DQRID : D960502.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/01/1995000005/08/19961755Suspect
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Subject:
SGP/EBBR/E20 - Temperature/RH Probes Malfunction and Replacement
DataStreams:sgp15ebbrE20.b1, sgp5ebbrE20.00, sgp5ebbrE20.b1, sgp30ebbrE20.b1
Description:
Beginning on approximately October 1, 1996 the calibration of the temperature 
sensor in one or both T/RH probes began to drift; temperatures started to 
drift higher than the thermocouple probes.  This drift caused the upper and 
lower temperatures measured by the T/RH probe to be 2 to 10 degrees C greater 
than the thermocouple probes.  Comparison with adjacent EBBR sites shows 
that the thermocouples were measuring properly.  The problem affected the vapor 
pressure outputs primarily, making them as much as 1 kPa greater than they 
should be (vapor pressure is calculated from probe temperature and relative 
humidity).  The effect on sensible and latent heat fluxes was negligible, 
although latent heat flux may be overestimated by about 5% presently and 
sensible heat flux underestimated by approximately the same percentage.


Site operations replaced the T/RH probes on 8 May 1996; the new probes are 
performing well. The serial numbers of replaced probes are: Left 632415, 
Right 632356.  New probe serial numbers are: Left 460428, Right 460412.
Suggestions: 
Measurements:sgp30ebbrE20.b1:
  • temp_trh_bottom
  • vapor_pressure_bottom
  • sensible_heat_flux
  • bowen_ratio
  • vapor_pressure_top
  • latent_heat_flux
  • temp_trh_top
more
sgp15ebbrE20.b1:
  • temp_trh_right_rr
  • temp_trh_left_rr
more
sgp5ebbrE20.00:
  • Raw data stream - documentation not supported
more
sgp5ebbrE20.b1:
  • temp_trh_top
  • vapor_pressure_bottom
  • temp_trh_bottom
  • vapor_pressure_top
more

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