Data Quality Reports for Session: 114663 User: tza Completed: 10/07/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000127.3SGP/OKM - Leaf Wetness Index - Sensor doesn't work properlysgp15okmX1.00, sgp15okmX1.a1
D000127.4SGP/OKM/X1 - Soil Temperature at 30 cm beneath sod not bare soilsgp15okmX1.00, sgp15okmX1.a1
D000202.3SGP/OKM/X1 - Station TULL replaced by station PORTsgp05okmX1.00, sgp05okmX1.a1, sgp05okmX1.b1, sgp15okmX1.00, sgp15okmX1.a1, sgp15okmX1.b1,
sgpokmX1.01
D961111.2SGP/TWR/C1 - Reprocess: RH recalibrationsgp1440twr25mC1.a0, sgp1440twr60mC1.a0, sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1,
sgp30twr60mC1.a1
D961111.3
D961210.24
D961210.27
D961210.30
D970323.6Overview of Quality Assurance Runs for September 1996sgp05okmX1.a1, sgp15okmX1.a1
D970909.1documentation change for pressure variablesgp60wpdnsurfX1.b1
D990106.1SGP/MWR/B1/B4/B6/C1 - software changesgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0,
sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0
D990113.1SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0
D990124.2SGP/SONDE - Dry bias in sonde RHDsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0,
DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0,
DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1,
DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1,
DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00,
DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1,
DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00,
sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00,
sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1,
sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0,
sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1,
sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1,
sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0,
sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1,
sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0,
sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1,
sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0,
sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1


DQRID : D000127.3
Start DateStart TimeEnd DateEnd Time
01/01/1994000010/10/19992359
Subject:
SGP/OKM - Leaf Wetness Index - Sensor doesn't work properly
DataStreams:sgp15okmX1.00, sgp15okmX1.a1
Description:
The measurement leaf_ind (leaf wetness index, 
measurement of dew ranging from 0 (dry) to 100(wet)) 
should not be used since Mark Shafer of Oklahoma Mesonet
reports that the sensors never worked properly. 

The new quality assured Oklahoma Mesonet data files
sgp15okmX1.b1 will begin with the January 1, 1999
data and will no longer contain this measurement.
Measurements:sgp15okmX1.00:
  • null(Raw data stream - documentation not supported)
sgp15okmX1.a1:
  • leaf wetness index, measurement of dew ranging from 0 (dry) to 100(wet)(leaf_ind)

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DQRID : D000127.4
Start DateStart TimeEnd DateEnd Time
01/01/1994000010/10/19992359
Subject:
SGP/OKM/X1 - Soil Temperature at 30 cm beneath sod not bare soil
DataStreams:sgp15okmX1.00, sgp15okmX1.a1
Description:
The soil temperature measurement at 30 cm is beneath natural sod rather than beneath bare 
soil. Unfortunately it is misnamed tbare30 (soil temperature at 30 cm beneath bare soil). 

The new data streams sgp15okmX1.b1 (which will be provided beginning January 1, 1999) and 
the data stream sgp15okmX1.a1 (beginning December 1, 1999) both have the name and 
description corrected.
Measurements:sgp15okmX1.00:
  • null(Raw data stream - documentation not supported)
sgp15okmX1.a1:
  • soil temperature at 30 cm beneath bare soil(tbare30)

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DQRID : D000202.3
Start DateStart TimeEnd DateEnd Time
01/01/1994000011/05/19992359
Subject:
SGP/OKM/X1 - Station TULL replaced by station PORT
DataStreams:sgp05okmX1.00, sgp05okmX1.a1, sgp05okmX1.b1, sgp15okmX1.00, sgp15okmX1.a1, sgp15okmX1.b1,
sgpokmX1.01
Description:
PORT (Porter) is a station move from TULL (Tullahassee).  The landowner was building a 
house where the Mesonet site stood, so they had to shut down TULL.  PORT is another orchard, 
located about 9 miles west of the TULL site.   
 

