SGP/THWAPS/B6 - Loss of temperature and RH for 8 hours

The UPS for this system failed resulting in loss of power to the HMP233 unit.  As a 
result, the temperature and RH values were read as zero by the data logger.  SiteOps replaced 
the UPS and all appears well now.

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Relative Humidity(sd_rh)
• Beam 0 Temperature(temp)

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Beam 0 Temperature(temp)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Relative Humidity(sd_rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B1/B5/B6/C1 - Missing data due to Ice storm and clock problems

Data are missing due to power failures caused by an ice storm
and resulting system/instrument clock problems.

• Standard Deviation of Relative Humidity(sd_rh)
• Unit Vector Wind Direction(wdir)
• lat(lat)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Time offset of tweaks from base_time(time_offset)
• Mean Wind Speed(wspd)
• Vapor Pressure (kiloPascals)(vap_pres)
• Beam 0 Temperature(temp)
• Standard Deviation of Air Temperature(sd_temp)
• base time(base_time)
• Standard Deviation of Wind Direction(sd_wdir)
• lon(lon)
• Standard Deviation of Pressure(sd_pres)
• Retrieved pressure profile(pres)
• Batter Voltage(vbat)
• Dummy altitude for Zeb(alt)

• Retrieved pressure profile(pres)
• lat(lat)
• Standard Deviation of Relative Humidity(sd_rh)
• Standard Deviation of Air Temperature(sd_temp)
• Batter Voltage(vbat)
• Unit Vector Wind Direction(wdir)
• Beam 0 Temperature(temp)
• Vapor Pressure (kiloPascals)(vap_pres)
• Time offset of tweaks from base_time(time_offset)
• Standard Deviation of Pressure(sd_pres)
• Relative humidity inside the instrument enclosure(rh)
• Mean Wind Speed(wspd)
• Standard Deviation of Wind Direction(sd_wdir)
• lon(lon)
• base time(base_time)
• Dummy altitude for Zeb(alt)
• Standard Deviation of Vapor Pressure(sd_vap_pres)

• null(Raw data stream - documentation not supported)

• null(Raw data stream - documentation not supported)

• lon(lon)
• Batter Voltage(vbat)
• Standard Deviation of Relative Humidity(sd_rh)
• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Time offset of tweaks from base_time(time_offset)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• lat(lat)
• Retrieved pressure profile(pres)
• Unit Vector Wind Direction(wdir)
• base time(base_time)
• Dummy altitude for Zeb(alt)
• Beam 0 Temperature(temp)
• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Air Temperature(sd_temp)

• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Air Temperature(sd_temp)
• Batter Voltage(vbat)
• lon(lon)
• Mean Wind Speed(wspd)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Vapor Pressure (kiloPascals)(vap_pres)
• Retrieved pressure profile(pres)
• lat(lat)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Wind Direction(sd_wdir)
• Standard Deviation of Pressure(sd_pres)
• Unit Vector Wind Direction(wdir)
• Standard Deviation of Relative Humidity(sd_rh)
• Beam 0 Temperature(temp)
• Dummy altitude for Zeb(alt)

• null(Raw data stream - documentation not supported)

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Wind Direction(sd_wdir)
• Batter Voltage(vbat)
• lon(lon)
• Time offset of tweaks from base_time(time_offset)
• lat(lat)
• Beam 0 Temperature(temp)
• Mean Wind Speed(wspd)
• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Relative Humidity(sd_rh)
• base time(base_time)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Retrieved pressure profile(pres)
• Dummy altitude for Zeb(alt)
• Unit Vector Wind Direction(wdir)

• lon(lon)
• Retrieved pressure profile(pres)
• Batter Voltage(vbat)
• Beam 0 Temperature(temp)
• Time offset of tweaks from base_time(time_offset)
• lat(lat)
• Dummy altitude for Zeb(alt)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Wind Direction(sd_wdir)
• Unit Vector Wind Direction(wdir)
• base time(base_time)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Relative Humidity(sd_rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Pressure(sd_pres)
• Mean Wind Speed(wspd)

• null(Raw data stream - documentation not supported)

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Batter Voltage(vbat)
• lat(lat)
• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Time offset of tweaks from base_time(time_offset)
• Standard Deviation of Wind Direction(sd_wdir)
• Relative humidity inside the instrument enclosure(rh)
• Beam 0 Temperature(temp)
• Vapor Pressure (kiloPascals)(vap_pres)
• Unit Vector Wind Direction(wdir)
• Retrieved pressure profile(pres)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Mean Wind Speed(wspd)
• Standard Deviation of Relative Humidity(sd_rh)
• lon(lon)

