Data Quality Reports for Session: 115583 User: sherman Completed: 11/08/2008


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030722.2SGP/SIRS/E21 - Shadowband Misalignmentsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D031009.2SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration CoefficientsgpsirsE21.00, sgpsirsE21.b1
D031020.4SGP/SIRS/E21 - Bird Poop Contaminationsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D040126.3SGP/SIRS/E21 - False signalsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D040229.2SGP/SIRS/E21 - Shadowband Misalignmentsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D040329.1SGP/SIRS/E21 - Instrument logger time problem, Unknownsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D040601.1SGP/SIRS/E21 - Dirt on domesgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D060424.1SGP/SIRS/E21 - Roosting birds in field of viewsgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
D060630.27SGP/SIRS/E21 - Reprocessed: Longwave Calibration errorsgpsirsE21.b1


DQRID : D030722.2
Start DateStart TimeEnd DateEnd Time
07/17/2003100008/06/20031350
Subject:
SGP/SIRS/E21 - Shadowband Misalignment
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
Solar tracker stopped functioning on 7/17. Tracker power cycled on 
              07/24 and returned to normal tracking but failed again 7/25.  Power
              was cycled again 8/6 and tracker performance was sustained thereafter.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_shaded_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)


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DQRID : D031009.2
Start DateStart TimeEnd DateEnd Time
07/23/2003133008/08/20031650
Subject:
SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient
DataStreams:sgpsirsE21.00, sgpsirsE21.b1
Description:
Incorrect coefficients were applied to the upwelling longwave radiation
measurement instrument (i.e. pyrgeometer, SIRS acroynm "UIR") during
this time period.

For a PIR mounted in an upwelling measurement orientation (UIR), the
thermopile output is extremely low compared to a downwelling PIR (DIR).
In addition, the UIR case and dome temperature differences are much
smaller than a DIR.  This results in the pyrgeometer receiver radiation 
term, Wr (NREL/Hickey equation) or Wc (Albrecht/Cox equation), dominating
all other terms of the infrared radiant flux equation.

Since the receiver radiation term uses coefficients in both forms of
the pyrgeometer equations nearly equal to 1.0 +- <1% the result is a
measurement of incoming longwave radiant flux relatively insensitive 
to the installed instrument - so long as it is an Eppley PIR.
                
Evaluation of the problem data shows the expected error of the data
(before correction) will be within 1% - less than the uncertainty of 
the instrument (Eppley PIR greater of 5% or 5 W/m2)
                
To correct the one minute data found in the a1 or b1 datastream follow
this procedure:
1) Obtain the following variables from the b1 datafile:
         inst_up_long_dome_temp
         inst_up_long_case_temp
         up_long_netir

2) For each one minute data entry in b1
     tpUIR[uV] = up_long_netir[uV]/0.2523876[W/m2/uV]

3) Apply for each one minute data entry:

WinUIR(W/m2)=k*V+ Sigma*Tc^4 -4*Sigma*(Td^4 - Tc^4)
            =[0.28902*tpUIR]+[Sigma*inst_up_long_case_temp^4]
              -[4*Sigma*(inst_up_long_dome_temp^4-inst_up_long_case^4)]

where, Sigma =  5.6697E-8 (Stefan-Boltzman Const)
                
Other datastream corrections that use the UIR measurements will require
similar corrections.


See the following web site for additional information on the pyrgeometer
equations, specifically sections 2.1(Single Calibration Factor Approach)
and 2.2 (Four Coefficient Calibration Approach)

      http://www.arm.gov/docs/instruments/static/pyrg.html
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirsE21.b1:
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(up_long_hemisp_max)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Standard
    Deviation(up_long_hemisp_std)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)


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DQRID : D031020.4
Start DateStart TimeEnd DateEnd Time
10/18/2003160010/29/20031630
Subject:
SGP/SIRS/E21 - Bird Poop Contamination
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
Downwelling shortwave values were erratic during the day on 10/18 and in very poor 
agreement at times with downwelling shortwave values calculated from direct and diffuse 
measurements. Bi-weekly preventative maintenace records indicate bird poop was cleaned from the 
downwelling shortwave instrument on 10/29 at 16:30.  Review of maintenance records and 
instrument data indicate no bird contamination since 10/29.

Turkey vultures are the usual suspects in data quality problems at this facility. The 
RBD(rotating bird deterrent) had failed the week of 10/13 and is awaiting parts.  However, 
beginning in late October the birds had left the site.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)


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DQRID : D040126.3
Start DateStart TimeEnd DateEnd Time
10/19/2003000002/26/20042359
Subject:
SGP/SIRS/E21 - False signal
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
During clear-sky conditions, downwelling shortwave values spike downward approximately 50 
to 200 W/m^2 around 22:15 UTC for about 15 minutes. This problem occurs at about the same 
time for the same duration each day during the indicated period of the year.  This 
effect is due to a shadow from the Rotating Bird Deterrent (RBD) installed earlier in the year 
to prevent extensive bird droppings at the site.  The RBD is installed at such a 
location that it will partially shade the downwelling shortwave PSP from 19 October to 23 
February of the year.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)


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DQRID : D040229.2
Start DateStart TimeEnd DateEnd Time
02/20/2004130003/03/20041300
Subject:
SGP/SIRS/E21 - Shadowband Misalignment
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
The NIP reported values close to zero and downwelling shortwave global and diffuse were 
equivalent due to tracker failure.  