Station Number: 118
Station ID: PORT
Station Name: Porter
Nearest Incorporated City: Clarksville 2.5 W
County: Wagoner
Latitude: 35.8258 degrees N
Longitude 95.5600 degrees W
Elevation: 193 m
Date Commissioned: 1999-11-05 (TULL de-commissioned 1999-11-04)
Measurements:sgp15okmX1.b1:
  • soil temperature at 30 cm beneath natural sod cover(tsoil30)
  • 10 cm soil temp(tsoil10)
  • lat(lat)
  • lon(lon)
  • soil temperature at 10cm beneath bare soil(tbare10)
  • Time offset of tweaks from base_time(time_offset)
  • soil temperature at 5 cm beneath bare soil(tbare5)
  • Dummy altitude for Zeb(alt)
  • base time(base_time)
  • soil temperature at 5 cm beneath natural sod cover(tsoil5)
  • Batter Voltage(vbat)
sgp05okmX1.b1:
  • standard deviation of wind speed(wspd_sigma)
  • air temperature at 1.5m(tdry_1_5m)
  • base time(base_time)
  • lat(lat)
  • precipitation(prec_amt)
  • lon(lon)
  • average wind speed at 2m(wspd_2m)
  • solar radiation(srad)
  • vector average of wind direction measured at 10m(wdir_10m)
  • air temperature at 9m(tdry_9m)
  • average wind run (arithmetic average speed) at 10m(wspd_10m)
  • Retrieved pressure profile(pres)
  • standard deviation of wind direction(wdir_sigma)
  • Relative humidity inside the instrument enclosure(rh)
  • vector average wind magnitude(wvec_10m)
  • Time offset of tweaks from base_time(time_offset)
  • Dummy altitude for Zeb(alt)
  • maximum 3-second wind speed within the 5-minute averaging period(wspd_max)
sgp15okmX1.00:
  • null(Raw data stream - documentation not supported)
sgp05okmX1.00:
  • null(Raw data stream - documentation not supported)
sgp05okmX1.a1:
  • average wind run (arithmetic average speed) at 10m(wspd_10m)
  • air temperature at 1.5m(tdry_1_5m)
  • air temperature at 9m(tdry_9m)
  • standard deviation of wind direction(wdir_sigma)
  • maximum 3-second wind speed within the 5-minute averaging period(wspd_max)
  • standard deviation of wind speed(wspd_sigma)
  • Dummy altitude for Zeb(alt)
  • vector average of wind direction measured at 10m(wdir_10m)
  • lat(lat)
  • solar radiation(srad)
  • Retrieved pressure profile(pres)
  • Time offset of tweaks from base_time(time_offset)
  • Relative humidity inside the instrument enclosure(rh)
  • average wind speed at 2m(wspd_2m)
  • precipitation(prec_amt)
  • base time(base_time)
  • lon(lon)
  • vector average wind magnitude(wvec_10m)
sgp15okmX1.a1:
  • Batter Voltage(vbat)
  • Time offset of tweaks from base_time(time_offset)
  • soil temperature at 30 cm beneath bare soil(tbare30)
  • soil temperature at 5 cm beneath natural sod cover(tsoil5)
  • soil temperature at 10cm beneath bare soil(tbare10)
  • leaf wetness index, measurement of dew ranging from 0 (dry) to 100(wet)(leaf_ind)
  • lon(lon)
  • base time(base_time)
  • soil temperature at 5 cm beneath bare soil(tbare5)
  • Dummy altitude for Zeb(alt)
  • 10 cm soil temp(tsoil10)
  • lat(lat)
sgpokmX1.01:
  • null(Raw data stream - documentation not supported)

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DQRID : D961111.2
Start DateStart TimeEnd DateEnd Time
05/23/1996000010/21/19961830
Subject:
SGP/TWR/C1 - Reprocess: RH recalibration
DataStreams:sgp1440twr25mC1.a0, sgp1440twr60mC1.a0, sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1,
sgp30twr60mC1.a1
Description:
Comparisons of the RH probes with Oklahoma Mesonet probes in the laboratory and 
comparisons of the RH probes with the EBBR over a four day period after the Water Vapor IOP 
indicate the TOWER RH probes were incorrectly  calibrated. Corrections required are summarized 
below.

