Data Quality Reports for Session: 107705 User: dorais Completed: 09/12/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030515.3NSA/MWR/C1 - no air temperature signalnsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1
D041027.1NSA/MWRP/C1 - Missing datansamwrpC1.b1
D050725.7NSA/MWR/C1 - Reprocess: Revised Calibration Coefficientsnsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1
D050928.3NSA/MWR/C1 - New software version (4.15) installednsamwrlosC1.b1, nsamwrtipC1.a1
D070709.1NSA/MWRP/C1 - Reprocessed: 6-channel retrieval replaced by 5-channel retrievalnsamwrpC1.b1


DQRID : D030515.3
Start DateStart TimeEnd DateEnd Time
05/13/2003190601/15/20050054
Subject:
NSA/MWR/C1  - no air temperature signal
DataStreams:nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1
Description:
When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air 
temperature sensor failed to properly report. It was determined that the wires carrying the 
signal to the analog board did not conform to the standard expected by the upgraded blower. 
The problem was corrected by changing the wiring and modifying the MWR software to read 
the signal from the appropriate corresponding channel.
Measurements:nsamwrC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

nsamwrlosC1.b1:
  • Ambient temperature(tkair)

nsamwrtipC1.a1:
  • Ambient temperature(tkair)


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DQRID : D041027.1
Start DateStart TimeEnd DateEnd Time
02/21/2004092502/23/20042238
10/06/2004000810/27/20041237
11/20/2004003911/22/20041851
04/10/2005000004/11/20051622
09/04/2005053109/06/20051857
09/10/2005005209/12/20051830
09/21/2005180510/12/20052311
06/23/2006180008/08/20062250
08/11/2006235908/14/20061454
10/09/2006210110/11/20061733
01/05/2007235801/08/20072019
02/28/2007230903/05/20070027
Subject:
NSA/MWRP/C1 - Missing data
DataStreams:nsamwrpC1.b1
Description:
Data are missing and unrecoverable.
Measurements:nsamwrpC1.b1:
  • Expected root-mean-square error in liquid water path retrieval(liquidWaterPathRmsError)
  • Derived relative humidity(relativeHumidity)
  • Internal blackbody reference temperature(blackbodyTemperature)
  • Expected root-mean-square error in temperature retrieval(temperatureRmsError)
  • Retrieved liquid water path(liquidWaterPath)
  • Surface pressure at instrument(surfacePressure)
  • atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Data quality flags(dataQualityFlags)
  • Surface water vapor density at instrument(surfaceWaterVaporDensity)
  • Derived virtual temperature(virtualTemperature)
  • Expected root-mean-square error in water vapor density retrieval(waterVaporDensityRmsError)
  • Equilibrium level pressure(equilibriumLevelPres)
  • base time(base_time)
  • Zenith-pointing infrared temperature at 10um(infraredTemperature)
  • Array of heights for the range gates(height)
  • lat(lat)
  • Dummy altitude for Zeb(alt)
  • Total precipitable water vapor, from microwave radiometer(totalPrecipitableWater)
  • Interpolated dewpoint temperature(dewpointTemperature)
  • azimuth(azimuth)
  • Cloud base height(cloudBaseHeight)
  • Expected root-mean-square error in precipitable water retrieval using only
    23.835 and 30.0 GHz(totalPrecipitableWater2RmsError)
  • Expected root-mean-square error in precipitable water retrieval(totalPrecipitableWaterRmsError)
  • elevation(elevation)
  • Lifting condensation level pressure(liftingCondensationLevelPres)
  • Level of free convection pressure(levelFreeConvectionPres)
  • Retrieved water vapor density(waterVaporDensity)
  • lon(lon)
  • Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
  • Microwave brightness temperature(brightnessTemperature)
  • Frequency(frequency)
  • Convective Available Potential Energy(cape)
  • Flag indicating moisture sensor status(wetWindowFlag)
  • Expected root-mean-square error in liquid water content retrieval(liquidWaterContentRmsError)
  • Lifting condensation level(liftingCondensationLevel)
  • Level of free convection(levelFreeConvection)
  • air temperature (NGM250 predicted)(temperature)
  • Surface absolute temperature at instrument(surfaceTemperature)
  • Expected root-mean-square error in liquid water path retrieval using only 23.835
    and 30.0 GHz(liquidWaterPath2RmsError)
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Time offset of tweaks from base_time(time_offset)
  • Surface relative humidity at instrument(surfaceRelativeHumidity)
  • Interpolated water vapor mixing ratio(waterVaporMixingRatio)
  • time(time)
  • Equilibrium level(equilibriumLevel)


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DQRID : D050725.7
Start DateStart TimeEnd DateEnd Time
04/25/2002190006/29/20050000
Subject:
NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients
DataStreams:nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1
Description:
IN THE BEGINNING (June 1992), the retrieval coefficients used to derive 
the precipitable water vapor (PWV) and liquid water path (LWP) from the 
MWR brightness temperatures were based on the Liebe and Layton (1987) 
water vapor and oxygen absorption model and the Grant (1957) liquid 
water absorption model.