Maintenance replaced tracker 2/27, but couldn't replace instruments until 03/02 2000 GMT 
due to bird poop contamination.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)

sgpsirsE21.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)


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DQRID : D040329.1
Start DateStart TimeEnd DateEnd Time
03/21/2004120003/24/20040200
Subject:
SGP/SIRS/E21 - Instrument logger time problem, Unknown
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
Values of diffuse hemispheric shortwave radiation differ from derived values by at most 70 
Wm^(-2).  The incident appears to be isolated to 3/21, 3/22, and 3/23. An estimation of 
solar noon using downwelling shortwave hemispheric irradiance from the PSP shows solar 
noon to oocur at around 1845GMT on 3/21. Calculated solar noon occurs at E21 at 1831GMT for 
3/21/2004.  There appears to be a time discrepancy in the datalogger for these dates.  
04/01 is the next date with enough sun to determine solar noon and compare to calculated.  
The data from this date appears correct.  Ronald Reed [rreed@ops.sgp.arm.gov] reports 
the logger did not receive any reportable time updates during the late March time period.  
We don't know what happened during these three dates but from 3/24 on data looks acceptable.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Time offset of tweaks from base_time(time_offset)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_case_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_dome_resist)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
  • Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Upwelling Pyrgeometer Thermopile(inst_up_long_hemisp_tp)
  • Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Minima(up_short_hemisp_min)
  • Instantaneous Dome Temperature(inst_up_long_dome_temp)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Time offset of tweaks from base_time(time_offset)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
    Pyrgeometer(inst_down_long_shaded_case_temp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
    Pyrgeometer(inst_down_long_shaded_dome_temp)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(up_long_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Standard
    Deviation(up_short_hemisp_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_shaded_std)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Instantaneous Case Temperature(inst_up_long_case_temp)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Standard
    Deviation(up_long_hemisp_std)


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DQRID : D040601.1
Start DateStart TimeEnd DateEnd Time
05/28/2004150006/09/20041342
Subject:
SGP/SIRS/E21 - Dirt on dome
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
Measured downwelling shortwave values differed from calculated 
              (direct + diffuse) by +/-100 W/m^2 in the afternoon.  Pattern of
              differences is indicative of a dirty downwelling shortwave dome.
              Maintenance on 6/9 cleaned water spots on the dome.  Other 
              downwelling instruments may have also been dirty during this 
              period.
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)


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DQRID : D060424.1
Start DateStart TimeEnd DateEnd Time
04/07/2006120005/31/20061700
Subject:
SGP/SIRS/E21 - Roosting birds in field of view
DataStreams:sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1
Description:
The RBDD (Rotating Bird Deterrent Device) installed at E21 to prevent turkey vultures from 
roosting on the instrument boom failed resulting in noisy NIP (Short Direct Normal) and 
PSP (Short Global Hemispheric) data and a spike occurring around 2230 UTC everyday due to 
obstruction of the field of view.

Problem is intermittant due to moving birds.  Use data with discretion.  Follow ARM 
(DQMS3) flag recommendations for QC flags 02 or 03 found in section 5.1.4 of the SIRS handbook:
http://www.arm.gov/publications/tech_reports/handbooks/sirs_handbook.pdf
Measurements:sgpsirsE21.00:
  • null(Raw data stream - documentation not supported)

sgpsirs20sE21.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)

sgpsirsE21.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)


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DQRID : D060630.27
Start DateStart TimeEnd DateEnd Time
07/23/2003152002/15/20061515
Subject:
SGP/SIRS/E21 - Reprocessed: Longwave Calibration error
DataStreams:sgpsirsE21.b1
Description:
Modified pyrgeometer calibration procedures were implemented beginning in July 2003. These 
modified procedures introduced a calibration bias in the longwave data. The previous 
procedures were re-implemented at all sites between December 2005 and February 2006 to 
restore proper calibrations. 

The data collected while the incorrect procedures were in place have been reprocessed to 
remove the calibration bias.  The reprocessed 60 second averaged data are based on 3 
instantaneous 20 second data records rather than on 60 1 second instantaneous data records. 
Still, these data are considered far superior to the originally processed data. The 
reprocessed data were archived in November 2006.
Measurements:sgpsirsE21.b1:
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)


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END OF DATA