investigation of turbulence structures in the stable stratified boundary layer with the lm
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Investigation of Turbulence Structures in the Stable Stratified Boundary Layer with the LM. Marc Krebsbach and Günther Heinemann. turbulence closure schemes in the LM simulations summary. photo: G. H. turbulence closure schemes in the LM diagnostic scheme prognostic scheme. - PowerPoint PPT PresentationTRANSCRIPT
photo: G. H.
Investigation of Turbulence Structures in the
Stable Stratified Boundary Layerwith the LM
Marc Krebsbach and Günther Heinemann
turbulence closure schemes in the LM simulations summary
turbulence closure schemes in the LMdiagnostic scheme prognostic scheme
Mellor, G. L. and T. Yamada: 1982, ‘Development of a Turbulence Closure Model for Geophy-sical Fluid Problems‘. Rev. Geophys. Space Phys. 20(4), 851–875
Müller, E.: 1981, ‘Turbulent flux parameterisation in a regional scale model‘. ECMWF workshop proceedings, 25.–27. November, 193–220
23 2212 NKMKle hm
‘level 2’ (Mellor & Yamada, 1982)
223
221 RiRiRiR f
solutions in terms of
modified procedure after Müller (1981)
with
z
z
1
more terms
vertical diffusion of TKE
expanded solution under stable conditions
additional item: circulation term
closure order 1.5 with prog. TKE
simulations
Greenland map
model area around Kangerlussuaq
Pa Pb 100 km
simulationsdiagnostic scheme prognostic scheme
grid point
heig
ht A
GL
in
m
simulationsdiagnostic scheme
grid point
height AG
L in mhe
ight
AG
L in
m
simulationsprognostic scheme
heig
ht A
GL
in
mheight A
GL
in m
grid point
summary
LM is able to simulate complex flow structures in tundra region different reaction to variations of closure length
mean quantities: accurate for diagnostic scheme, some disadvantages in the lowest 100 m AGL
turbulent quantities: clear advantage of the prognostic scheme
no pattern length scale in the investigated SBL closure length has to be adapted to the SBL
turbulent fluxes: max. ; mean o.k.
successful simulation of a hydraulic jumpOBSLM FF 2