• Unit Vector Wind Direction(wdir)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• base time(base_time)
• Standard Deviation of Relative Humidity(sd_rh)
• Batter Voltage(vbat)
• Relative humidity inside the instrument enclosure(rh)
• lat(lat)
• Dummy altitude for Zeb(alt)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Pressure(sd_pres)
• lon(lon)
• Time offset of tweaks from base_time(time_offset)
• Standard Deviation of Wind Direction(sd_wdir)
• Vapor Pressure (kiloPascals)(vap_pres)
• Mean Wind Speed(wspd)
• Retrieved pressure profile(pres)
• Beam 0 Temperature(temp)

SGP/THWAPS/B5 - T/RH Sensor Failure

The T/H sensor cable was chewed in half by a rodent.  Cable was
replaced and reasonable data resumed after the transmitter was
adjusted 12/23.

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Relative Humidity(sd_rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Beam 0 Temperature(temp)
• Standard Deviation of Air Temperature(sd_temp)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B6 - Battery Voltage Problem

Power supply failed and was replaced.  Data were intermittently 
incorrect and very spiky.

• base time(base_time)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Beam 0 Temperature(temp)
• Mean Wind Speed(wspd)
• Batter Voltage(vbat)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Wind Direction(sd_wdir)
• Retrieved pressure profile(pres)
• Unit Vector Wind Direction(wdir)
• Standard Deviation of Relative Humidity(sd_rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B5 - Temperature Sensor failure

Temperature readings exceed 50 deg C.  Temperature sensor failed and was replaced.

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Beam 0 Temperature(temp)
• Standard Deviation of Air Temperature(sd_temp)

SGP/THWAPS/B4 - Wind Data Suspect

Wind speed and direction data suspect during time period due to icing.

• Mean Wind Speed(wspd)
• Standard Deviation of Wind Direction(sd_wdir)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B5 - Wind Data Suspect

Wind speed and direction data intermittently low throughout time period due to icing on 
sensor.

• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B6 - Wind Data Suspect

Wind speed and direction data intermittently low throughout time period due to icing on 
sensor.

• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure

The THWAPS humidity sensor output was scaled so that the instrument output voltage range 
(0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at 
the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities 
because of this 100 %RH maximum. 

The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This 
resulted in a slight loss of precision in the measurements, but since the RH measurement is 
only accurate to 2-3 %RH at best, this isn't a significant problem.

The saturation vapor correction when temps are below 0C contained an error in the 
multiplier.  The incorrect multiplier only equates to an error of 0.01 kPa which is less than the 
stated uncertainty of the measurement (+/- 0.035 kPa).

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressure

The THWAPS humidity sensor output was scaled so that the instrument output
voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the
co-located chilled mirror sensor at the CF suggested that the THWAPS RH
sensor was reading artifically low at high humidities because of this 100
%RH maximum. 
   
The scaling of the system was changed so that 0-1 VDC now represents 0-110
%RH. This resulted in a slight loss of precision in the measurements, but
since the RH measurement is only accurate to 2-3 %RH at best, this isn't a
significant problem.
   
The saturation vapor correction when temps are below 0C contained an error
in the multiplier.  The incorrect multiplier only equates to an error of
0.01 kPa which is less than the stated uncertainty of the measurement (+/-
0.035 kPa).

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B6  - Minor biases in humidity and saturation vapor pressure

The THWAPS humidity sensor output was scaled so that the instrument output
voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the
co-located chilled mirror sensor at the CF suggested that the THWAPS RH
sensor was reading artifically low at high humidities because of this 100
%RH maximum. 
   
The scaling of the system was changed so that 0-1 VDC now represents 0-110
%RH. This resulted in a slight loss of precision in the measurements, but
since the RH measurement is only accurate to 2-3 %RH at best, this isn't a
significant problem.
   
The saturation vapor correction when temps are below 0C contained an error
in the multiplier.  The incorrect multiplier only equates to an error of
0.01 kPa which is less than the stated uncertainty of the measurement (+/-
0.035 kPa).

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B4 - RH values exceeding 105%

RH measurements were reaching the max value of 105% on a consistent basis.  Spider web 
internal to the sensor housing was found and removed.

• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Relative Humidity(sd_rh)

SGP/THWAPS/B4 - Time uncertainty

The clock on the site collection system was incorrect when it was deployed on 10/20.  The 
clock was corrected on 10/21 at approximately 15:02.  The data collected in the interim 
received grossly wrong time stamps.  These time stamps have been manually corrected, but 
there is some uncertainty in the time stamps still.

