SGP/TWR/C1 - SE (10X) Carriages Lowered for Maintenance

The SE (10X datastream) carriages were lowered for maintenance.

On 10/06/2003 diagnostic measurements were made on the 25 m and
60 m RH sensors.  On 10/07/03 the carriages were reset at their heights
to try to resolve a communication problem.

• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)
• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)

• Standard Deviation of 25 m Temperature(sd_temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Relative humidity at 25 m(rh_25m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Vapor pressure at 60 m(vap_pres_60m)
• Vapor pressure at 25 m(vap_pres_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)

• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)
• Relative humidity at 60 m(rh_60m)
• Vapor pressure at 25 m(vap_pres_25m)
• Relative humidity at 25 m(rh_25m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)

SGP/SONDE/C1 - Broken temperature sensor

The temperature sensor broke at launch on this sounding.  All of the temperature-related 
data (tdry, rh, dp) are incorrect.

• Surface dew point temperature(dp)
• Dry bulb temperature(tdry)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/TWR/C1 - Met Tower 10X Data Large or Offscale, and Incorrect

During and after the calibration of the MFR, the 10X data was 
               large or offscale and therefore incorrect. It is unclear why 
               this occurred after the tower carriages were put back up at 
               2105 GMT on 8 Dec, or why things returned to normal on 9 Dec.  
               Site Ops was unaware that this was taking place, which would 
               seem to indicate that the met tower alarms on the local data 
               machine were not working.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/SONDE/C1 - Bad RH Data

The RH values during the first half of this sounding oscillate between reasonable values 
and near-zero values.  The oscillation is irregular and seems to be related to failure of 
the RH sensor heating process.

• Surface dew point temperature(dp)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/SONDE/C1 - Bad RH Data

The RH values during the first part of this sounding oscillate between reasonable values 
and near-zero values.  The oscillation seems to be related to failure of the RH sensor 
heating process.

• Surface dew point temperature(dp)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/SONDE/C1 - Surface pressure incorrect

I think the operator inadvdertently transposed to digits when entering the surface 
pressure value.  The value entered is 987.0 hPa but the value shown in the raw data file at 
launch is 978.0.  As a result, the absolute altitudes in this sounding will be slightly 
incorrect as will be the ascent rate during the first 30 seconds of flight.

• Ascent Rate(asc)
• altitude above sea levelaltunits(alt)

SGP/SONDE/C1 - Broken temperature sensor

The temperature sensor broke at launch on this sounding.  All of the temperature-related 
data (tdry, rh, dp) are incorrect.

• Surface dew point temperature(dp)
• Dry bulb temperature(tdry)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/TWR/C1 - Temperature Sensor Not Connected to Datalogger

One of the southeast side 25 m Temperature sensor leads was pulled out from the CR10X 
datalogger terminal strip.

• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)

• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)

SGP/TWR/C1 - Some data incorrect during testing

During testing of tower data wiring, the 60 m southeast side temperature and vapor 
pressure measurements were incorrect.

• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• 60 m Air Temperature(temp_60m)
• Vapor pressure at 60 m(vap_pres_60m)

SGP/TWR/C1 - Tower Southeast Carriages Down for Cleaning of Sensor

The southeast side carriages were lowered to clean a sensor.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/TWR/C1 - Tower Southeast Side Carriages Down for Work on the MFR

The tower southeast side T, RH, and VP measurements were incorrect while the carriages 
were down for work on the MFR.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/TWR/C1 - Southeast Side Data Incorrect During Sensor Tests and Changeout

The met measurements were incorrect while the T/RH probes were being tested
and then replaced.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/TWR/C1 - Tower Southeast Side Carriages Not Connected

The tower southeast side carriages were not connected.  Met data from the southeast side 
is therefore incorrect during the stated period.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/SONDE/C1 - Broken temperature sensor

The temperature sensor broke shortly after launch on this sounding.  All of the 
temperature-related data (tdry, rh, dp) are incorrect.