60 meter level: 
RH data greater than 85% are incorrect for 23 May 1996 through 10 September 2000 GMT.

RH data for 10 September 2330 GMT through 13 September 2130 GMT can be corrected with the 
following equation:
  -1.6 + 0.955*RH 
for original RH of 83% or less. Original RH values of greater than 83% cannot be 
adequately corrected.

RH data for 14 September 0000 GMT through 30 September 2000 GMT can be corrected with the 
equation:
  -1.6 + 0.87*RH
for original RH of 83% or less. Original RH values of greater than 83% cannot be 
adequately corrected. 

RH data for 30 September 2030 GMT through 21 October 1830 GMT can be corrected with the 
equation: 
  0.3 + 1.107*RH
for original RH of 85% or less.  Original RH values of greater than 85% cannot be 
adequately corrected. 


25 meter level:
RH data greater than 90% are incorrect for 23 May 1996 through 10 September 2000 GMT.

RH data for 10 September 0000 GMT through 21 October 1830 GMT can be corrected with the 
equation:
  4.098 + 0.953*RH 
for original RH of 90% or less.  Original RH values of greater than 90% cannot be 
adequately corrected. 

Vapor pressure is also incorrect because RH was incorrect.  Recalculate vapor pressure 
from the recalibrated RH.
Measurements:sgp30twr25mC1.a1:
  • Standard Deviation of Relative Humidity(sd_rh)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
sgp1twr60mC1.a0:
  • Relative humidity inside the instrument enclosure(rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
sgp1440twr60mC1.a0:
  • Maximum Relative Humidity(max_rh)
  • Maximum Vapor Pressure(max_vap_pres)
  • Minimum Vapor Pressure(min_vap_pres)
  • Minimum Relative Humidity(min_rh)
sgp30twr60mC1.a1:
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
sgp1twr25mC1.a0:
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
sgp1440twr25mC1.a0:
  • Maximum Vapor Pressure(max_vap_pres)
  • Minimum Relative Humidity(min_rh)
  • Maximum Relative Humidity(max_rh)
  • Minimum Vapor Pressure(min_vap_pres)

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DQRID : D961111.3
Start DateStart TimeEnd DateEnd Time
Subject:
DataStreams:
Description:
Measurements:

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 DQRID : D961210.24
Start DateStart TimeEnd DateEnd Time
Subject:
DataStreams:
Description:
Measurements:

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 DQRID : D961210.27
Start DateStart TimeEnd DateEnd Time
Subject:
DataStreams:
Description:
Measurements:

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 DQRID : D961210.30
Start DateStart TimeEnd DateEnd Time
Subject:
DataStreams:
Description:
Measurements:

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 DQRID : D970323.6
Start DateStart TimeEnd DateEnd Time
09/01/1996000009/30/19962359
Subject:
Overview of Quality Assurance Runs for September 1996
DataStreams:sgp05okmX1.a1, sgp15okmX1.a1
Description:
Review of automated quality assurance runs for September 1996 by
Mark Shafer:
I noticed
a couple of problems you might want to keep an eye out for.  The
10-cm soil temperature under sod (TS10) at MARS (Marshall) appeared
suspicious the entire month.  A trouble ticket was issued at the end
of the month (Sep. 24), but I would be cautious with that sensor from
at least September 1.  The other concern is Pressure (PRES) at BUFF
(Buffalo).  10 suspect flags were set by the automated QA on Sep. 18,
5 failures on Sep. 25, and 182 failures plus one suspect flag on
Sep. 26.  I searched the files I had previously delivered to you   
(October - January), but did not find a persistent problem.  The
sensor may have been replaced when the failures were noted on the
26th.  Other than these two exceptions, the data appear good.
Measurements:sgp05okmX1.a1: 
  • vector average of wind direction measured at 10m(wdir_10m)
  • lat(lat)
  • solar radiation(srad)
  • average wind run (arithmetic average speed) at 10m(wspd_10m)
  • Retrieved pressure profile(pres)
  • Time offset of tweaks from base_time(time_offset)
  • Relative humidity inside the instrument enclosure(rh)
  • average wind speed at 2m(wspd_2m)
  • air temperature at 1.5m(tdry_1_5m)
  • precipitation(prec_amt)
  • air temperature at 9m(tdry_9m)
  • standard deviation of wind direction(wdir_sigma)
  • maximum 3-second wind speed within the 5-minute averaging period(wspd_max)
  • base time(base_time)
  • lon(lon)
  • standard deviation of wind speed(wspd_sigma)
  • vector average wind magnitude(wvec_10m)
  • Dummy altitude for Zeb(alt)


