Data Quality Reports for Session: 103588 User: borr Completed: 01/09/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D051116.2SGP/CO2/C1 - downwelling longwave hemispheric irradiance incorrectsgp30co2flx4mmetC1.b1
D051116.3SGP/CO2/C1 - Soil Temperature measurementssgp30co2flx4mmetC1.b1
D060107.1SGP/CO2/C1 - Reprocess: calibration errorsgp30co2flx4mC1.b1


DQRID : D051116.2
Start DateStart TimeEnd DateEnd Time
04/28/2004190011/16/20050000
Subject:
SGP/CO2/C1 - downwelling longwave hemispheric irradiance incorrect
DataStreams:sgp30co2flx4mmetC1.b1
Description:
A problem was identified with the downwelling longwave hemispheric irradiance (variable 
"r_down_long_hemisp") calibration of our Kipp & Zonen CNR1 radiometer. The offset of the 
instrument is believed to be incorrect over the specified time frame, and a correction of 
the problem is underway.
Measurements:sgp30co2flx4mmetC1.b1:
  • downwelling longwave hemispheric irradiance t_rad corrected(r_down_long_hemisp)


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DQRID : D051116.3
Start DateStart TimeEnd DateEnd Time
12/18/2002000011/16/20050000
Subject:
SGP/CO2/C1 - Soil Temperature measurements
DataStreams:sgp30co2flx4mmetC1.b1
Description:
Current data quality check (qc) procedure does not catch spikes in soil temperature 
measurements. A new qc procedure is being tested and will improve the current procedure.
Measurements:sgp30co2flx4mmetC1.b1:
  • average of two lower soil temperature sensors(mean_t_soil_lower)
  • average of two middle soil temperature sensors(mean_t_soil_middle)
  • average of two upper soil temperature sensors(mean_t_soil_upper)


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DQRID : D060107.1
Start DateStart TimeEnd DateEnd Time
05/27/2005000001/06/20062359
Subject:
SGP/CO2/C1 - Reprocess: calibration error
DataStreams:sgp30co2flx4mC1.b1
Description:
A problem was identified with the calibration of the instrument performed on May 27, 2005. 
A study to correct this bad calibration is underway.
Measurements:sgp30co2flx4mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • mean water vapor concentration (q)(mean_q)
  • WPL corrected latent heat flux(le)


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