1. Representativity Study of Surface Stations over Complex Terrain
R. Steinacker, S. Schneider, S. Sperka
Department of Meteorology and Geophysics, University of Vienna
7th COPS Workshop October , Strasbourg

2. OUTLINE: (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

3. (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

4. (Real time) model validation
7th COPS Workshop October , Strasbourg

5. 7th COPS Workshop October 27-29 2008, Strasbourg

7. 7th COPS Workshop October 27-29 2008, Strasbourg

8. (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

9. One central outlier
7th COPS Workshop October , Strasbourg

10. 7th COPS Workshop October 27-29 2008, Strasbourg

11. (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

12. Stuttgart-Echterdingen – Stuttgart-Schnarrenberg (Δ~17km)
IQR(T) = 1.1 K
Stuttgart-Echterdingen – Stuttgart-Schnarrenberg (Δ~17km)
7th COPS Workshop October , Strasbourg

13. 7th COPS Workshop October 27-29 2008, Strasbourg

14. Mesonet-Station 7.5 – Mesonet-Station 7.7 (Δ~2km)
IQR(T) = 0.75 K
Mesonet-Station 7.5 – Mesonet-Station 7.7 (Δ~2km)
7th COPS Workshop October , Strasbourg

15. Mesonet-Station 7.5 (Δ~10min)
IQR(T) = 0.35 K
Mesonet-Station 7.5 (Δ~10min)
7th COPS Workshop October , Strasbourg

16. IQR(T) = 0.86 K IQR(T) = 0.64 K GTS Station 10738 GTS Station 10739
7th COPS Workshop October , Strasbourg

17. Stuttgart-Echterdingen
7th COPS Workshop October , Strasbourg

18. Stuttgart-Schnarrenberg,
7th COPS Workshop October , Strasbourg

19. IQR(T) = 0.02 K IQR(T) = 0.08 K GTS Station 10738 GTS Station 10739
7th COPS Workshop October , Strasbourg

20. Plan: (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

21. 7th COPS Workshop October 27-29 2008, Strasbourg

22. X .. obstacles distance, H .. height of obstacles
Terrain classification from Davenport (1960)
adapted by Wieringa (1980b) in terms of aerodynamic roughness length zo
Class
Short terrain description
zo [m)] 1
Open sea, fetch at least 5 km
0,0002 2
Mud flats, snow; no vegetation, no obstacles
0,005 3
Open flat terrain; grass, few isolated obstacles
0,03 4
Low crops; occasional large obstacles, x/H > 20
0,1 5
High crops; scattered obstacles, 15 < x/H < 20
0,25 6
Parkland, bushes; numerous obstacles, x/H ˜ 10
0,5 7
Regular large obstacle coverage (suburb, forest) 8
City centre with high- and low-rise buildings
>=2
X .. obstacles distance, H .. height of obstacles
© 2006, World Meteorological Organization

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27. Median = 24.2 IQR = 0.53 Median = 23.7 IQR = 0.17
7th COPS Workshop October , Strasbourg

28. Median = 23.8 IQR = 0.79 Median = 25.1 IQR = 0.15
7th COPS Workshop October , Strasbourg

29. Plan: (Real time) model validation Data quality control
Comparison GTS vs. Mesonet data
Representativity of data
Conclusions
7th COPS Workshop October , Strasbourg

30. Prediction of Predictability:
deterministic forecast → ensemble forecast
Probabilistic model validation:
univalent analysis → probabilistic analysis
i. e. analysis + measure of uncertainty (due to observational
uncertainties and scale incompatibility/representativity issues)
Uncertainty is spatially and temporally variable and depends on:
Data quality
Station density
Topography
Spatio-temporal resolution/scale of the analysis
Weather situation
7th COPS Workshop October , Strasbourg

31. Further presentations/poster according to this topic:
F. Zeiz: → wind/ moisture flux divergence
S. Schneider: → precipitation
T. Gorgas: → GTS – NON-GTS data
7th COPS Workshop October , Strasbourg

32. Thank you for your attention !
7th COPS Workshop October , Strasbourg

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