sgp15okmX1.a1: 
  • soil temperature at 5 cm beneath natural sod cover(tsoil5)
  • soil temperature at 10cm beneath bare soil(tbare10)
  • Batter Voltage(vbat)
  • leaf wetness index, measurement of dew ranging from 0 (dry) to 100(wet)(leaf_ind)
  • lon(lon)
  • base time(base_time)
  • Time offset of tweaks from base_time(time_offset)
  • soil temperature at 5 cm beneath bare soil(tbare5)
  • Dummy altitude for Zeb(alt)
  • soil temperature at 30 cm beneath bare soil(tbare30)
  • 10 cm soil temp(tsoil10)
  • lat(lat)



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 DQRID : D970909.1
Start DateStart TimeEnd DateEnd Time
01/21/1994000003/06/19992359
Subject:
documentation change for pressure variable
DataStreams:sgp60wpdnsurfX1.b1
Description:
The XDC documentation for the pressure variable is incomplete- it reads
"pressure" rather than "pressure reduced to sea-level".  It has always
been sea-level pressure although the provider of the data to the XDC (NCDC)
documents it incorrectly as surface pressure.
Measurements:sgp60wpdnsurfX1.b1: 
  • magnetic declination(magnetic_dcn_stn)
  • base time(base_time)
  • vertical beam elevation angle(vbeam_el_stn)
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)
  • north beam azimuth angle(nbeam_az_stn)
  • Profiler in RASS checkout mode(checkout_mode)
  • Station altitude(alt_stn)
  • Unit Vector Wind Direction(wdir)
  • north beam elevation angle(ebeam_el_stn)
  • Mean Wind Speed(wspd)
  • orientation from true N(orient_n_stn)
  • vertical beam azimuth angle(vbeam_az_stn)
  • Anemometer indicator(anem_ind)
  • site number(site_num_stn)
  • lon(lon)
  • east beam azimuth angle(ebeam_az_stn)
  • north beam elevation angle(nbeam_el_stn)
  • pressure(press)
  • Beam 0 Temperature(temp)
  • Station longitude(lon_stn)
  • surface rainfall count(rain)
  • Count of 6-minute periods to compute average(avg_count)
  • Station latitude(lat_stn)
  • Dummy altitude for Zeb(alt)
  • Time offset of tweaks from base_time(time_offset)
  • lat(lat)



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 DQRID : D990106.1
Start DateStart TimeEnd DateEnd Time
04/03/1995000010/12/19981900
Subject:
SGP/MWR/B1/B4/B6/C1 - software change
DataStreams:sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0,
 sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0
Description:
The MWR operating software was changed on 12 October 1998 to provide additional 
functionality as described below. This change affects the format of the raw and ingested data. 
   
NEW FEATURES
1. Faster sampling rate
   
Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 
20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per 
blackbody sample and gain update.)
   
2. More flexible sampling strategy
   
Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. 
This permits sky samples to be acquired at intervals of 2.67 seconds for improved 
temporal resolution of cloud liquid water variations and better coordination with the millimeter 
cloud radar during IOPs.
   
3. Separation of zenith LOS observations from TIP data
   
When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV 
and LWP computed and reported separately in the output file. This eliminates the periods 
of missing LOS data during calibration checks/updates.
   
4. Automatic self-calibration
   
The software now permits the calibration to be updated at specified intervals or 
continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified 
intervals or whenever clear sky conditions occur, the tip data reduced, the calibration 
updated ,and the radiometer returned to LOS mode without operator intervention. In the 
second case, the radiometer is continuously is TIP mode until changed by the operator.
   