• Surface dew point temperature(dp)
• Dry bulb temperature(tdry)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/TWR/C1 - Southeast Side RH Too Large

The T/RH probes installed on the 25 m and 60 m levels of the southeast side of the tower 
on 8/15/03 gave RH readings that were too large for RH above 65%. The difference between 
the west and southeast side RH was within the combined accuracies of the sensors up to 
about 80% RH.  Above 80% RH the southeast side RH was much larger, with the difference 
increasing to 10% larger (or more) at 100% RH.  The vapor pressure from the southeast side 
(calculated with RH) was also too large.

The probes were replaced on 2/10/04 and the two sides of the tower now agree
fairly well, with RH not exceeding 100% during saturation.

• Relative humidity at 60 m(rh_60m)
• Vapor pressure at 25 m(vap_pres_25m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 60 m(vap_pres_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)

SGP/SONDE/C1 - Temperature sensor broke high into the sounding

The temperature sensor on this radiosonde appeared to break 56 minutes and 22 seconds into 
the sounding at an altitude of 16570 m.  All the data below this point are good; only 
the data above this point to the end of the sounding (88 minutes and 14 seconds) are bad.

• Surface dew point temperature(dp)
• Dry bulb temperature(tdry)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/TWR/C1 - Southeast Side Tower Measurements Incorrect; Power Cycled

Measurements from the Southeast side 10X met system were incorrect; power was recycled.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/TWR/C1 - Southeast Side (10X datastream) Data Incorrect

The data from the southeast side of the tower (10X datastream) was incorrect
for a short period.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/TWR/C1 - Tower SE Side T/RH/VP Incorrect During Maintenance

The SE side elevator was lowered for maintenance on other instruments.
T/RH/VP data are incorrect during this period.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/SONDE/C1 - Incorrect surface temperature

The operator entered a the surface temperature incorrectly on this sounding.  The sonde 
data file shows the temperature as 33.5 degC but the operations log shows it as 3.5 degC.  
The first temperature recorded by the sonde after launch is 3.7 degC, consistent with the 
typical early morning inversion.

• Surface dew point temperature(dp)
• Dry bulb temperature(tdry)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/TWR/C1 - Southeast 25 and 60 m T/RH/VP Incorrect

The SE carriages were down for annual T/RH checks/replacements.

• Relative humidity at 60 m(rh_60m)
• Relative humidity at 25 m(rh_25m)
• Vapor pressure at 25 m(vap_pres_25m)
• 25 m Air Temperature(temp_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• 60 m Air Temperature(temp_60m)

• Vapor pressure at 25 m(vap_pres_25m)
• Vapor pressure at 60 m(vap_pres_60m)
• Standard Deviation of 25 m Temperature(sd_temp_25m)
• 60 m Air Temperature(temp_60m)
• Standard Deviation of 60 m Vapor Pressure(sd_vap_pres_60m)
• Standard Deviation of 25 m Relative Humidity(sd_rh_25m)
• Relative humidity at 25 m(rh_25m)
• Relative humidity at 60 m(rh_60m)
• Standard Deviation of 60 m Relative Humidity(sd_rh_60m)
• Standard Deviation of 60 m Temperature(sd_temp_60m)
• 25 m Air Temperature(temp_25m)
• Standard Deviation of 25 m Vapor Pressure(sd_vap_pres_25m)

SGP/SONDE/C1 - Scheduled Soundings Missed

The following scheduled sonde launches were missed due to computer 
system failures:

20040116.2330
20040117.0530
20040117.1130
20040117.1730
20040118.0530
20040121.0530

• Surface dew point temperature(dp)
• Westernmost west longitude for Zeb(lon)
• Time offset from base_time(base_time)
• Dry bulb temperature(tdry)
• Time offset of tweaks from base_time(time_offset)
• Eastward Wind Component(u_wind)
• surface wind speed(wspd)
• Northward Wind Component(v_wind)
• Relative humidity scaled, by total column amount from MWR(rh)
• Northernmost north latitude for Zeb(lat)
• Ascent Rate(asc)
• pressure at constant pressure surface(pres)
• Wind Direction(deg)
• altitude above sea levelaltunits(alt)
• Wind Status(wstat)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)