Data Quality Reports for Session: 104650 User: yost Completed: 03/06/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020905.3SGP/MWR/C1 - IRT not insulatedsgpmwrlosC1.a1, sgpmwrlosC1.b1
D020927.1SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivitiessgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
D990106.1SGP/MWR/B1/B4/B6/C1 - software changesgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0,
sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0
D990113.1SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0


DQRID : D020905.3
Start DateStart TimeEnd DateEnd Time
01/19/1994000011/27/19981930
Subject:
SGP/MWR/C1 - IRT not insulated
DataStreams:sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
The downwelling IRT was insufficiently insulated to maintain an internal 
reference temperature above 0 degrees C (P971213.1). Measurements of 
sky temperature were over-estimated when instrument was below freezing.
Measurements:sgpmwrlosC1.b1:
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)

sgpmwrlosC1.a1:
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)


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DQRID : D020927.1
Start DateStart TimeEnd DateEnd Time
12/01/1996000002/04/20002359
Subject:
SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities
DataStreams:sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
Description:
Prior to February 4, 2000, the ARSCL data set incorporated data from the
Beaufort Laser Ceilometer as one of its inputs.  Because of the BLC's
high spatial resolution, this data was often chosen by ARSCL as the
"CloudBaseBestEstimate" for boundary layer clouds. It was subsequently
determined that the BLC cloud base was biased, with the BLC reporting
cloud base heights that are 122 meters too high.

The bias error will be corrected when the entire ARSCL data set is
reprocessed as part of release_4.  (The release version number is included
the the netCDF global comments).   This reprocessing will also include a
small correction the the MMCR near-field reflectivities.  This correction
is less than 1 dB except for hydrometers within 200 meters of the surface.

Thanks to Roger Marchand for helping bracket this problem.
Measurements:sgparsclbnd1clothC1.c1:
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)

sgparsclcbh1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)

sgparscl1clothC1.c1:
  • MMCR Reflectivity(Reflectivity)
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
  • MMCR Best Estimate of Hydrometeor Reflectivity(ReflectivityBestEstimate)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)


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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:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0,
sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0
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:sgpmwrtipB1.a0:
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)

sgpmwrlosB1.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise diode mount temperature(tknd)

sgpmwrlosB4.a0:
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise diode mount temperature(tknd)
  • Ambient temperature(tkair)

sgpmwrlosB6.a0:
  • Noise diode mount temperature(tknd)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)

sgpmwrlosC1.b1:
  • Noise diode mount temperature(tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)

sgpmwrtipB6.a0:
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)

sgpmwrlosB1.a0:
  • Noise diode mount temperature(tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)

sgpmwrtipB4.a0:
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)

sgpmwrlosC1.a1:
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise diode mount temperature(tknd)
  • Ambient temperature(tkair)

sgpmwrlosB4.a1:
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise diode mount temperature(tknd)

sgpmwrlosB6.a1:
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise diode mount temperature(tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)


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

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

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

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

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

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

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

sgpmwrlosC1.b1:
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Mean total liquid water amount along LOS path(liq)
  • Mean total water vapor amount along LOS path(vap)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)

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

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

sgpmwrlosC1.a1:
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Mean total water vapor amount along LOS path(vap)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total liquid water amount along LOS path(liq)

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

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


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