EAMDAR QEvC update

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E-AMDAR QEvC update
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• Jitze van der Meulen, March, 13th, 2007

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E-AMDAR QEvC

• 1 Measured variables, 2 Position, Time of
  Observation Timeliness and 3 Code issues are
  subjects to evaluation
• TA, FF, DD Reference HIRLAM (high precision in
  time and space)Automized process (daily), checks
  and evaluation manually
• Position (X, Y, Z), Time of Observation Largely
  handwork- X,Y at airport (before ASC, after
  DES)- Z at airport (QNH control)- time (to be
  before time of reception)
• BUFR FM42 code issuesLargely handwork,
  implementation of BUFR not uniform, FM42 OK for
  E-AMDAR, not for all others.

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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
  AMOUNT 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)

As ASCII encoded Body.txt files XLS format
under test
XLS files with macro, showing graphs
Delay in production, new ideas for case studies
always welcome
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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)
• New variables to evaluate?

QE test and check criteria to be modified?
Quarterly reports to report on periods gt 3 months
?
User oriented QEv ? Selected users?
Humidity, turbulence ?
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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

A suitable, uniform parameter should be defined
To test PA, local 10 atm. pressures (QFE)
should be made available
Specific requirements to be investigated for long
haul data
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QEvC features

• Automatic Daily QEv of- temperature TA, wind
  speed (FF) -direction (DD)using HIRLAM (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,special check
  PAAerodrome lt PAaircraft - position
  LAT/LONspecial check 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 new activities

• Trends in timeliness (and TA, FF, DD), using an
  special XLS application (using 10 days of the
  daily XLS-s) performed by the operator using the
  daily results (under development)
• Local coverage analyses (per aerodrome) (case
  studies only?)- amounts by contour plots of
  ASC/DES data- frequency of availability-
  timeliness analyses.
• Control of code formats (ASCII, BUFR) (daily,
  weekly, monthly?)

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Comments and suggestions are very welcome !
All reports software are available at QEVC
Website http//www.knmi.nl/samenw/geoss/eumetnet
/E-Amdar/QEvC/
Also ASDAR http//www.knmi.nl/samenw/geoss/wmo
/Amdar/ASDAR Middle East AMDAR http//www.knmi.n
l/samenw/geoss/wmo/Amdar/ARABIA/index.htm

• Daily reports (update every 4 days)
• Monthly report (actual update every 4 days)
• Quarterly reports

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