NSA/MET/C1 - Temp/RH/wind data questionable

New wind sensors and new T/RH probes were being installed during this time period.  The 
tower booms were lowered and much of the data collected were not at listed heights nor were 
the data accurate due to configurations during install.

• wdir_vec_std
• rh_std
• qc_rh_mean
• Wind direction vector mean(wdir_vec_mean)
• qc_temp_mean
• qc_wspd_arith_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• qc_wdir_vec_mean
• qc_dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• qc_vapor_pressure_mean

NSA/MET/C1 - Wind data intermittent

There was a loose wire on the serial data multiplexer causing the wind data to become 
missing during high wind situations.  The high winds caused the enclosure to vibrate making 
the connection intermittent.

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

NSA/MET/C1 - Met data incorrect during calibration

All met data from the tower booms (temp, RH, winds and derived variables) were incorrect 
due to the booms being lowered from their measurement heights.  Additionally, the 
scaffolding was located directly adjacent to the booms affecting the wind field and the Temp/RH 
data.

• wdir_vec_std
• rh_std
• qc_rh_mean
• Wind direction vector mean(wdir_vec_mean)
• qc_temp_mean
• qc_wspd_arith_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• qc_wdir_vec_mean
• qc_dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• qc_vapor_pressure_mean

NSA/MET/C1 - 2m RH values incorrect

The new t/rh probe installed during annual calibrations and checks began to exhibit 
readings that were biased high compared to the Chilled Mirror Hygrometer.  In high RH 
conditions the sensor would consistently report RH values in excess of 105%.  Comparisons to the 
other tower levels also suggested that the 2m level RH data is suspect.

• dew_point_mean
• rh_std
• qc_dew_point_mean
• qc_rh_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• vapor_pressure_std
• qc_vapor_pressure_mean

NSA/TWR/C1 - 40m T/RH Sensor Failure

40m RH data were very noisy after tower maintenance.  Following system re-boot, RH data 
were too high. Sensor was replaced.

• dew_point_mean
• rh_std
• qc_dew_point_mean
• qc_rh_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• vapor_pressure_std
• qc_vapor_pressure_mean

NSA/TWR/C1 - 40m and 20m Data Incorrect

A power distribution problem required us to shut down power to the 40m level.  All T/RH 
were missing and the 40m wind sensor did not have heat to remove any ice build up.  All 
wind data from the 40m level should be viewed critically before use.  The 20m T/RH sensor 
was power spike when the problem occurred causing this sensor to become erratic.  
See D100302.2 for the continuation of the 40m problem.

• wdir_vec_std
• rh_std
• qc_rh_mean
• Wind direction vector mean(wdir_vec_mean)
• qc_temp_mean
• qc_wspd_arith_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• qc_wdir_vec_mean
• qc_dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• qc_vapor_pressure_mean

NSA/TWR/C1 - 40m level data incorrect

A power distribution problem required us to turn off the 50V DC power to the 40m level.  
This shutdown the T/RH probe and the heating of the ultrasonic sensor.  The wind data is 
useful at times when there is no icing present.  This DQR is a follow on to D091201.2 that 
was closed when the 20m level T/RH probe was replaced.

• wdir_vec_std
• rh_std
• Wind direction vector mean(wdir_vec_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• dew_point_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)

NSA/TWR/C1 - Wind sensor data failures

The wind speed and direction values for 2m, 10m and 20m dropped to zero at 14:20 GMT. The 
cause was a power failure due to failed power line.  Power spikes caused the wind sensors 
to revert to default settings for communications and measurements. The following is a 
list of dates that the various sensors came back online:
  2m wind problem ending on 01/28/2010 @ 2330GMT
 20m wind problem ending on 02/04/2010 @ 2230GMT
 10m wind problem ending on 02/05/2010 @ 2100GMT
  
40m winds were already failing and documented in DQPR 2262 and PIF P091030.1.  

The MET system was also affected and documented in DQPR 2337.

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

NSA/MET/C1 - Wind sensor data missing

2m, 10m, 20m wind sensors went off-line 5/17 due to GFCI tripping caused by failing CMH.   
The 2m and 20m data wind sensor returned 6/6, but the 10m remained offline until 7/20 as 
the sensor was damaged.

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

NSA/MET/C1 - 20m T/RH sensor failure

The 20m temperature and RH were erratic and incorrect resulting in incorrect vapor 
pressure calculations.  The sensor was damaged by voltage spikes on the power lines.

• dew_point_mean
• rh_std
• Temperature mean(temp_mean)
• temp_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• vapor_pressure_std
• trh_err_code

NSA/TWR/C1 - 40m T/RH sensor noise

40m T/RH sensor spiked on 5/17/12, then remained noisy mostly at high humidity. Sensor 
replacement during tower maintenance on 8/1/12 has resolved the issue.

