structure of convective turbulence and turbulent fluxes over complex terrain during vertikator
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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. - PowerPoint PPT PresentationTRANSCRIPT
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
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
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
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 OrographyCoordinator: Franz Fiedler, Karlsruhe
• 2 Experiments in Alpine and Prealpine Mountains in 2002
• 6 Agencies, 8 Subprojects
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Convection over mountains such as Black Forest is found most variable
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Convection over mountains such as Black Forest is found most variable
KA
Freudenstadt
Hornisgrinde
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Hornisgrinde Murgtal
(H. Noppel, IMK, 2003)
KAMM 1 Simulation
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
KAMM Model SimulationH. Noppel, 2003
Convection over mountains such as Black Forest controlled by:
• all factors affecting local surface heating
• induced mesoscale flows
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
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
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
dynamical control
deeply potentially unstable
| |
weak ---------------- synoptic flow ------- strong
thermo/hydro control
inversions present | | |
inhibiting factors: weak surface heating
shallow convection
deep convection
no convection
mes
osca
le
circ
ulat
ions
/
liftin
g
forc
ed li
fting
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Questions adressed
• Heating and height of the mountaineous convective layer
• Structure of convective turbulence
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
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
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
sawpattern flights of RF5
+ 2-hourly radiosondes
to get boundary layer heights
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Mixing heights from und q
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
previous (glider record) day:
hmix differs by 1200 m
h differs by 1000 m
Height of convectively mixed layer
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
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
Height of convectively mixed layer
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
morning flight:
hmix differs by 2000 m
h differs by 1000 m
afternoon flight:
hmix differs by 1800 m
previous (glider record) day:
hmix differs by 1200 m
h differs by 1000 m
Height of convectively mixed layer
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Turbulent heat fluxes above flight sections at different heights, morning flight
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Turbulent heat fluxes above flight sections at different heights, afternoon flight
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Turbulent latent heat fluxes above flight sections at different heights, afternoon flight
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Selection of thermals, lead series:w‘
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Total numbers of classified up- and downdrafts, afternoon flight
2000 m MSL
1000 m MSL
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Composite structure of thermals and contribution to covariances (fluxes of heat and moisture)
z/zi = 0.2
May 20, 2003 Ch. Kottmeier et al., ICAM 2003
Composite structure of thermals and contribution to covariances (fluxes of heat and moisture)
z/zi = 0.2
z/zi = 0.54
May 20, 2003 Ch. Kottmeier et al., ICAM [email protected]
(I. Bertram, IMK, 2002)
Wachstum der Murgtalzelle 1
June 19, 2002, afternoon:Cell development observed by Radar and aircraft data.
May 20, 2003 Ch. Kottmeier et al., ICAM 2003