Data Quality Reports for Session: 111932 User: quanvlkq Completed: 05/13/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D990505.1Bug in processing of vapor sensing aircraftgecacarsX1.a1, nsaacarsX1.a1, sgpacarsX1.a1, twpacarsX1.a1


DQRID : D990505.1
Start DateStart TimeEnd DateEnd Time
09/22/1998000004/21/19992100
Subject:
Bug in processing of vapor sensing aircraft
DataStreams:gecacarsX1.a1, nsaacarsX1.a1, sgpacarsX1.a1, twpacarsX1.a1
Description:
Message from Bill Moninger, Forecast Systems Laboratory
on April 29, 1999

Today, we implemented changes in the ACARS QC processing that effect the 
dewpoint data in both the java and non-java displays, as well as in the 
downloadable netCDF data.

The new netCDF version number is 2.2.  We processed this data retroactively
for a few hours, so this version starts at 21 UTC on 28 April 1999.

This version fixed a bug in the processing of vapor-sensing aircraft that 
caused the dewpoint to be 0 degree to 5 degree (C) too cold, with the largest errors 
occurring at high mach numbers (which occur at high altitudes). 
Generally errors in dewpoint below 15,000 ft have been less than 3 degree C.
Measurements:sgpacarsX1.a1:
  • Station reporting through(rptStation)
  • errorType(errorType)
  • Wind Speed(windSpeed)
  • time data was received at ground station(timeReceived)
  • missing minutes of input data(missingInputMinutes)
  • peak vertical acceleration(vertAccel)
  • Maximum eddy dissipation rate(maxTurbulence)
  • AWIPS-type data descriptor(dataDescriptor)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • water vapor mixing ratio(waterVaporMR)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • north latitude(latitude)
  • windDirError(windDirError)
  • air temperature (NGM250 predicted)(temperature)
  • tempError(tempError)
  • maximum observation date(maxDate)
  • windSpeedError(windSpeedError)
  • maximum observation time(maxSecs)
  • Corrected data indicator(correctedFlag)
  • Originating Airport(origAirport)
  • Median eddy dissipation rate(medTurbulence)
  • heading of flight path over ground(heading)
  • Aircraft ground speed error(speedError)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • Destination Airport(destAirport)
  • FSL-encrypted tail number(en_tailNumber)
  • minimum observation time(minSecs)
  • Aircraft altitude variance error(bounceError)
  • Wind Direction(windDir)
  • Dew Point (Kelvin)(dewpoint)
  • Aircraft roll angle flag(rollFlag)
  • Altitude(altitude)
  • Time of observation(timeObs)
  • water vapor mixing ratio QC character(waterVaporQC)
  • mach number (0-1)(mach)
  • east longitude(longitude)
  • minimum observation date(minDate)
gecacarsX1.a1:
  • Destination Airport(destAirport)
  • missing minutes of input data(missingInputMinutes)
  • Wind Speed(windSpeed)
  • maximum observation time(maxSecs)
  • windDirError(windDirError)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • water vapor mixing ratio(waterVaporMR)
  • Median eddy dissipation rate(medTurbulence)
  • water vapor mixing ratio QC character(waterVaporQC)
  • errorType(errorType)
  • minimum observation time(minSecs)
  • Station reporting through(rptStation)
  • Maximum eddy dissipation rate(maxTurbulence)
  • windSpeedError(windSpeedError)
  • peak vertical acceleration(vertAccel)
  • time data was received at ground station(timeReceived)
  • maximum observation date(maxDate)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • Corrected data indicator(correctedFlag)
  • Dew Point (Kelvin)(dewpoint)
  • minimum observation date(minDate)
  • AWIPS-type data descriptor(dataDescriptor)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • tempError(tempError)
  • east longitude(longitude)
  • Aircraft altitude variance error(bounceError)
  • Originating Airport(origAirport)
  • north latitude(latitude)
  • mach number (0-1)(mach)
  • Altitude(altitude)
  • Aircraft ground speed error(speedError)
  • heading of flight path over ground(heading)
  • FSL-encrypted tail number(en_tailNumber)
  • air temperature (NGM250 predicted)(temperature)
  • Time of observation(timeObs)
  • Wind Direction(windDir)
  • Aircraft roll angle flag(rollFlag)
nsaacarsX1.a1:
  • Time of observation(timeObs)
  • peak vertical acceleration(vertAccel)
  • Dew Point (Kelvin)(dewpoint)
  • Aircraft ground speed error(speedError)
  • Maximum eddy dissipation rate(maxTurbulence)
  • mach number (0-1)(mach)
  • Destination Airport(destAirport)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • windDirError(windDirError)
  • Wind Direction(windDir)
  • east longitude(longitude)
  • errorType(errorType)
  • windSpeedError(windSpeedError)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • AWIPS-type data descriptor(dataDescriptor)
  • maximum observation time(maxSecs)
  • minimum observation time(minSecs)
  • heading of flight path over ground(heading)
  • air temperature (NGM250 predicted)(temperature)
  • FSL-encrypted tail number(en_tailNumber)
  • time data was received at ground station(timeReceived)
  • Originating Airport(origAirport)
  • tempError(tempError)
  • Aircraft altitude variance error(bounceError)
  • water vapor mixing ratio(waterVaporMR)
  • Median eddy dissipation rate(medTurbulence)
  • Altitude(altitude)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • maximum observation date(maxDate)
  • north latitude(latitude)
  • Wind Speed(windSpeed)
  • water vapor mixing ratio QC character(waterVaporQC)
  • missing minutes of input data(missingInputMinutes)
  • Corrected data indicator(correctedFlag)
  • Station reporting through(rptStation)
  • Aircraft roll angle flag(rollFlag)
  • minimum observation date(minDate)
twpacarsX1.a1:
  • Originating Airport(origAirport)
  • Station reporting through(rptStation)
  • errorType(errorType)
  • air temperature (NGM250 predicted)(temperature)
  • FSL-encrypted tail number(en_tailNumber)
  • peak vertical acceleration(vertAccel)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • minimum observation date(minDate)
  • Aircraft roll angle flag(rollFlag)
  • Aircraft altitude variance error(bounceError)
  • AWIPS-type data descriptor(dataDescriptor)
  • Dew Point (Kelvin)(dewpoint)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • Maximum eddy dissipation rate(maxTurbulence)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • north latitude(latitude)
  • time data was received at ground station(timeReceived)
  • Wind Direction(windDir)
  • minimum observation time(minSecs)
  • mach number (0-1)(mach)
  • maximum observation date(maxDate)
  • Corrected data indicator(correctedFlag)
  • Median eddy dissipation rate(medTurbulence)
  • Altitude(altitude)
  • Time of observation(timeObs)
  • tempError(tempError)
  • windSpeedError(windSpeedError)
  • water vapor mixing ratio(waterVaporMR)
  • maximum observation time(maxSecs)
  • heading of flight path over ground(heading)
  • missing minutes of input data(missingInputMinutes)
  • water vapor mixing ratio QC character(waterVaporQC)
  • Wind Speed(windSpeed)
  • Aircraft ground speed error(speedError)
  • east longitude(longitude)
  • windDirError(windDirError)
  • Destination Airport(destAirport)

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