EAMDAR QEvC update

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E-AMDAR QEvC update
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• Jitze van der Meulen, March, 5th, 2006

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E-AMDAR QEvC

• 1 Daily, 2 Monthly and 3 Quarterly reports,
  all available at QEvC public website
• Daily BIAS GROSS ERRORS of TA, FF DD
  andAMOUNT andTIMELINESS of each aircraft
• Monthly OVERVIEW of TRENDS of BIAS of TA, FF
  DD and AMOUNTSbased on the daily's during
  month refreshed every 3-7 days for an actual
  trend
• Quarterly EVALUATION with statistics (amount,
  averages, standard dev.) and gross errors reports
  timeliness for a three months period
  logistics and operational issues special
  studies (analyses)

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QEvC focal issues

• Evaluation requirements of AMDAR systems- to
  be updated?
• Recognizing the improvements- long term trends
  (gt year) ?
• Special RD to investigate weakness/strengths of
  AMDAR for specific applications- for NWP (Local
  Area Models) local use (Aerodrome actual
  upper air profiles)

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QEvC special attention to

• Timeliness- definition ?t(REC OBS)?-
  suitable parameter for evaluation (50
  availability interval, or 60 min. delay
  percentage ?)- time of day dependent ?
• Profiles from ASC/DEC- performance as a
  function of pressure altitude (PA)- observation
  density, frequency, timeliness
• Suitability of LHW data for NWP (PA 10 km
  only)- frequency (availability),- area
  density,- timeliness

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QEvC features

• Automatic QEv of- temperature TA, wind speed
  (FF) -direction (DD)using HITLAM (3H update)
  as reference.- timeliness t(TEC)-t(OBS),special
  check t(OBS) lt t(REC)
• Manual QEv, part of special cases (rather
  complex)- pressure altitude PA,check only
  PAAerodrome lt PAaircraft- position
  LAT/LONcheck only LAT/LON first OBS of ASC
  or last OBS of DES ? LAT/LON Aerodrome
• NoteTA, FF and FF QEv is affected by incorrect
  LAT/LON or PA

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QEvC possible new activities

• Trends in timeliness (and TA, FF, DD), using an
  special XLS application (using 10 days of the
  daily XLS-s)
• Local coverage analyses (per aerodrome)-
  amounts by contour plots of ASC/DES data-
  frequency of availability- timeliness analyses.

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Q
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QEVC Website http//www.knmi.nl/meulenvd/eumetn
et/E-Amdar/QEvC/