Data Quality Reports for Session: 140670 User: blmadhavan Completed: 02/18/2012

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
D030312.10SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperaturessgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D040824.1SGP/MWR/C1 - Wet window flag "on" more frequently than expectedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D080103.2SGP/MWR/C1 - Missing datasgpmwrlosC1.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 : 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 : 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 : D080103.2
Start DateStart TimeEnd DateEnd Time
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
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
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
02/03/2006190302/06/20061533
01/21/2006070801/23/20061515
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
10/09/2004074510/11/20041739
10/16/2004225010/18/20041355
11/13/2004184911/15/20041521
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
01/04/2003070301/06/20031529
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
12/21/2001215312/24/20011442
01/30/2002084502/11/20021632
Subject:
SGP/MWR/C1 - Missing data
DataStreams:sgpmwrlosC1.b1
Description:
Data are missing and unrecoverable.
Measurements:sgpmwrlosC1.b1:
  • bbn23
  • tkxc
  • wet_window
  • lon
  • tnd_nom31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc31
  • Total liquid water along LOS path(liq)
  • lat
  • 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
  • base_time
  • IR Brightness Temperature(sky_ir_temp)
  • tnd31
  • tknd
  • alt

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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)

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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