SGP/MET/E9 - Wind Speed Data Incorrect

Wind speed sensor reference wire became detached.  This caused all wind sensor data to 
report near 0 m/s.

• Wind speed vector mean(wspd_vec_mean)
• qc_wspd_vec_mean
• qc_wspd_arith_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - Time-stamp uncertainty

Between 20100503 and 20100507 the sgp.E9 instruments (EBBR, MET, SIRS, SWATS) time clocks 
were drifting outside the allowable +/-3 seconds.  During the specified period, the 
swings ranged from -326 to +637 seconds.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• qc_wdir_vec_mean
• qc_temp_mean
• Wind speed vector mean(wspd_vec_mean)
• qc_wdir_vec_std
• Wind direction vector mean(wdir_vec_mean)
• Atmospheric pressure(atmos_pressure)
• qc_wspd_vec_mean
• qc_rh_mean
• time
• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• qc_tbrg_precip_total
• qc_vapor_pressure_mean
• qc_tbrg_precip_total_corr
• Temperature mean(temp_mean)
• wdir_vec_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• base_time
• tbrg_precip_total
• time_offset
• qc_wspd_arith_mean
• qc_time
• qc_atmos_pressure
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - RH probe failure

The T/RH probe failed. The resulting problem led to very unreasonable values of RH (~160%) 
which caused the vapor pressure values to also be incorrect.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)

SGP/MET/E11/E15/E21/E31/E33/E34/E35/E36/E37/E38/E9 - Ice on wind sensors

Wind data was affected by ice buildup on the sensors. Data during this period should be 
used with caution. Exact times of sensor thaw are unknown.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - Rain gauge clogged

The tipping bucket rain gauge was found to be clogged during bi-weekly maintenance. 
Precipitation data during this time may be suspect.

• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• tbrg_precip_total

SGP ALL INSTRUMENTS - Icing Event

An icing event (winter storm Cara) passed slowly through the area during this time frame.  
Instruments at the SGP may have been affected by ice accumulation.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Wind speed vector mean(wspd_vec_mean)
• Temperature mean(temp_mean)
• Wind direction vector mean(wdir_vec_mean)
• Atmospheric pressure(atmos_pressure)
• wdir_vec_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• tbrg_precip_total
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - False tips in high winds

The TBRG's were mounted at a height that made them prone to vibrations caused by high 
winds which may have caused false tips.  The end date of this DQR indicates when the rain 
gauge was lowered to mitigate these effects.  

Effects on the total precipitation amounts are assumed to be negligible.

• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• tbrg_precip_total

SGP/MET/E9 - Wind sensor malfunction

Loose wire contacts and possible bad bearings caused intermittent wind data dropouts 
during this time.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - Bad battery

A faulty battery caused periodic missing data.

• qc_temp_mean
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• Atmospheric pressure(atmos_pressure)
• qc_tbrg_precip_total
• qc_vapor_pressure_mean
• qc_tbrg_precip_total_corr
• Temperature mean(temp_mean)
• temp_std
• qc_logger_volt
• tbrg_precip_total
• qc_time
• time_offset
• East longitude(lon)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Altitude above mean sea level(alt)
• qc_wdir_vec_mean
• qc_wdir_vec_std
• qc_wspd_vec_mean
• qc_rh_mean
• time
• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• North latitude(lat)
• qc_logger_temp
• vapor_pressure_std
• logger_temp
• logger_volt
• rh_std
• wdir_vec_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• base_time
• qc_wspd_arith_mean
• qc_atmos_pressure