Data Quality Reports for Session: 115591 User: sherman Completed: 11/09/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060630.11SGP/SIRS/E3 - Reprocessed: Longwave Calibration errorsgpsirsE3.b1
D060630.12SGP/SIRS/E4 - Reprocessed: Longwave Calibration errorsgpsirsE4.b1
D060703.1SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficientssgpsirs20sE3.a0, sgpsirsE3.b1
D070411.1SGP/SIRS/E3 - Instrument leveling and tracker problemsgpsirs20sE3.a0, sgpsirsE3.b1


DQRID : D060630.11
Start DateStart TimeEnd DateEnd Time
03/10/2004171502/08/20061730
Subject:
SGP/SIRS/E3 - Reprocessed: Longwave Calibration error
DataStreams:sgpsirsE3.b1
Description:
Modified pyrgeometer calibration procedures were implemented beginning in March 2004. 
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 August 2006.
Measurements:sgpsirsE3.b1:
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)

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DQRID : D060630.12
Start DateStart TimeEnd DateEnd Time
03/10/2004172002/22/20061615
Subject:
SGP/SIRS/E4 - Reprocessed: Longwave Calibration error
DataStreams:sgpsirsE4.b1
Description:
Modified pyrgeometer calibration procedures were implemented beginning in March 2004. 
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 October 2006.
Measurements:sgpsirsE4.b1:
  • 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)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)

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DQRID : D060703.1
Start DateStart TimeEnd DateEnd Time
06/14/2006161207/12/20061830
Subject:
SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficients
DataStreams:sgpsirs20sE3.a0, sgpsirsE3.b1
Description:
No data were collected from 6/7/2006 0000 to 6/14/2006 1612 due to hardware problems.  
When data resumed on 6/14, ALL calibration coefficients and serial numbers were for 
different instruments possibly due to incorrect program loaded on storage module.  Correct 
program reloaded by PM/CM techs on 7/12 1830GMT

Shortwave data can be corrected with a simple multiplier as shown below.  Longwave data 
must be reprocessed from temperature and netIR data.

The data can be recalibrated as follows:
First divide value by incorrectly applied cal coeff (first number) then multiply by 
correct cal coeff (second number). 
  down_short_diffuse_hemisp	109.52	110.31
  up_short_hemisp		111.61	109.80
  short_direct_normal		115.73	118.82
  down_short_hemisp		122.47	117.34
  up_long_netir 		0.26525 0.2564
  down_long_netir		0.27173	0.2695

Reapply cal coeffs below using up_long_netIR(uV), inst_up_long_dome_temp(K),  
inst_up_long_dome_temp(K) using procedure described in SIRS instrument manual.
  up_long_hemisp
	k0	0.00 W/m^2
	k1	0.2564 W/(m^2*uV)
	k2	1.00 unitless
	k3	-4.00 unitless
	kr	0.000 K/uV

Reapply cal coeffs below using down_long_netIR(uV),inst_down_long_dome_temp
(K),inst_down_long_dome_temp(K).
  down_long_hemisp_shaded	
	k0	0.00 W/m^2
	k1	0.2695 W/(m^2*uV)
	k2	1.00 unitless
	k3	-4.00 unitless
	kr	0.000 K/uV
Measurements:sgpsirs20sE3.a0:
  • Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_case_resist)
  • Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
  • Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_dome_resist)
  • 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)
sgpsirsE3.b1:
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Minima(up_long_hemisp_min)
  • Instantaneous Case Temperature(inst_up_long_case_temp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Instantaneous Dome Temperature(inst_up_long_dome_temp)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Minima(up_short_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
    Pyrgeometer(inst_down_long_shaded_case_temp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_shaded_std)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Standard
    Deviation(up_long_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_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 Net Infrared(down_long_netir)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Standard
    Deviation(up_short_hemisp_std)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
    Pyrgeometer(inst_down_long_shaded_dome_temp)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer, Maxima(up_long_hemisp_max)

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DQRID : D070411.1
Start DateStart TimeEnd DateEnd Time
10/23/2006000004/18/20071820
Subject:
SGP/SIRS/E3 - Instrument leveling and tracker problem
DataStreams:sgpsirs20sE3.a0, sgpsirsE3.b1
Description:
Asymmetry between measured downwelling shortwave and derived downwelling shortwave 
hemispheric in the afternoon began late in fall and became more apparent as the sun moved higher 
in spring.  This can happen when the PSP is unlevel or when the NIP is not tracking well. 

The PSP level was corrected and the clock on tracker was reset.  Mentor suspects PSP was 
unlevel during this time range causing the discrepancy in measured vs. calculated 
downwelling shortwave hemispheric data.
Measurements:sgpsirs20sE3.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
sgpsirsE3.b1:
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_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,
    Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • 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, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)

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