DQRID : D940909.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/20/1994023008/31/19941542Incorrect
more
Subject:
SGP/EBBR/E12 - Miscellaneous Problems Affecting Data
DataStreams:sgp5ebbrE12.b1, sgp30ebbrE12.b1, sgp15ebbrE12.b1
Description:
Three hardware problems occurred at E12, Pawhuska, OK in late August 1994.

On August 12 the wind direction sensor malfunctioned.  Therefore, all wind
direction, sigma, and resultant wind speed values for the period above are
incorrect.  The wind direction sensor was replaced on August 31.  Affected
data are:

        5 minute:  wind_d, sigma_wd, res_ws
        15 minute: mv_wind_d
        30 minute: wind_d, sigma_wd, res_ws.

Water accumulated in the AEM motor box and apparently caused a reduction in
the voltage level of the home signal (battery condition was very good and so
was not the cause); by late August 27 the hom30 level had fallen below the
minimum qc check level.  The AEM continued to exchange properly.  The minimum
qc level check is intended to help detect either a non-operating AEM or low
battery condition.  The Campbell CR10 software operates properly unless the
hom30 signal is thirty-five or greater.  So the low hom30 values do not
result in any incorrect data!!!.  I point this out because this situation
demonstrates a condition flagged by the qc checks, even though no effect on
the data has occurred.  The AEM box was dried out and new dessicant placed
in it on August 31.

On August 28, 1994 the left AEM housing ventilation fan ceased to operate
because of clogging of the ventilation system with debris.  Fifteen minute
data seems to indicate that the fan stopped operating just before 1245 GMT.
This is at least the third such incidence of clogging this summer at different
EBBRs.  The clog was removed and ventilation restored on August 31.  The lack
of ventilation caused improper measurements of temperature and
relative humidity in the left housing (these are quite obvious in the 15
minute data but difficult to detect in the 30 minute data) and therefore
incorrect values of sensible and latent heat.  Affected data are:

        5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top,
                   hum_bot, vp_top, vp_bot
        15 minute: rr_thum_l, mv_hum_l, tair_l
        30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top,
                   hum_bot, vp_top, vp_bot, bowen, e, h.
Suggestions: 
Measurements:sgp15ebbrE12.b1:
  • home_signal
  • temp_trh_left_rr
  • wdir_vec_mean_mv
  • temp_air_left
  • rh_left_mv
more
sgp5ebbrE12.b1:
  • rh_top_fraction
  • temp_trh_top
  • temp_air_top
  • vapor_pressure_top
  • temp_air_bottom
  • vapor_pressure_bottom
  • wspd_vec_mean
  • wdir_vec_mean
  • wdir_vec_std
  • rh_bottom_fraction
  • temp_trh_bottom
more
sgp30ebbrE12.b1:
  • temp_air_bottom
  • rh_top_fraction
  • bowen_ratio
  • sensible_heat_flux
  • wdir_vec_mean
  • latent_heat_flux
  • rh_bottom_fraction
  • vapor_pressure_top
  • temp_air_top
  • wspd_vec_mean
  • vapor_pressure_bottom
  • temp_trh_bottom
  • wdir_vec_std
  • home_signal_30
  • temp_trh_top
more

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