SGP/EBBR/E26 - Winds, SM2 Invalid data 10/10/93 - 2/2/94

Beginning October 10, 1993 the EBBR system at E26, Cement, OK began to have
problems with outputs from soil moisture sensor number 2 and the wind direction
sensor.  This situation also occured in early 1993 and was eliminated by
replacing the soil moisture sensor (after replacing the wind direction
sensor did not help).  This time, replacing the soil moisture sensor did
not help, but the problem has not re-occured since the wind direction
sensor was replaced on February 2, 1994.  During periods of bad data the
wind direction output is a constant 135 degrees and soil moisture two is
offscale.

Invalid data for a constant wind direction of 135 degrees is:

30 minute: res_ws, wind_d, sigma_wd

15 minute: mv_wind_d

5 minute: res_ws, wind_d, sigma_wd.

Invalid data for soil moisture 2 offscale is:

30 minute: sm2, c_shf2, cs2, ces2, g2, ave_shf, h, e

15 minute: r_sm2

5 minute: no data affected.

    Apparent cause of data loss, if known:   Apparently an electronic
    problem in interfacing an intermittently malfunctioning wind direction
    sensor to the data acquisition system multiplexer, thereby affecting
    the other sensor (soil moisture 2) on that multiplexer pair.

• Wind direction vector mean standard deviation(wdir_vec_std)
• Wind direction vector mean(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

• Soil moisture 2 (resistance)(soil_moisture_2_r)
• Wind direction vector mean (mV)(wdir_vec_mean_mv)

• Change in energy storage 2, 0-5 cm soil layer(energy_storage_change_2)
• Wind direction vector mean(wdir_vec_mean)
• Surface latent heat flux(latent_heat_flux)
• Soil heat capacity 2(soil_heat_capacity_2)
• Soil heat flow 2, corrected for soil moisture(corr_soil_heat_flow_2)
• Surface soil heat flux 2(surface_soil_heat_flux_2)
• Surface sensible heat flux(sensible_heat_flux)
• Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
• Soil moisture 2, gravimetric(soil_moisture_2)
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean standard deviation(wdir_vec_std)