1. 7th COPS Workshop October 27-29 2008, Strasbourg The Investigation of Moisture Flux Divergence from COPS Mesonet data Felizitas Zeitz, Stefan Schneider, Reinhold Steinacker Department of Meteorology and Geophysics, University of Vienna

2. 7th COPS Workshop October 27-29 2008, Strasbourg Preparing the wind information -classify all HOBO weather stations manually -Extrapolate the 3m wind to 10 m wind with the logarithmic wind profil -Average over 24hr and 12 hr (6-18h, 18-6h) -Gain modified data sets Moisture Flux Convergence

3. 7th COPS Workshop October 27-29 2008, Strasbourg Wind

4. 7th COPS Workshop October 27-29 2008, Strasbourg Wind

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

6. 7th COPS Workshop October 27-29 2008, Strasbourg VERA Analysis for IOP 8b 15. July 2007 6:00-6:00 UTC Moisture Flux Convergence + 3 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-109.5, max= 121.8,  =5,8,  2 =1164.2 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.0, max=0.9,  =0.3,  2 =0.0 15. July 2007 6:00-6:00 UTC Moisture Flux Convergence + 10 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-179.8, max= 152.9,  =4.2,  2 =2383.2 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.0, max=1.2,  =0.3,  2 =0.0

7. 7th COPS Workshop October 27-29 2008, Strasbourg VERA Analysis for IOP 9c 20. July 2007 6:00-6:00 UTC Moisture Flux Convergence + 3 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-323.8, max=204.5,  =-15.4,  2 =4407.8 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.1, max=2.5,  =0.7,  2 =0.2 20. July 2007 6:00-6:00 UTC Moisture Flux Convergence + 10 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-463.7, max=272.6,  =-24.9,  2 =8901.5 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.1, max=3.2,  =1.0,  2 =0.3

8. 7th COPS Workshop October 27-29 2008, Strasbourg VERA Analysis for IOP 13a 01. Aug. 2007 6:00-6:00 UTC Moisture Flux Convergence + 3 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-82.0, max=198.7,  =21.1,  2 =2324.2 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.1, max=3.2,  =0.8,  2 =0.4 01. Aug. 2007 6:00-6:00 UTC Moisture Flux Convergence + 10 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-135.3, max=256.0,  =28.3,  2 =4482.7 3m Wind [m/s]. Obs: n=96+, Analysis: min=0.2, max=4.0,  =1.1,  2 =0.7

9. 7th COPS Workshop October 27-29 2008, Strasbourg VERA Analysis for IOP 13b 02. Aug. 2007 6:00-6:00 UTC Moisture Flux Convergence + 3 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-244.1, max=199.9,  =-17.9,  2 =7446.4 3m Wind [m/s]. Obs: n=99+, Analysis: min=0.2, max=2.8,  =1.1,  2 =0.3 02. Aug. 2007 6:00-6:00 UTC Moisture Flux Convergence + 10 m Wind Moisture Flux Divergence [10 -4 gkg -1 s -1 ] Analysis: min=-394.4, max=277.3,  =-36.5,  2 =15658.3 3m Wind [m/s]. Obs: n=99+, Analysis: min=0.2, max=3.6,  =1.6,  2 =0.4

10. 7th COPS Workshop October 27-29 2008, Strasbourg Precipitation vs. Moisture Flux Convergence Significant jump in MFD at max. of precipitation

11. 7th COPS Workshop October 27-29 2008, Strasbourg Many thanks to FWF for the financial support of project no. P19658-N10.

12. 7th COPS Workshop October 27-29 2008, Strasbourg Thank you for your attention !

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

14. Classz0z0  30,032 40,107 50,2513 60,5019 71,0026 

15. 7th COPS Workshop October 27-29 2008, Strasbourg Terrain classification from Davenport (1960) adapted by Wieringa (1980b) in terms of aerodynamic roughness length z o Class Short terrain descriptionz o [m)] 1Open sea, fetch at least 5 km0,0002 2Mud flats, snow; no vegetation, no obstacles0,005 3Open flat terrain; grass, few isolated obstacles0,03 4Low crops; occasional large obstacles, x/H > 200,1 5High crops; scattered obstacles, 15 < x/H < 200,25 6Parkland, bushes; numerous obstacles, x/H ˜ 100,5 7Regular large obstacle coverage (suburb, forest)1 8City centre with high- and low-rise buildings>=2 © 2006, World Meteorological Organization X.. obstacles distance, H.. height of obstacles

16. 7th COPS Workshop October 27-29 2008, Strasbourg Class AngleDescription Exposed site0–5 Only a few small obstacles such as bushes, group of trees, a house Mainly exposed site6–12Small groups of trees or bushes or one or two houses Mainly protected site13–19 Parks, forest edges, village centres, farms, groups of houses, yards Protected site20–26 Young forest, small forest clearing, park with big trees, leeward of big hills © 2006, World Meteorological Organization

17. 7th COPS Workshop October 27-29 2008, Strasbourg