5. Graphical user display
   
The graphical display is comprised of a status display, a message display, a temperature 
plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip 
curves.

Editor's Note: The SGP.C1 data were reprocessed in 2004 and enhancement #3 described above 
was applied to the data prior to Oct 1998.  The SGP.BF data are queued for reprocessing 
as well.
Measurements:sgpmwrtipB1.a0: 
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)


sgpmwrlosB1.a1: 
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  •  (tknd)


sgpmwrlosB4.a0: 
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  •  (tknd)
  • Ambient temperature(tkair)


sgpmwrlosB6.a0: 
  •  (tknd)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)


sgpmwrlosC1.b1: 
  •  (tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)


sgpmwrtipB6.a0: 
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)


sgpmwrlosB1.a0: 
  •  (tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)


sgpmwrtipB4.a0: 
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)


sgpmwrlosC1.a1: 
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  •  (tknd)
  • Ambient temperature(tkair)


sgpmwrlosB4.a1: 
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  •  (tknd)


sgpmwrlosB6.a1: 
  • Ambient temperature(tkair)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  •  (tknd)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)



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 DQRID : D990113.1
Start DateStart TimeEnd DateEnd Time
07/21/1993140601/12/19992359
Subject:
SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
 sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0
Description:
At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made 
operational at the SGP central facility (C1).  No problems were noted over the next few 
days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 
January.  This version includes a beam width correction I developed as well as providing the 
capability to automatically level the elevation mirror (that is, to automatically detect 
and correct offsets in the elevation angle stepper motor position.)

On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not 
executing the system command to move and rename the data files so that the ARM data system 
could retrieve them.  Reducing the length of the storage arrays in the auto-leveling 
feature from 1000 to 250 resolved the problem.  This results in the auto-leveling being based 
on only 4 hours of clear sky data rather than 16 hours at B5 and C1.  This version of the 
program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these 
computers are upgraded to Pentium-class machines.

The improvement in the quality of the tip curves resulting from the auto-leveling has been 
dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 
degrees) have been reduced from +/- 5 K to +/- 0.5 K.  The goodness-of-fit coefficient for 
the tip curves has improved from about 0.995 to over 0.998.  In order to take full 
advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the 
goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998.

Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all 
time.  The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, 
but the data prior to that range did not have these corrections applied.
Measurements:sgpmwrtipB1.a0: 
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)


sgpmwrlosB5.a1: 
  • 31.4 GHz sky brightness temperature(31tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)


sgpmwrtipB5.a0: 
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)


sgpmwrlosB1.a1: 
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)


sgpmwrlosC1.b1: 
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)


sgpmwrtipB6.a0: 
  • 23.8 GHz sky signal(23tipsky)
  • 31.4 GHz sky signal(31tipsky)


sgpmwrtipB4.a0: 
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)


sgpmwrlosC1.a1: 
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)


sgpmwrlosB4.a1: 
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)


sgpmwrlosB6.a1: 
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)



Back To Table of Contents  

 DQRID : D990124.2
Start DateStart TimeEnd DateEnd Time
05/27/1992000005/31/20022359
Subject:
SGP/SONDE - Dry bias in sonde RH
DataStreams:DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0,
 DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0,
 DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1,
 DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1,
 DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00,
 DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1,
 DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00,
 sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00,
 sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1,
 sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0,
 sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1,
 sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1,
 sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0,
 sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1,
 sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0,
 sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1,
 sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0,
 sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1
Description:
Vaisala has confirmed ARM findings of an apparent dry bias in the
relative humidity measured by RS-80H radiosondes.  The cause of
the dry bias is thought to be contamination of the humidity sensor
by volatile organic substances originating from some plastic parts
of the radiosonde.  The amount of contamination is a function of
the time between the date of sonde manufacture and its use.  All
RS-80H sondes manufactured before week 34 of 1998 will show this
bias.  After week 34 of 1998 Vaisala changed its packaging to
reduce, but not eliminate the contamination problem.

