Structure of Convective Turbulence and Turbulent Fluxes over Complex Terrain during VERTIKATOR

1. Structure of Convective Turbulence and Turbulent Fluxes over Complex Terrain during VERTIKATOR Ch. Kottmeier, M. Hasel, U. Corsmeier, N. Kalthoff Institut für Meteorologie und Klimaforschung, Universität Karlsruhe Ch. Kottmeier et al., ICAM 2003

2. Structure of Convective Turbulence and Turbulent Fluxes over Complex Terrain during Vertikator Ch. Kottmeier, M. Hasel, U. Corsmeier, N. Kalthoff Institut für Meteorologie und Klimaforschung, Universität Karlsruhe • Vertical Exchange and Orography • Coordinator: Franz Fiedler, Karlsruhe • 2 Experiments in Alpine and Prealpine Mountains in 2002 • 6 Agencies, 8 Subprojects Ch. Kottmeier et al., ICAM 2003

3. Convection over mountains such as Black Forest is found most variable Ch. Kottmeier et al., ICAM 2003

4. KA Hornisgrinde Freudenstadt Convection over mountains such as Black Forest is found most variable Ch. Kottmeier et al., ICAM 2003

5. Hornisgrinde Murgtal KAMM 1 Simulation (H. Noppel, IMK, 2003) Ch. Kottmeier et al., ICAM 2003

6. Convection over mountains such as Black Forest controlled by: • all factors affecting local surface heating • induced mesoscale flows KAMM Model Simulation H. Noppel, 2003 Ch. Kottmeier et al., ICAM 2003

7. Convection over mountains such as Black Forest controlled by: • all factors affecting local surface heating • induced mesoscale flows • synoptic scale flow and orographic flow interaction Alps Ch. Kottmeier et al., ICAM 2003

8. thermo/hydro control deeply potentially unstable | | deep convection mesoscale circulations/ lifting inversions present | | | forced lifting shallow convection inhibiting factors: weak surface heating no convection dynamical control weak ---------------- synoptic flow ------- strong Ch. Kottmeier et al., ICAM 2003

9. Questions adressed • Heating and height of the mountaineous convective layer • Structure of convective turbulence Ch. Kottmeier et al., ICAM 2003

10. 14 Ground stations • 2 radiosondes • 1 tethered balloon • 1 Radar-RASS • 2 SODARs • 1 Aerosol-LIDAR • 2 surface energy balance stations • 4 turbulence measurements • 5 aircraft • flight pattern of DO-128, D-IBUF Ch. Kottmeier et al., ICAM 2003

11. sawpattern flights of RF5 + 2-hourly radiosondes to get boundary layer heights Ch. Kottmeier et al., ICAM 2003

12. Mixing heights from T und q Ch. Kottmeier et al., ICAM 2003

13. Height of convectively mixed layer previous (glider record) day: hmix differs by 1200 m h differs by 1000 m Ch. Kottmeier et al., ICAM 2003

14. Height of convectively mixed layer morning flight: hmix differs by 2000 m h differs by 1000 m previous (glider record) day: hmix differs by 1200 m h differs by 1000 m Ch. Kottmeier et al., ICAM 2003

15. Height of convectively mixed layer afternoon flight: hmix differs by 1800 m morning flight: hmix differs by 2000 m h differs by 1000 m previous (glider record) day: hmix differs by 1200 m h differs by 1000 m Ch. Kottmeier et al., ICAM 2003

16. Turbulent heat fluxes above flight sections at different heights, morning flight Ch. Kottmeier et al., ICAM 2003

17. Turbulent heat fluxes above flight sections at different heights, afternoon flight Ch. Kottmeier et al., ICAM 2003

18. Turbulent latent heat fluxes above flight sections at different heights, afternoon flight Ch. Kottmeier et al., ICAM 2003

19. Ch. Kottmeier et al., ICAM 2003

20. Selection of thermals, lead series:w‘ Ch. Kottmeier et al., ICAM 2003

21. 2000 m MSL Total numbers of classified up- and downdrafts, afternoon flight 1000 m MSL Ch. Kottmeier et al., ICAM 2003

22. z/zi = 0.2 Composite structure of thermals and contribution to covariances (fluxes of heat and moisture) Ch. Kottmeier et al., ICAM 2003

23. z/zi = 0.54 z/zi = 0.2 Composite structure of thermals and contribution to covariances (fluxes of heat and moisture) Ch. Kottmeier et al., ICAM 2003

24. Wachstum der Murgtalzelle 1 June 19, 2002, afternoon: Cell development observed by Radar and aircraft data. (I. Bertram, IMK, 2002) Ch. Kottmeier et al., ICAM 2003 ulrich.corsmeier@imk.fzk.de

25. Ch. Kottmeier et al., ICAM 2003