DQRID : D941021.6
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/03/1994190009/15/19941330Incorrect
more
Subject:
SGP/EBBR/E12 - Low home_15 Values
DataStreams:sgp5ebbrE12.b1, sgp15ebbrE12.b1, sgp30ebbrE12.b1
Description:
The home signal values for the EBBR system installed at E12, Pawhuska, OK have
generally been lower than for the other EBBR systems.  However, during the
period above the home_15 value was often lower than 35, which is then
improperly interpreted by the CR10 software.  A home_15 value less than 35 is
interpreted as meaning that the AEM aspirated housings (which hold the
temperature and relative humidity sensors) are in the opposite orientation to
what they actually are.  The AEM continues to exchange properly, but the
resulting calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect.  On September 15, 1994 Site Operations personnel
refurbished the wiring for the left housing and the home_15 signal returned
to proper levels.

When 30 minute home_15 values are below 35, the data fields listed below are
incorrect.

5 minute:  home, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot

15 minute: mv_home

30 minute: home_15, tair_top, tair_bot, thum_top, thum_bot, hum_top,
           hum_bot, vp_top, vp_bot, Bowen, e, h

It is possible to recalculate the Bowen ratio, e, and h by using the 15
minute data to compute the correct gradients of temperature and relative
humidity (two 15 minute periods are averaged to give a half hour value); the
orientation of the AEM is obvious in the 15 minute data, based on the home
signal (which is largest for the first 15 minutes of the half hour).  More
information on performing this recalculation can be obtained from the
mentor.
Suggestions: 
Measurements:sgp15ebbrE12.b1:
  • home_signal
more
sgp5ebbrE12.b1:
  • rh_top_fraction
  • temp_trh_top
  • temp_air_top
  • home_signal
  • vapor_pressure_top
  • temp_air_bottom
  • rh_bottom_fraction
  • vapor_pressure_bottom
  • temp_trh_bottom
more
sgp30ebbrE12.b1:
  • latent_heat_flux
  • temp_air_bottom
  • rh_top_fraction
  • rh_bottom_fraction
  • bowen_ratio
  • vapor_pressure_top
  • temp_air_top
  • vapor_pressure_bottom
  • home_signal_15
  • sensible_heat_flux
  • temp_trh_bottom
  • temp_trh_top
more

Close this window