E-AMDAR QEvC update

1. Q E-AMDAR QEvC update Jitze van der Meulen, March, 13th, 2007

2. E-AMDAR QEvC: [1] Measured variables, [2] Position, Time of Observation; Timeliness and [3] Code issues are subjects to evaluation • TA, FF, DDReference: HIRLAM (high precision in time and space)Automized process (daily), checks and evaluation manually • Position (X, Y, Z), Time of ObservationLargely 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. E-AMDAR QEvC update -

3. E-AMDAR QEvC: As ASCII encoded ‘Body.txt’ files: XLS format under test [1] Daily, [2] Monthly and [3] Quarterly reports, all available at QEvC public website: • DailyBIAS & GROSS ERRORS of TA, FF, DD & AMOUNT andTIMELINESS of each aircraft • MonthlyOVERVIEW 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) XLS files with macro, showing graphs Delay in production, new ideas for case studies always welcome E-AMDAR QEvC update

4. QEvC focal issues: QE test and check criteria: to be modified? • Evaluation & requirements of AMDAR systems- to be updated? • Recognizing the improvements- long term trends (> year) ? • Special R&D 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? Quarterly reports to report on periods > 3 months ? User oriented QEv ? Selected users? Humidity, turbulence ? E-AMDAR QEvC update

5. QEvC: special attention to: A suitable, uniform parameter should be defined • 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 To test PA, local 10’ atm. pressures (QFE) should be made available Specific requirements to be investigated for long haul data E-AMDAR QEvC update

6. 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) < t(REC)* • Manual QEv, part of special cases (rather complex):- pressure altitude PA,special check: PA[Aerodrome] < PA[aircraft] *- position LAT/LONspecial check: LAT/LON [first OBS of ASC] or [last OBS of DES]  LAT/LON [Aerodrome] * * Note:TA, FF and FF QEv is affected by incorrect LAT/LON or PA ! E-AMDAR QEvC update

7. 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?) E-AMDAR QEvC update

8. 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.nl/samenw/geoss/wmo/Amdar/ARABIA/index.htm • Daily reports (update ~ every 4 days) • Monthly report (actual: update ~ every 4 days) • Quarterly reports Q E-AMDAR QEvC update

9. E-AMDAR QEvC update

10. Q ? E-AMDAR QEvC update