_sdev
  • lat
  • prob_slope_change
  • time_offset
  • base_time
  • tbsky23_sdev
  • ir_temp_sdev
  • num_obs
  • 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)
  • alt
  • num_obs_irt
  • Total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(tbsky31)

sgpmwrlosC1.a1:
  • tknd
  • tnd31
  • alt
  • wet_window
  • tnd23
  • lat
  • 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
  • lon
  • bbn23
  • IR Brightness Temperature(sky_ir_temp)
  • base_time

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 : D961114.1
Start DateStart TimeEnd DateEnd Time
01/19/1994000010/28/19961618
Subject:
SGP/MWR/C1 - IRT lens replaced
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The lens of the uplooking "IR thermometer" (a 10 micrometer pyrometer)
was replaced on 28 October 1996 at 16:18 GMT.  At the time the sky was
heavily overcast (0.1-0.5 mm liquid water path, IR temperature =
281-285 K) with about 4 cm integrated water vapor.  A comparison was
carried out against the Atmospheric Emitted Radiance Interferometer
(AERI) both prior to and subsequent to the lens change.  The statistics
of the differences (IRT-AERI) are as follows:

         Mean (K)  Std Dev (K)   No.
Before:    0.64      0.24       122
After:     0.35      0.20        89

In addition, the downward step change in the time series plot of the
temperature difference (IRT-AERI) at the time of the lens replacement
is obvious.

This suggests, but is not conclusive evidence, that the primary cause
of the differences between the IRT and AERI reported previously
(PIF no. P960809.2) may have been the weather-worn lens.  However,
as this instrument has not been calibrated since it was deployed in
December 1993, there may also be calibration drift to contend with.

Arrangements are being pursued with NREL to check the calibration of
this instrument.

It is preferable to carry out the IRT vs AERI comparison for clear sky
conditions to be certain that both instruments are observing the same
scene at the moment when they make sky measurements.  However, it is
not possible at this time of the year to carry out a clear sky
comparison because the integrated water vapor is generally less than
2.0 cm which means that the IR temperature is less than 223 K, the
lower limit of the D/A converter on the IRT.

On the positive side, the AERI and the IRT are within 10 m of each
other and have similar fields of view (about 2 degrees) so their
scenes should be comparable for clear or cloudy skies.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


Back To Table of Contents

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

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

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

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

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

It is not clear why a temporary change in gain should occur or even
whether it did.  But users of the data should be aware that the data
from the microwave radiometers at the SGP may be anomalous during
August 1996.
Measurements:sgpmwrlosB1.a1:
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 31tbsky

sgpmwrlosB1.a0:
  • 23tbsky
  • Total water vapor along LOS path(vap)
  • 31tbsky
  • Total liquid water along LOS path(liq)

sgp1mwravgC1.c1:
  • 31tbsky
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • Total liquid water along LOS path(liq)

sgpmwrlosC1.a1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

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)

sgp5mwravgB5.c1:
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • 31tbsky

sgp5mwravgB1.c1:
  • Total water vapor along LOS path(vap)
  • 31tbsky
  • 23tbsky
  • Total liquid water along LOS path(liq)

sgp5mwravgB4.c1:
  • 31tbsky
  • Total liquid water along LOS path(liq)
  • 23tbsky
  • Total water vapor along LOS path(vap)

sgpmwrlosB6.a1:
  • 23tbsky
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31tbsky

sgp5mwravgC1.c1:
  • 23tbsky
  • Total water vapor along LOS path(vap)
  • 31tbsky
  • Total liquid water along LOS path(liq)

sgpmwrlosB6.a0:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31tbsky
  • 23tbsky

sgpmwrlosB4.a0:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)
  • 31tbsky
  • 23tbsky

sgpmwrlosB5.a0:
  • Total liquid water along LOS path(liq)
  • 31tbsky
  • Total water vapor along LOS path(vap)
  • 23tbsky

sgpmwrlosB4.a1:
  • 31tbsky
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 23tbsky

sgpmwrlosB5.a1:
  • Total water vapor along LOS path(vap)
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • 31tbsky

sgp5mwravgB6.c1:
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • 31tbsky


Back To Table of Contents

DQRID : D961220.1
Start DateStart TimeEnd DateEnd Time
12/03/1996193712/12/19961920
Subject:
SGP/MWR/C1 - IRT Calibration check
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
IRT was out of service for calibration check.  MWR was powered
down on 96/12/03 1937-1949 to remove IRT and on 96/12/12 1848-1920
to re-install IRT.