• dew_point_mean
• rh_std
• Temperature mean(temp_mean)
• temp_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• vapor_pressure_std
• trh_err_code

NSA/MET/C1 - 10m wind data not reporting

10 meter wind speed and direction data were not reporting after a scheduled power outage 
took place.   Sensor was replaced.

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

NSA/MET/C1 - 20m T/RH sensor failure

The 20 meter temperature, dew point, and humidity data were spiking and reporting high/low 
in relation to other sensors on the tower.  Sensor was replaced.

• dew_point_mean
• rh_std
• Temperature mean(temp_mean)
• temp_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• vapor_pressure_std

NSA/MET/C1 - Tower maintenance

Data not representative due to tower instrument maintenance.

• wdir_vec_std
• rh_std
• qc_rh_mean
• Wind direction vector mean(wdir_vec_mean)
• qc_temp_mean
• qc_wspd_arith_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• qc_wdir_vec_mean
• qc_dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• qc_vapor_pressure_mean

NSA/MET/C1 - Incorrect 20m wind data

The 20 meter wind data flatline due to a loss of communication settings.

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

NSA/MET/C1 - Incorrect 2m wind data

The 2 meter wind data flatlines due to a loss of communication settings.

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

NSA/MET/C1 - Power outage

Incorrect data due to power outage.

• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Wind speed vector mean(wspd_vec_mean)
• vapor_pressure_std

NSA/TWR/C1 - 40m temp/humidity problem

A problem with the temp/humidity sensor at the 40m level caused incorrect data to be 
recorded. Between 5/10/14 and 5/16/14, dew point, relative humidity, and vapor pressure data 
are occasionally incorrect (vastly different when compared with other levels). Beginning 
6/5/14, the data go missing entirely until a sensor exchange occurred on 7/15/2014.

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

NSA/TWR/C1 - 40m wind sensor outage

Wind direction and speed at the 40 meter level are missing during this time due to 
incorrect sensor configuration.

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

NSA/TWR/C1 - Reprocessing Notice (RID 1240)

See below for details of reprocessing that was completed on 20150626.  Original 
DQR category: 4 (Red, Incorrect).

-----------------------------------------------------------

The 10m temperature and relative humidity fields are swapped during this time (and 
corresponding standard deviation fields). The 40m temperature and relative humidity fields are 
swapped during this time (and corresponding standard deviation fields). The raw data will 
be corrected and reprocessed to fix this issue. The 10m and 40m error codes are incorrect 
and will not be fixed.

• rh_std
• Temperature mean(temp_mean)
• temp_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• trh_err_code

NSA/TWR/C1 - 2m Temp/RH instrument offline

A broken wire caused missing data from the 2m temp/relative humidity sensor during this 
time.

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

NSA/MET/C1 - Reprocessing Notice (RID 1252)

See below for details of reprocessing that was completed on 20150109.  Original 
DQR category: 4 (Red, Incorrect).

-----------------------------------------------------------

The wind direction data are 30 degrees too high due to an alignment/offset problem during 
this time. Problem affects all 4 tower levels in the nsatwrC1.b1 datastream, as well as 
the wind direction data in the nsametC1.b1 datastream. Data will be reprocessed for 
correction.

• wdir_vec_std
• Wind direction vector mean(wdir_vec_mean)

NSA/TWR/C1 - 40m wind data missing

There was a communication problem with the 40m wind sensor. Data are missing during the 
indicated time period.

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

NSA/TWR/C1 - Tower maintenance

Tower was lowered for annual T/RH sensor exchanges. Data may not be representative of 
conditions at stardard heights.

• wdir_vec_std
• rh_std
• Wind direction vector mean(wdir_vec_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• Temperature mean(temp_mean)
• temp_std
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Wind speed vector mean(wspd_vec_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std

NSA/TWR/C1 - 10m T/RH possible bias

A calibration check showed questionable agreement of relative humidity with the test 
probe. The sensor was replaced with a newly calibrated unit. 10m relative humidity values are 
suspect during this time.

• dew_point_mean
• rh_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std

NSA/TWR/C1 - Wind data missing at 40 meter level

40 meter wind sensor lost configuration settings resulting in missing data.

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

NSA/TWR/C1 - Missing wind data at 40-meter level

The wind sensor at the 40-meter level lost communication resulting in missing data.

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

NSA/TWR/C1 - 40m wind speed too high

The 40 meter wind speed data is higher than expected during this time.

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

NSA/TWR/C1 - Instrument contamination

Probable sensor contamination caused dew point and relative humidity readings to be much 
lower than expected at the 40 meter level.

• dew_point_mean
• rh_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std