Data Quality Reports for Session: 129328 User: cgueymard Completed: 07/31/2010

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020426.6SGP/TSI/C1 - sampling rate changesgptsiskycoverC1.a1, sgptsiskycoverC1.b1
D030130.3SGP/TSI/C1 - Metadata Errors in NetCDF HeadersgptsiskycoverC1.a1, sgptsiskycoverC1.b1
D030312.10SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperaturessgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
D040526.1SGP/TSI/C1 - Metadata errorssgptsiskycoverC1.a1, sgptsiskycoverC1.b1
D050502.2SGP/SIRS/C1 - SWFANAL Data description errorsgp15swfanalsirs1longC1.c1, sgp1swfanalsirs1longC1.c1
D050502.3SGP/BRS/C1 - SWFANAL Data description error sgp15swfanalbrs1longC1.c1, sgp1swfanalbrs1longC1.c1


DQRID : D020426.6
Start DateStart TimeEnd DateEnd Time
07/02/2000003504/26/20020018
Subject:
SGP/TSI/C1 - sampling rate change
DataStreams:sgptsiskycoverC1.a1, sgptsiskycoverC1.b1
Description:
SGP TSI-880 sampling rate changed from 20-second to
30-second at 20020426.001900 UTC (20020425.1819 SGP
CF local time) per ECR-00226 and BCR-00491.

This change brings all ARM TSIs to the same operational
sampling rate.  Daily SGP TSI data volume will decrease
by about 1/3 due to this change.
Measurements:sgptsiskycoverC1.a1:
  • Pixel count: camera and sun strip mask(count.mask)
  • base time(base_time)
  • Pixel count: number thin in zenith circle(region.zenith.count.thin)
  • Pixel count: number thin in sun circle(region.sun.count.thin)
  • Pixel count: number total thin(count.thin)
  • Pixel count: number total in zenith circle(region.zenith.count)
  • Pixel count: number opaque in sun circle(region.sun.count.opaque)
  • Pixel count: number below horizon in image(count.sub.horz)
  • Pixel count: number total opaque(count.opaque)
  • Pixel count: box, outside mirror area(count.box)
  • Dummy altitude for Zeb(alt)
  • Pixel count: number opaque in zenith circle(region.zenith.count.opaque)
  • Sunshine meter(sunny)
  • Pixel count: number total in processed circle(count.sky)
  • Sun altitude above horizon(solar.altitude)
  • Percentage thin cloud(percent.thin)
  • Pixel count: number total between horizon and processed circle(count.sub.proczen)
  • Pixel count: number total in sun circle(region.sun.count)
  • Pixel count: number opaque in horizon area(region.horizon.count.opaque)
  • Percent opaque cloud(percent.opaque)
  • lon(lon)
  • Pixel count: number total indeterminant(count.unknown)
  • Time offset of tweaks from base_time(time_offset)
  • Solar azimuth angle(solar.azimuth)
  • Relative \'strength\' of direct sun(sun.strength)
  • Pixel count: number total in horizon area(region.horizon.count)
  • Pixel count: number thin in horizon area(region.horizon.count.thin)
  • lat(lat)
sgptsiskycoverC1.b1:
  • Pixel count: number opaque in horizon area(region.horizon.count.opaque)
  • Sun altitude above horizon(solar.altitude)
  • Pixel count: camera and sun strip mask(count.mask)
  • Pixel count: number total indeterminant(count.unknown)
  • Pixel count: number total in zenith circle(region.zenith.count)
  • Pixel count: number total between horizon and processed circle(count.sub.proczen)
  • lat(lat)
  • Pixel count: number opaque in zenith circle(region.zenith.count.opaque)
  • Pixel count: number total in processed circle(count.sky)
  • Pixel count: number opaque in sun circle(region.sun.count.opaque)
  • Pixel count: number below horizon in image(count.sub.horz)
  • Percentage thin cloud(percent.thin)
  • Sunshine meter(sunny)
  • Pixel count: number total in sun circle(region.sun.count)
  • Pixel count: box, outside mirror area(count.box)
  • Pixel count: number thin in zenith circle(region.zenith.count.thin)
  • Pixel count: number total opaque(count.opaque)
  • Pixel count: number thin in sun circle(region.sun.count.thin)
  • lon(lon)
  • Solar azimuth angle(solar.azimuth)
  • Pixel count: number total in horizon area(region.horizon.count)
  • Pixel count: number thin in horizon area(region.horizon.count.thin)
  • Dummy altitude for Zeb(alt)
  • Pixel count: number total thin(count.thin)
  • base time(base_time)
  • Percent opaque cloud(percent.opaque)
  • Relative \'strength\' of direct sun(sun.strength)
  • Time offset of tweaks from base_time(time_offset)

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DQRID : D030130.3
Start DateStart TimeEnd DateEnd Time
07/02/2000003501/21/20032359
Subject:
SGP/TSI/C1 - Metadata Errors in NetCDF Header
DataStreams:sgptsiskycoverC1.a1, sgptsiskycoverC1.b1
Description:
The value of "sample_int" reported in the netCDF header is
incorrect.  The correct sampling interval is 30 seconds.