Starting with RS-80 radiosonde manufactured in late June 2000 Vaisala
enclosed the sensor boom in an inert plastic shield, thereby eliminating
the contamination that caused the dry bias.

Starting in May 2001 at the SGP, May 2002 at the TWP, and later 2002
at the NSA, ARM has moved to using RS-90 radiosondes.  These sondes
are not subject to the contaminatino that caused the dry bias.

Vaisala is in the process of developing an algorithm that can be 
used to estimate the correct RH from knowledge of the sonde age.
All of the ARM sounding data have sufficient metadata available
to apply the correction.

Additionally, ARM has funded a Science Team effort (Milosevich) to
develop a 'best' correction algorithm for the RS-80 radiosonde humidity
data.  When completed this algorithm will allow us to reprocess the
accumulated RS-80 data and produce a new data platform with what we
hope will be more accurate data.
Measurements:sgpsondeB4.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondeB5.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondewrpnC1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewnpnC1.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


DsgpsondeptuB6.00: 
  •  (Development raw data stream - documentation not supported)


DsgpsondenogcptucalcB1.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewrpnB6.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondeptuC1.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondewnprC1.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondenogcptucalcB5.c1: 
  •  (Development data stream - documentation not supported)


DsgpsondeptucalcC1.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewnpnB4.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondeB6.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewrprB4.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondeptuB1.00: 
  •  (Development raw data stream - documentation not supported)


DsgpsondenogcptucalcC1.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewrpnC1.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrpnB1.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrprC1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewrpnB1.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrprB5.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondeB5.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrprB5.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondeC1.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondewrprB1.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondeB1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondeptuC1.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondenogcptucalcB4.c1: 
  •  (Development data stream - documentation not supported)


DsgpsondeB1.a0: 
  •  (Development data stream - documentation not supported)


DsgpsondeC1.a1: 
  •  (Development data stream - documentation not supported)


DsgpsondeptucalcB5.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewrprB1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewrpnC1.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrpnB1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondeB1.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondeC1.a0: 
  •  (Development data stream - documentation not supported)


DsgpsondeB4.a1: 
  •  (Development data stream - documentation not supported)


DsgpsondeptuB4.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondeB1.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrprB5.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondeC1.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewnpnB1.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrpnB6.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrprC1.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondeC1.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrprC1.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondeptuB5.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondewrpnB5.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrprB4.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondeB1.a1: 
  •  (Development data stream - documentation not supported)


sgpsondeB5.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewnpnB6.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


DsgpsondeB5.a1: 
  •  (Development data stream - documentation not supported)


DsgpsondenogcwrpnB1.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewrprB1.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrpnB5.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondeB4.a0: 
  •  (Development data stream - documentation not supported)


DsgpsondenogcwrpnB4.c1: 
  •  (Development data stream - documentation not supported)


DsgpsondeB5.a0: 
  •  (Development data stream - documentation not supported)


sgpsondewnpnB4.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewnprC1.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrpnB5.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewnpnB5.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


DsgpsondeB4.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondewrpnB6.00: 
  • null(Raw data stream - documentation not supported)


sgpsondewrprB4.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewnpnB1.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondeB4.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondeC1.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewrpnB4.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondenogcwrpnB5.c1: 
  •  (Development data stream - documentation not supported)


sgpsondewnpnC1.a0: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrpnB4.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


DsgpsondeB1.00: 
  •  (Development raw data stream - documentation not supported)


sgpsondeB4.a0: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


sgpsondewnpnB6.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewrpnB4.a1: 
  • Surface dew point temperature(dp)
  • Relative humidity inside the instrument enclosure(rh)


sgpsondewnpnB5.a1: 
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)


DsgpsondeptucalcB4.c1: 
  •  (Development data stream - documentation not supported)


DsgpsondenogcwrpnC1.c1: 
  •  (Development data stream - documentation not supported)


sgpsondeB5.00: 
  • null(Raw data stream - documentation not supported)


DsgpsondeptucalcB1.c1: 
  •  (Development data stream - documentation not supported)



Back To Table of Contents  


END OF DATA