Following the SHEBA experience, revised retrievals based on the more 
recent Rosenkranz (1998) water vapor and oxygen absorption models and 
the Liebe (1991) liquid waer absorption model were developed.  The 
Rosenkranz water vapor absorption model resulted a 2 percent increase 
in PWV relative to the earlier Liebe and Layton model.  The Liebe 
liquid water absorption model decreased the LWP by 10% relative to the 
Grant model.  However, the increased oxygen absorption caused a 
0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly 
significant for low LWP conditions (i.e. thin clouds encountered at 
SHEBA).

Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and 
Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 
22 GHz water vapor line from the HITRAN compilation, which is 5 percent 
smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz 
(1998), provided a better fit to the microwave brightness temperature 
measurements at 5 frequencies in the range 22-30 GHz, and yielded more 
accurate retrievals. Accordingly, revised MWR retrieval coefficients 
have been developed using MONORTM, which utilizes the HITRAN compilation 
for its spectroscopic parameters.  These new retrievals provide 3 
percent less PWV and 2.6 percent greater LWP than the previous 
retrievals based on Rosenkranz (1998).

Although the MWR data will be reprocessed to apply the new monortm-based 
retrievals, for most purposes it will be sufficient to correct the data 
using the following factors:

PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ
LWP_MONORTM = 1.026  * LWP_ROSENKRANZ

The Rosenkranz-based retrieval coefficients became active at NSA.C1 
20020425.1900.  The MONORTM-based retrieval coefficients became active 
at NSA.C1 20050629.0000.

Note: a reprocessing effort is already underway to apply the 
Rosenkranz-based retrieval coefficients to all MWR prior to April 
2002.  An additional reprocessing task will be undertaken to apply 
the MONORTM retrieval to all MWR data when the first is completed. 
Read reprocessing comments in the netcdf file header carefully to 
ensure you are aware which retrieval is in play.
Measurements:nsamwrlosC1.a1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

nsa5mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

nsaqmemwrcolC1.c1:
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)

nsamwrlosC1.b1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

nsamwrtipC1.a1:
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)


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DQRID : D050928.3
Start DateStart TimeEnd DateEnd Time
09/16/2002182009/15/20051702
Subject:
NSA/MWR/C1 - New software version (4.15) installed
DataStreams:nsamwrlosC1.b1, nsamwrtipC1.a1
Description:
A problem began with the installation of MWR.EXE version 4.12 in September 2002. The 
software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier 
problem.  The software upgrade corrected the earlier problem but introduced a new one 
that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of 
tip curves, and saturation of CPU usage.  Software versions 4.13 and 4.14 also produced 
these problems.

The new MWR software version (4.15) was installed on 9/15/2005. As a consequence of this 
upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s.
Measurements:nsamwrlosC1.b1:
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 23.8 GHz Blackbody signal(bb23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz sky signal(sky31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Averaged total liquid water along LOS path(liq)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • (tknd)
  • 23.8 GHz sky signal(sky23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • IR Brightness Temperature(ir_temp)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Ambient temperature(tkair)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Temperature correction coefficient at 23.8 GHz(tc23)

nsamwrtipC1.a1:
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • (tknd)
  • 23.8 GHz sky signal(tipsky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbskytip23)
  • Ambient temperature(tkair)
  • 31.4 GHz sky signal(tipsky31)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz blackbody(bb31)
  • 23.8 GHz Blackbody signal(bb23)
  • 31.8 GHz sky brightness temperature derived from tip curve(tbskytip31)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)


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DQRID : D070709.1
Start DateStart TimeEnd DateEnd Time
02/19/2004021406/02/20072359
Subject:
NSA/MWRP/C1 - Reprocessed: 6-channel retrieval replaced by 5-channel retrieval
DataStreams:nsamwrpC1.b1
Description:
Due to repeated failure of the V-band receiver and calibration problems, the 6-channel 
retrieval was retired and a new 5-channel retrieval which uses only the K-band channels was 
implemented.

All data previously processed with the 6-channel retrieval have been reprocessed.
Measurements:nsamwrpC1.b1:
  • Retrieved liquid water path(liquidWaterPath)
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Microwave brightness temperature(brightnessTemperature)


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