Data Quality Reports for Session: 118762 User: lindsay1m1 Completed: 04/07/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D080424.1SGP/EBBR/E18 - Soil Heat Flow #4 Offscale Low; Sensible and Latent Heat Flux Sometimes
Incorrect		sgp15ebbrE18.b1, sgp30ebbrE18.b1
D080702.2SGP/EBBR/E18 - SHF #4 Measurements Too Low; Sensible and Latent Heat Fluxes Suspectsgp15ebbrE18.b1, sgp30ebbrE18.b1


DQRID : D080424.1
Start DateStart TimeEnd DateEnd Time
04/15/2008003005/06/20082110
Subject:
SGP/EBBR/E18 - Soil Heat Flow #4 Offscale Low; Sensible and Latent Heat Flux Sometimes 
Incorrect
DataStreams:sgp15ebbrE18.b1, sgp30ebbrE18.b1
Description:
Soil heat flow #4 was sometimes lower than the lower limit imposed in the EBBR 
programming; sensible and latent heat flux were therefore deemed to be suspect during those times.  
The cause of the low values is not clear, but the values are not reasonable for the 
vegetation type at EF18.
Measurements:sgp30ebbrE18.b1:
  • 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
  • 5 cm soil heat flow, site 4(shf4)
  • latent heat flux(e)
  • soil heat flow, site 1(g1)
  • h(h)
  • soil heat flow, site 4(g4)
  • average surface soil heat flow(ave_shf)
sgp15ebbrE18.b1:
  • Soil heat flow 4(mv_hft4)

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DQRID : D080702.2
Start DateStart TimeEnd DateEnd Time
05/06/2008121506/17/20082120
Subject:
SGP/EBBR/E18 - SHF #4 Measurements Too Low; Sensible and Latent Heat Fluxes Suspect
DataStreams:sgp15ebbrE18.b1, sgp30ebbrE18.b1
Description:
Soil heat flow #4 was replaced at the beginning of this period.  However, the soil heat 
flow measurements from that sensor were sometimes still lower than the lower limit imposed 
in the EBBR programming; sensible and latent heat flux were therefore deemed to be 
suspect during those times.  The cause of the low values could not be determined, but the 
values are not reasonable for the vegetation type at EF18.  

To remedy the situation, the soil heat flow sensor calibration was changed so that the 
sensor provided measurements that resembled the other four soil heat flow sensor 
measurements.

Soil heat flow measurements have been reasonable since the calibration change.
Measurements:sgp30ebbrE18.b1:
  • 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
  • 5 cm soil heat flow, site 4(shf4)
  • latent heat flux(e)
  • h(h)
  • soil heat flow, site 4(g4)
  • average surface soil heat flow(ave_shf)
sgp15ebbrE18.b1:
  • Soil heat flow 4(mv_hft4)

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