The following is from the NREL Metrology Laboratory test report of 12/10/97:

Temperature     Nominal Value     Measured Value
-----------     -------------     --------------
  0 C             273.2 K           274.1 K
 10               283.2             283.6
 20               293.2             293.6
 30               303.2             303.2
 40               313.2             313.2

In the range tested, the temperature difference is within the
resolution of the instrument, so the IRT was not adjusted and
the calibration factor was not changed.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


Back To Table of Contents

DQRID : D970509.1
Start DateStart TimeEnd DateEnd Time
05/05/1997000005/05/19972359
Subject:
SGP/MWR/C1 - IRT Calibration
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
Comparison of the uplooking IRT with AERI for 5 May 1997 during a time
when the 9-11 micrometer sky temperature was in the range 220-228 K,
according to AERI, the IRT indicated approximately 3 K higher.  This is
outside of the specified uncertainty in the IRT and indicates that the
calibration needs to be revised.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


Back To Table of Contents

DQRID : D980130.1
Start DateStart TimeEnd DateEnd Time
09/09/1997181109/12/19972037
Subject:
SGP/MWR/C1 - IRT offline
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The IRT was removed from the MWR to perform a comparison/calibration check prior to the 
Integrated IOP.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


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DQRID : D980507.1
Start DateStart TimeEnd DateEnd Time
04/01/1998000004/30/19982042
Subject:
SGP/MWR/C1 - IRT lens replaced
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
During my recent trip to the SGP I noticed that the IRT was reading
too high (about 250 K for clear sky with less than 2 cm PWV).  The
anti-reflective coating on the lens appeared to have deteriorated
significantly.  Because I observed no change in the measurements
after cleaning the lens, I replaced it with the original lens which
had been saved as a spare.

The measured sky temperature fell to 232 K, which appeared more reasonable.

The next morning I realized that I had forgotten to clean the lens
after replacing it.  After cleaning the IR temperature fell from 219
to 213 K with about 1.2 cm PWV.  This appeared to be in agreement
with Martin Platt's radiometer which measures the same passband
(10 micrometers.)

Upon returning to Ames, I compared the IRT with AERI for April 1998.
It appears that at least as far back as 1 April the IRT data are bad.
Measurements:sgpmwrlosC1.a1:
  • IR Brightness Temperature(sky_ir_temp)

sgpmwrlosC1.b1:
  • IR Brightness Temperature(sky_ir_temp)


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DQRID : D981204.1
Start DateStart TimeEnd DateEnd Time
10/21/1998190011/12/19982200
Subject:
SGP/MWR/C1 - Erroneous internal temperature
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1
Description:
After the new internal temperature sensor was installed it was discovered
that the scaling resistor was incorrect.  (The 24.9 kohm 0.1% resistor
had accidently been replaced with a 24.0 kohm resistor when the analog
board was repaired by the manufacturer several years ago.)  A resistor
having the correct value was installed 981112.
Measurements:sgpmwrtipC1.a1:
  • tkair

sgpmwrlosC1.a1:
  • tkair

sgpmwrlosC1.b1:
  • tkair


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DQRID : D990106.1
Start DateStart TimeEnd DateEnd Time
04/03/1995000010/12/19981900
Subject:
SGP/MWR/B1/B4/B6/C1 - software change
DataStreams:sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0,
sgpmwrtipB4.a0, sgpmwrtipB6.a0, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1
Description:
The MWR operating software was changed on 12 October 1998 to provide additional 
functionality as described below. This change affects the format of the raw and ingested data. 
   
NEW FEATURES
1. Faster sampling rate
   
Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 
20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per 
blackbody sample and gain update.)
   
2. More flexible sampling strategy
   
Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. 
This permits sky samples to be acquired at intervals of 2.67 seconds for improved 
temporal resolution of cloud liquid water variations and better coordination with the millimeter 
cloud radar during IOPs.
   
3. Separation of zenith LOS observations from TIP data
   
When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV 
and LWP computed and reported separately in the output file. This eliminates the periods 
of missing LOS data during calibration checks/updates.
   
4. Automatic self-calibration
   
The software now permits the calibration to be updated at specified intervals or 
continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified 
intervals or whenever clear sky conditions occur, the tip data reduced, the calibration 
updated ,and the radiometer returned to LOS mode without operator intervention. In the 
second case, the radiometer is continuously is TIP mode until changed by the operator.
   
5. Graphical user display
   
The graphical display is comprised of a status display, a message display, a temperature 
plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip 
curves.

Editor's Note: The SGP.C1 data were reprocessed in 2004 and enhancement #3 described above 
was applied to the data prior to Oct 1998.  The SGP.BF data are queued for reprocessing 
as well.
Measurements:sgpmwrlosB1.a1:
  • tkair
  • tnd23
  • tknd
  • tnd31

sgpmwrlosB6.a1:
  • tnd23
  • tnd31
  • tknd
  • tkair

sgpmwrtipB4.a0:
  • tnd23I
  • tnd31I

sgpmwrlosB1.a0:
  • tknd
  • tkair
  • tnd31
  • tnd23

sgpmwrlosB6.a0:
  • tnd31
  • tknd
  • tnd23
  • tkair

sgpmwrlosB4.a0:
  • tnd31
  • tkair
  • tknd
  • tnd23

sgpmwrtipB6.a0:
  • tnd23I
  • tnd31I

sgpmwrtipB1.a0:
  • tnd23I
  • tnd31I

sgpmwrlosC1.a1:
  • tknd
  • tnd31
  • tnd23
  • tkair

sgpmwrlosC1.b1:
  • tkair
  • tnd23
  • tnd31
  • tknd

sgpmwrlosB4.a1:
  • tnd31
  • tkair
  • tnd23
  • tknd


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DQRID : D990113.1
Start DateStart TimeEnd DateEnd Time
07/21/1993140601/12/19992359
Subject:
SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrtipB1.a0,
sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0, sgpmwrlosC1.a1, sgpmwrlosC1.b1
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:
  • 23tipsky
  • 31tipsky

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


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END OF DATA