Data during the period specified should be considered to be within +/- 5 minutes of the 
timestamp indicated.

• Mean Wind Speed(wspd)
• Beam 0 Temperature(temp)
• Relative humidity inside the instrument enclosure(rh)
• Retrieved pressure profile(pres)
• base time(base_time)
• Vapor Pressure (kiloPascals)(vap_pres)
• Unit Vector Wind Direction(wdir)
• Time offset of tweaks from base_time(time_offset)

SGP/THWAPS/B6 - Wind Speed values near zero

The wind sensor reported speeds near zero during period due to propeller falling off.  
Propeller was replaced.

• Mean Wind Speed(wspd)

SGP/THWAPS/B4 - Temp and RH data incorrect

After sensor replacement the temperature values are too low.  The range of the sensor was 
incorrectly set at -40 to 80 instead of -30 to 70.  RH values are also suspect.

• Standard Deviation of Air Temperature(sd_temp)
• Beam 0 Temperature(temp)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Relative Humidity(sd_rh)

SGP/THWAPS/B4 - Reprocess: RH% values 9% High

After replacement of the THWAPS T/RH sensor the span was incorrectly set to 0-100 instead 
of 0-110.  This caused the RH values to be 9% higher than actual values.

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

SGP/THWAPS/B6 - Wind Speed Data Artificially Low

The wind speed data is lower than surrounding sites during this time period.  Icing 
conditions were occurring leading to the lower wind speeds as the sensor was artificially 
slowed.

• Mean Wind Speed(wspd)

SGP/THWAPS/B5 - Wind Speed and Direction Data Incorrect

Wind speed and direction data were incorrect as the sensor was frozen.

• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B5 - Reprocess: RH values 10% Above Actual

The T/RH probe was replaced with a recently calibrated sensor.  The newly installed probe 
did not have the correct span 0-110% RH for output.  This caused the readings to 
artificially high by 10%.

• Standard Deviation of Relative Humidity(sd_rh)
• Relative humidity inside the instrument enclosure(rh)

SGP/THWAPS/B5 - Wind Data Incorrect Due to Icing

An ice storm caused the wind data from the RM Young wind sensor to be
incorrect.  In many instances it was frozen and unmoving, at times it
measured values but those are extremely suspect.

• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B6 - Wind Data Incorrect Due to Icing

An ice storm caused the wind data from the RM Young wind sensor to be
incorrect.  In many instances it was frozen and unmoving, at times it
measured values but those are extremely suspect.

• Standard Deviation of Wind Direction(sd_wdir)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS/B4 - Wind Data Incorrect Due to Icing

An ice storm caused the wind data from the RM Young wind sensor to be
incorrect.  In many instances it was frozen and unmoving, at times it
measured values but those are extremely suspect.

• Mean Wind Speed(wspd)
• Standard Deviation of Wind Direction(sd_wdir)
• Unit Vector Wind Direction(wdir)

SGP/THWAPS - Broken anemometer at B5 THWAPS

The R. M. Young anemometer lost a propellor vane and stopped.  This
problem was noted by Site Ops and repaired.  The wind velocity data during
the time the anemometer was broken were recorded as 0.007 m/s.

• null(Raw data stream - documentation not supported)

• Time offset of tweaks from base_time(time_offset)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Retrieved pressure profile(pres)
• Standard Deviation of Relative Humidity(sd_rh)
• Beam 0 Temperature(temp)
• lat(lat)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Wind Direction(sd_wdir)
• Standard Deviation of Pressure(sd_pres)
• Batter Voltage(vbat)
• lon(lon)
• Mean Wind Speed(wspd)
• base time(base_time)
• Dummy altitude for Zeb(alt)
• Unit Vector Wind Direction(wdir)

• (Development data stream - documentation not supported)

• (Development raw data stream - documentation not supported)

• (Development data stream - documentation not supported)

• base time(base_time)
• Unit Vector Wind Direction(wdir)
• Standard Deviation of Pressure(sd_pres)
• lon(lon)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Time offset of tweaks from base_time(time_offset)
• lat(lat)
• Standard Deviation of Wind Direction(sd_wdir)
• Standard Deviation of Relative Humidity(sd_rh)
• Dummy altitude for Zeb(alt)
• Batter Voltage(vbat)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Relative humidity inside the instrument enclosure(rh)
• Mean Wind Speed(wspd)
• Retrieved pressure profile(pres)
• Beam 0 Temperature(temp)