DQRID : D990505.1
Start DateStart TimeEnd DateEnd Time
09/22/1998000004/21/19992100
more
Subject:
Bug in processing of vapor sensing aircraft
DataStreams:nsaacarsX1.a1, twpacarsX1.a1, sgpacarsX1.a1, gecacarsX1.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.
Suggestions: 
Measurements:nsaacarsX1.a1:  
  • minimum observation time(minSecs)
  • Time of observation(timeObs)
  • windSpeedError(windSpeedError)
  • altitude(altitude)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • Maximum eddy dissipation rate(maxTurbulence)
  • Aircraft roll angle flag(rollFlag)
  • maximum observation time(maxSecs)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • North latitude(latitude)
  • errorType(errorType)
  • windDirError(windDirError)
  • Destination Airport(destAirport)
  • Corrected data indicator(correctedFlag)
  • missing minutes of input data(missingInputMinutes)
  • time data was received at ground station(timeReceived)
  • maximum observation date(maxDate)
  • Originating Airport(origAirport)
  • heading of flight path over ground(heading)
  • AWIPS-type data descriptor(dataDescriptor)
  • Temperature used for calculation(temperature)
  • minimum observation date(minDate)
  • East longitude(longitude)
  • water vapor mixing ratio(waterVaporMR)
  • Median eddy dissipation rate(medTurbulence)
  • tempError(tempError)
  • FSL-encrypted tail number(en_tailNumber)
  • Aircraft altitude variance error(bounceError)
  • water vapor mixing ratio QC character(waterVaporQC)
  • Wind Speed(windSpeed)
  • Aircraft ground speed error(speedError)
  • Dew Point (Kelvin)(dewpoint)
  • Station reporting through(rptStation)
  • mach number (0-1)(mach)
  • Wind Direction(windDir)
  • peak vertical acceleration(vertAccel)
more

twpacarsX1.a1:  
  • tempError(tempError)
  • Aircraft altitude variance error(bounceError)
  • heading of flight path over ground(heading)
  • Destination Airport(destAirport)
  • peak vertical acceleration(vertAccel)
  • Wind Speed(windSpeed)
  • East longitude(longitude)
  • windDirError(windDirError)
  • Corrected data indicator(correctedFlag)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • windSpeedError(windSpeedError)
  • water vapor mixing ratio(waterVaporMR)
  • Aircraft ground speed error(speedError)
  • Temperature used for calculation(temperature)
  • Time of observation(timeObs)
  • North latitude(latitude)
  • Dew Point (Kelvin)(dewpoint)
  • Maximum eddy dissipation rate(maxTurbulence)
  • mach number (0-1)(mach)
  • maximum observation date(maxDate)
  • minimum observation date(minDate)
  • Station reporting through(rptStation)
  • time data was received at ground station(timeReceived)
  • Median eddy dissipation rate(medTurbulence)
  • Wind Direction(windDir)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • missing minutes of input data(missingInputMinutes)
  • AWIPS-type data descriptor(dataDescriptor)
  • minimum observation time(minSecs)
  • maximum observation time(maxSecs)
  • Originating Airport(origAirport)
  • FSL-encrypted tail number(en_tailNumber)
  • water vapor mixing ratio QC character(waterVaporQC)
  • altitude(altitude)
  • errorType(errorType)
  • Aircraft roll angle flag(rollFlag)
more

sgpacarsX1.a1:  
  • minimum observation time(minSecs)
  • Corrected data indicator(correctedFlag)
  • Temperature used for calculation(temperature)
  • Aircraft ground speed error(speedError)
  • Median eddy dissipation rate(medTurbulence)
  • missing minutes of input data(missingInputMinutes)
  • FSL-encrypted tail number(en_tailNumber)
  • AWIPS-type data descriptor(dataDescriptor)
  • water vapor mixing ratio(waterVaporMR)
  • Time of observation(timeObs)
  • errorType(errorType)
  • Dew Point (Kelvin)(dewpoint)
  • Originating Airport(origAirport)
  • mach number (0-1)(mach)
  • minimum observation date(minDate)
  • Destination Airport(destAirport)
  • tempError(tempError)
  • Wind Direction(windDir)
  • maximum observation date(maxDate)
  • altitude(altitude)
  • heading of flight path over ground(heading)
  • Station reporting through(rptStation)
  • Aircraft roll angle flag(rollFlag)
  • North latitude(latitude)
  • Maximum eddy dissipation rate(maxTurbulence)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • windDirError(windDirError)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • East longitude(longitude)
  • time data was received at ground station(timeReceived)
  • water vapor mixing ratio QC character(waterVaporQC)
  • windSpeedError(windSpeedError)
  • Wind Speed(windSpeed)
  • peak vertical acceleration(vertAccel)
  • maximum observation time(maxSecs)
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • Aircraft altitude variance error(bounceError)
more

gecacarsX1.a1:  
  • RH in probe (0-1), w/ Vaisala correction un-done(rh_probe)
  • AWIPS-type data descriptor(dataDescriptor)
  • Destination Airport(destAirport)
  • Maximum eddy dissipation rate(maxTurbulence)
  • Dew Point (Kelvin)(dewpoint)
  • North latitude(latitude)
  • altitude(altitude)
  • maximum observation date(maxDate)
  • Originating Airport(origAirport)
  • minimum observation date(minDate)
  • errorType(errorType)
  • time data was received at ground station(timeReceived)
  • Aircraft roll angle flag(rollFlag)
  • water vapor mixing ratio QC character(waterVaporQC)
  • UPS ascent/descent time interpolation indicator(interpolatedTime)
  • heading of flight path over ground(heading)
  • Temperature used for calculation(temperature)
  • minimum observation time(minSecs)
  • Time of observation(timeObs)
  • windSpeedError(windSpeedError)
  • East longitude(longitude)
  • mach number (0-1)(mach)
  • maximum observation time(maxSecs)
  • windDirError(windDirError)
  • UPS ascent/descent lat&lon interpolation indicator(interpolatedLL)
  • Wind Speed(windSpeed)
  • peak vertical acceleration(vertAccel)
  • tempError(tempError)
  • Corrected data indicator(correctedFlag)
  • missing minutes of input data(missingInputMinutes)
  • Aircraft ground speed error(speedError)
  • FSL-encrypted tail number(en_tailNumber)
  • Median eddy dissipation rate(medTurbulence)
  • Aircraft altitude variance error(bounceError)
  • Station reporting through(rptStation)
  • water vapor mixing ratio(waterVaporMR)
  • Wind Direction(windDir)
more


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