2007-11-08 1 e-amdar qevc update jitze van der meulen, november, 8 th, 2007
TRANSCRIPT
2007-11-08 1
E-AMDAR QEvC update
Jitze van der Meulen, November, 8th, 2007
2007-11-08 E-AMDAR QEvC update 2
[1] Measured variables, [2] Position, Time of Observation; Timeliness and [3] Code issues are subjects to evaluation
1. TA, FF, DD Reference: HIRLAM (high precision in time and space)Automized process (daily), checks and evaluation manually
2. 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)
3. BUFR & FM42 code issuesLargely handwork, implementation of BUFR not uniform, FM42 OK for E-AMDAR, not for all others.
E-AMDAR QEvC:
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Altitude vs. pressure altitude
T-dew vs. mixing ratio
2007-11-08 E-AMDAR QEvC update 3
[1] Daily, [2] Monthly and [3] Quarterly reports, all available at QEvC public website:
1. Daily BIAS & GROSS ERRORS of TA, FF, DD & AMOUNT andTIMELINESS of each aircraft
2. 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]
3. 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)
E-AMDAR QEvC:
As ASCII encoded ‘Body.txt’ files: XLS format
XLS files with macro, showing graphs
Production restarted, new ideas for case studies
always welcome
2007-11-08 E-AMDAR QEvC update 4
QEvC focal issues:
1. Evaluation & requirements of AMDAR systems- to be updated?
2. Recognizing the improvements- long term trends (> year) ?
3. Special R&D to investigate weakness/strengths of AMDAR for specific applications- for NWP (Local Area Models) & local use (Aerodrome – actual upper air profiles)
4. New variables to evaluate?
QE test and check criteria: to be modified? Modified
criteria WMO
Quarterly reports to report on periods > 3
months ? Year, 5 years
User oriented QEv ?
Selected users?
Humidity, turbulence, icing ?
Different criteria are stated by:
- E-AMDAR (QEvC)
- WMO AMDAR Manual
- WMO GDP[R]S
- EUCOS
- NOAA (MADIS, NCEP)
.
2007-11-08 E-AMDAR QEvC update 5
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 (case study) ?
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
We have the folowing numbers:
N1 = TOTAL_0_45 (OBS received with a delay beteen 0 and 45 min)
N2 = TOTAL_46_60 (OBS received with a delay beteen 46 and 60 min)
N3 = TOTAL_61_120 (OBS received with a delay beteen 61 and 120 min)
N4 = TOTAL_GT_120 (OBS received with a delay > 120 min)
so the total amount is N = N1+N2+N3+N4
To define a parameter Q, with
Q1 = N1/N (i.e. based on a delay between 0 and 45 min)
Q2 = (N1+N2)/N (i.e. based on a delay between 0 and 60 min)
Q3 = (N1+N2+N3)/N (i.e. based on a delay between 0 and 120 min)
Q4 = (N1+N2+N3+N4)/N = 100% [only for checking any software]
Q should be expressed in %
Based on further experience we have to look to either Q1, Q2 or Q3. Since Q3 is in many cases 100%, Q1 or Q2 will be a better choice.
Another parameter could be given by P= 1, 2, 3 or 4 based on the 50% values. E.g. if Q1 > 50% then P=1, or if Q1 < 50% and Q2 > 50% then P=2, etc. (will work fine too)
q- chart 01 aug 2003first 20 aircraft
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AR007EPZ
EU0002
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EU0022
EU0032
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EU0059
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EU0061
EU0080
EU0081
aircraft
Q
TOTAL_GT_120
TOTAL_61_120
TOTAL_46_60
TOTAL_0_45
P chart 01 aug 2003first 20 aircraft
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AR007EPZ
EU0002
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EU0081
aircraft
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2007-11-08 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 !
Wind vector analyses
2007-11-08 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
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?)
2007-11-08 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/
• Daily reports (update ~ every 4 days)
• Monthly report (actual: update ~ every 4 days)
• Quarterly reports
Also:Middle East AMDAR:
http://www.knmi.nl/samenw/geoss/wmo/Amdar/ARABIA/index.htm
2007-11-08 E-AMDAR QEvC update 9
Case study: Wind analyses by Cartesian co-ordinates
Current situation:
FF = FF(OBS)–FF(MOD)
DD = |DD(OBS)–DD(MOD)|
Vector representation:
u = u[OBS] – u[MOD]
v = v[OBS] – v[MOD]
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2007-11-08 E-AMDAR QEvC update 10
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