DQRID : D941212.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/07/1994043012/07/19940800Incorrect
more
Subject:
SGP/EBBR/E26 - Wind Direction Sensor Affect on Soil Moisture 2
DataStreams:sgp30ebbrE26.b1, sgp5ebbrE26.b1, sgp15ebbrE26.b1
Description:
I have written a number of previous PIFs and DQRs about this same problem
previously.  This occurred most recently at E9, Ashton, KS in August 1994.
The wind direction sensor is on the same data acquisition system multiplexer
pair as soil moisture sensor 2.  Sometimes a malfunctioning wind direction
sensor (resulting in a constant wind direction of 135 degrees) will cause the
soil moisture 2 measurement to be offscale.  Between 0430 and 0800 GMT the wind
direction sensor did not function properly at E22, Cordell, KS.  As has often
been the case, soil moisture measurements were affected for a shorter time
period, from 0500 through 0730 GMT.  The cause of this problem is unknown and
only occurs on the multiplexer pair to which the wind direction sensor is
connected, not on any other pair to which a soil moisture sensor is attached.
None of the manufacturers of the applicable equipment can explain the
problem.  As done before, I will monitor the data for further occurrences
of this condition; if the frequency of occurrence increases, further action
will be taken.

The following data and times are incorrect:

Winds: 0430-0800 GMT

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

Soil Moisture 2: 0500-0730 GMT

15 minute: r_sm2
30 minute: sm2, c_shf2, cs2, ces2, g2, ave_shf, h, e
Suggestions: 
Measurements:sgp5ebbrE26.b1:
  • wdir_vec_mean
  • wspd_vec_mean
  • wdir_vec_std
more
sgp15ebbrE26.b1:
  • soil_moisture_2_r
  • wdir_vec_mean_mv
more
sgp30ebbrE26.b1:
  • corr_soil_heat_flow_2
  • surface_soil_heat_flux_2
  • energy_storage_change_2
  • latent_heat_flux
  • surface_soil_heat_flux_avg
  • soil_moisture_2
  • soil_heat_capacity_2
more

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