DQRID : D070402.1
Start DateStart TimeEnd DateEnd Time
03/01/2007080008/29/20071730
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Subject:
SGP/ECOR/E21 - Intermittent incorrect flux measurements
DataStreams:sgp30ecorE21.b1
Description:
At various times during the period, the LI-7500 CO2/H2O serial and analog signals from the 
LI-7500 were missing, but usually not at the same time.

When the CO2/H2O serial datastream was missing, the Pressure and Temperature were missing; 
this did not, in itself, result in incorrect fluxes, as default values for pressure and 
temperature are automatically used.

Fluxes were incorrect when the CO2/H2O analog datastream was missing; these
times are identified by the qc checks.
Suggestions: 
Measurements:sgp30ecorE21.b1:
  • covariance wq(cvar_wq)
  • Covariance wc(cvar_wc)
  • CO2 flux(fc)
  • Atmospheric pressure(atm_pres)
  • Average temperature (IGRA internal sensor)(temp_irga)
  • latent heat flux(lv_e)
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