Data Quality Reports for Session: 181311 User: jumah1 Completed: 11/16/2016

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D040217.2SGP/CO2FLX/C1 - Reprocessing User Notessgp30co2flx4mC1.b1Does not affect quality
D041026.1SGP/CO2FLX/C1 - Reprocess: Unitssgp30co2flx4mC1.b1Does not affect quality
D060107.1SGP/CO2FLX/C1 - Reprocess: calibration errorsgp30co2flx4mC1.b1Suspect
D070803.2SGP/CO2FLX/C1 - Disturbance around sitesgp30co2flx4mC1.b1Incorrect
D071011.2SGP/CO2FLX/C1 - Reprocessing Notice (RID 432)sgp30co2flx4mC1.b1Does not affect quality
D081202.1SGP/CO2FLX/C1 - Reprocessed: Recalibrationsgp30co2flx4mC1.b1Does not affect quality


DQRID : D040217.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/18/2002000002/17/20040000Does not affect quality
Subject:
SGP/CO2FLX/C1 - Reprocessing User Notes
DataStreams:sgp30co2flx4mC1.b1
Description:
Format Changes:
  To comply with archive standards, the name of the unlimited dimention variable in the 
cdf level b1 files was changed from 'record' to 'time'. This does not affect data quality.
Measurements:sgp30co2flx4mC1.b1:
  • site_elevation
  • yyyydddhhmmss
  • WPL corrected CO2 flux(fc_corr)
  • Mean sonic temp(mean_t)
  • Additive WPL H correction to fc(fc_wpl_h)
  • Mean H2O density(mean_q)
  • mean_p
  • phi
  • Mean horizontal wind speed(mean_rot_u)
  • doy
  • Monin-Obukhov length scale(Lmoni)
  • Wind direction, at 10-m height, 30-min intervals(wdir)
  • WPL LE correction to fc(fc_wpl_le)
  • variance of variable t(var_t)
  • friction velocity(ustar)
  • time_offset
  • Mean CO2 density(mean_c)
  • site_latitude
  • base_time
  • rotated variance w(var_rot_w)
  • rotated variance v(var_rot_v)
  • Variance of q(var_q)
  • Variance of rotated u(var_rot_u)
  • site_longitude
  • Variance of co2 density(var_c)
  • zm
  • Corrected sensible heat flux(h)
  • WPL corrected latent heat flux(le)
  • theta

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DQRID : D041026.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/18/2002000010/12/20042359Does not affect quality
Subject:
SGP/CO2FLX/C1 - Reprocess: Units
DataStreams:sgp30co2flx4mC1.b1
Description:
Mean CO2 density units are incorrectly labeled as umol m-3. Units should be labeled as 
mmol m-3.
Measurements:sgp30co2flx4mC1.b1:
  • Mean CO2 density(mean_c)

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DQRID : D060107.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/27/2005000001/06/20062359Suspect
Subject:
SGP/CO2FLX/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:
  • Mean H2O density(mean_q)
  • WPL corrected CO2 flux(fc_corr)
  • WPL corrected latent heat flux(le)

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DQRID : D070803.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/24/2007130007/26/20072359Incorrect
Subject:
SGP/CO2FLX/C1 - Disturbance around site
DataStreams:sgp30co2flx4mC1.b1
Description:
A bulldozer used to excavate the SGP Tower anchors was right around (within 10 feet) our 
systems.
Measurements:sgp30co2flx4mC1.b1:
  • WPL corrected CO2 flux(fc_corr)
  • Mean CO2 density(mean_c)

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DQRID : D071011.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/17/2003000010/11/20070000Does not affect quality
Subject:
SGP/CO2FLX/C1 - Reprocessing Notice (RID 432)
DataStreams:sgp30co2flx4mC1.b1
Description:
See below for details of reprocessing that was completed on 20141217.  Original DQR 
category: 5 (Transparent - Does not affect quality).

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The height of the 4m instruments is 4.8 m and not 4.65 m as shown in b1 datastream
Measurements:sgp30co2flx4mC1.b1:
  • zm

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DQRID : D081202.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/26/2005000001/11/20062359Does not affect quality
Subject:
SGP/CO2FLX/C1 - Reprocessed: Recalibration
DataStreams:sgp30co2flx4mC1.b1
Description:
The 4m CO2 flux system was calibrated on May 25, 2005. After the calibration was 
performed, calibration coefficients used to measure CO2 density were not updated. This added an 
OFFSET to the CO2 density measurements.

The data have been reprocessed to address the offset.  The reprocessed data were archived 
in December 2008. Please retrieve the updated files for use in your analysis.
Measurements:sgp30co2flx4mC1.b1:
  • Mean CO2 density(mean_c)

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