The Investigation of Moisture Flux Divergence from COPS

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

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

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

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

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

VERA Analysis for IOP 8 b 15. July 2007 6: 00 -6: 00 UTC Moisture Flux Convergence + 3 m Wind 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=-109. 5, max= 121. 8, m=5, 8, s 2=1164. 2 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 0, max=0. 9, m=0. 3, s 2=0. 0 Moisture Flux Divergence [10 -4 gkg-1 s-1] Analysis: min=-179. 8, max= 152. 9, m=4. 2, s 2=2383. 2 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 0, max=1. 2, m=0. 3, s 2=0. 0 7 th COPS Workshop October 27 -29 2008, Strasbourg

VERA Analysis for IOP 9 c 20. July 2007 6: 00 -6: 00 UTC Moisture Flux Convergence + 3 m Wind 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=-323. 8, max=204. 5, m=-15. 4, s 2=4407. 8 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 1, max=2. 5, m=0. 7, s 2=0. 2 Moisture Flux Divergence [10 -4 gkg-1 s-1] Analysis: min=-463. 7, max=272. 6, m=-24. 9, s 2=8901. 5 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 1, max=3. 2, m=1. 0, s 2=0. 3 7 th COPS Workshop October 27 -29 2008, Strasbourg

VERA Analysis for IOP 13 a 01. Aug. 2007 6: 00 -6: 00 UTC Moisture Flux Convergence + 3 m Wind 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=-82. 0, max=198. 7, m=21. 1, s 2=2324. 2 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 1, max=3. 2, m=0. 8, s 2=0. 4 Moisture Flux Divergence [10 -4 gkg-1 s-1] Analysis: min=-135. 3, max=256. 0, m=28. 3, s 2=4482. 7 3 m Wind [m/s]. Obs: n=96+, Analysis: min=0. 2, max=4. 0, m=1. 1, s 2=0. 7 7 th COPS Workshop October 27 -29 2008, Strasbourg

VERA Analysis for IOP 13 b 02. Aug. 2007 6: 00 -6: 00 UTC Moisture Flux Convergence + 3 m Wind 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=-244. 1, max=199. 9, m=-17. 9, s 2=7446. 4 3 m Wind [m/s]. Obs: n=99+, Analysis: min=0. 2, max=2. 8, m=1. 1, s 2=0. 3 Moisture Flux Divergence [10 -4 gkg-1 s-1] Analysis: min=-394. 4, max=277. 3, m=-36. 5, s 2=15658. 3 3 m Wind [m/s]. Obs: n=99+, Analysis: min=0. 2, max=3. 6, m=1. 6, s 2=0. 4 7 th COPS Workshop October 27 -29 2008, Strasbourg

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

Many thanks to FWF for the financial support of project no. P 19658 -N 10. 7 th COPS Workshop October 27 -29 2008, Strasbourg

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

7 th COPS Workshop October 27 -29 2008, Strasbourg

Class z 0 a 3 0, 03 2 4 0, 10 7 5 0, 25 13 6 0, 50 19 7 1, 00 26 a 7 th COPS Workshop October 27 -29 2008, Strasbourg

Terrain classification from Davenport (1960) adapted by Wieringa (1980 b) 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) 1 8 City centre with high- and low-rise buildings >=2 X. . obstacles distance, H. . height of obstacles © 2006, World Meteorological Organization 7 th COPS Workshop October 27 -29 2008, Strasbourg

Class Angle Exposed site 0– 5 Mainly exposed site 6– 12 Mainly protected site 13– 19 Protected site 20– 26 Description Only a few small obstacles such as bushes, group of trees, a house Small groups of trees or bushes or one or two houses Parks, forest edges, village centres, farms, groups of houses, yards Young forest, small forest clearing, park with big trees, leeward of big hills © 2006, World Meteorological Organization 7 th COPS Workshop October 27 -29 2008, Strasbourg

7 th COPS Workshop October 27 -29 2008, Strasbourg

7 th COPS Workshop October 27 -29 2008, Strasbourg

7 th COPS Workshop October 27 -29 2008, Strasbourg