DQRID : D940511.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/06/1994151505/06/19941600Incorrect
more
Subject:
SGP/EBBR/E13 - SM4 Replacement
DataStreams:sgp30ebbrE13.b1, sgp15ebbrE13.b1
Description:
Soil Moisture Probe #4 has been indicating large soil moistures in the past
couple of months.  At times the values have exceeded the upper limit of the
acceptable range.  This data could be considered questionable, although the
affect on average soil moisture and quantities affected by it is very small.
Therefore, I do not suggest additional flagging of the data other than that
imposed by the limits.  The probe was changed from S/N 92004 to 93004 on
May 6, 1994 at 1530 GMT.  During the exchange process a few selected periods
of soil moisture #4 data is incorrect, but not so different from the other
soil moisture probes as to have a significant affect on the average soil
moisture or the fluxes.

Additionally, the EBBR output was interrupted for a half hour while the
calibration of the new probe was entered into the CR10 data logger.
Therefore, all 5 minute data from 1535 to 1600 GMT, 15 minute data for 1545
and 1600 GMT, and 30 minute data for 1600 GMT is incorrect.

Furthermore, disturbance of the area near the #4 soil probes (temperature,
soil moisture, and heat flux) caused all three to be incorrect for the
following periods:

30 minute  1530 GMT

15 minute  1515 and 1530 GMT

5 minute   1515, 1520, 1525, and 1530 GMT.

Complete recovery by all three sensors did not occur for one day (which is
fairly typical for near surface installations), although the differences
from the other four sets of soil sensors did not deleteriously affect the
averages of the soil quantities.
Suggestions: 
Measurements:sgp15ebbrE13.b1:
  • soil_moisture_4_r
  • soil_heat_flow_4_mv
  • temp_air_right
  • temp_air_left
  • soil_temp_4_rr
more
sgp30ebbrE13.b1:
  • sensible_heat_flux
  • soil_heat_flow_4
  • soil_temp_4
  • soil_temp_3
  • soil_temp_2
  • latent_heat_flux
  • soil_moisture_4
  • corr_soil_heat_flow_4
more

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