The maximum values for the variable "sunny" is incorrect.  
It should be 1, not 100 as documented in the netCDF header. 
Users should disregard the "qc_sunny" flag during this
period of time and apply their own qc check if desired.

The minimum value for the variable "solar.altitude" is
incorrect. It should be -90, not 10 as documented in the
netCDF header.  Users should disregard the "qc_solar.altitude"
flag during this period of time and apply their own qc check
if desired.
Measurements:sgptsiskycoverC1.a1:
  • Time offset of tweaks from base_time(time_offset)
sgptsiskycoverC1.b1:
  • Sunshine meter(sunny)
  • Sun altitude above horizon(solar.altitude)
  • Time offset of tweaks from base_time(time_offset)

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DQRID : D030312.10
Start DateStart TimeEnd DateEnd Time
11/17/1999180007/31/20022034
Subject:
SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures
DataStreams:sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1
Description:
Several related and recurring problems with the SGP MWRs have been
reported dating back to 1999.  These problems were due to the
occurrence of blackbody signals (in counts) that were half of those
expected. The symptoms included noisy data (especially at Purcell),
spikes in the data (especially at Vici), negative brightness
temperatures, and apparent loss of serial communication between the
computer and the radiometer, which results in a self-termination of the
MWR program (especially at the CF).

Because these all initially appeared to be hardware-related problems,
the instrument mentor and SGP site operations personnel (1) repeatedly
cleaned and replaced the fiber optic comm. components, (2) swapped
radiometers, (3) sent radiometers back to Radiometrics for evaluation
(which has not revealed any instrument problems), and (4) reconfigured
the computer's operating system.  Despite several attempts to isolate
and correct it, the problem persisted.

It became apparent that some component of the Windows98 configuration
conflicted with the DOS-based MWR program or affected the serial port
or the contents of the serial port buffer. This problem was finally
corrected by upgrading the MWR software with a new Windows-compatible
program.
Measurements:sgp5mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgp1mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
sgpmwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)

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DQRID : D040526.1
Start DateStart TimeEnd DateEnd Time
07/02/2000003505/05/20032359
Subject:
SGP/TSI/C1 - Metadata errors
DataStreams:sgptsiskycoverC1.a1, sgptsiskycoverC1.b1
Description:
The latitude, longitude and altitude of the Total Sky Imager 
(TSI) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 TSI is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m
Measurements:sgptsiskycoverC1.a1:
  • Dummy altitude for Zeb(alt)
  • lon(lon)
  • lat(lat)
sgptsiskycoverC1.b1:
  • lon(lon)
  • Dummy altitude for Zeb(alt)
  • lat(lat)

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DQRID : D050502.2
Start DateStart TimeEnd DateEnd Time
03/25/1997000012/10/20032359
Subject:
SGP/SIRS/C1 - SWFANAL Data description error
DataStreams:sgp15swfanalsirs1longC1.c1, sgp1swfanalsirs1longC1.c1
Description:
The long name attribute for the cloud effect fields incorrectly
defines the cloud effect to be the difference between the 
clearskyfit and measured values:

"Difference: ***fluxdn_clearskyfit - ***fluxdn_measured (***fcg)" ;

The cloud effects are correctly calculated by subtracting the 
irradiance calculated in the clear sky fit from the measured 
irradiance.

"Difference: ***fluxdn_measured - ***fluxdn_clearskyfit (***fcg)" ;

NOTE: this is just a documentation error.  The data are correctly
calculated.
Measurements:sgp1swfanalsirs1longC1.c1:
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
sgp15swfanalsirs1longC1.c1:
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)

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DQRID : D050502.3
Start DateStart TimeEnd DateEnd Time
04/01/2001000012/10/20032359
Subject:
SGP/BRS/C1 - SWFANAL Data description error
DataStreams:sgp15swfanalbrs1longC1.c1, sgp1swfanalbrs1longC1.c1
Description:
The long name attribute for the cloud effect fields incorrectly
defines the cloud effect to be the difference between the 
clearskyfit and measured values:
   
"Difference: ***fluxdn_clearskyfit - ***fluxdn_measured (***fcg)" ;
   
The cloud effects are correctly calculated by subtracting the
irradiance calculated in the clear sky fit from the measured 
irradiance.
   
"Difference: ***fluxdn_measured - ***fluxdn_clearskyfit (***fcg)" ;
   
NOTE: this is just a documentation error.  The data are correctly
calculated.
Measurements:sgp15swfanalbrs1longC1.c1:
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
sgp1swfanalbrs1longC1.c1:
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)

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