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Investigation of Turbulence Structures in the Stable Stratified Boundary Layer with the LM

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.

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Investigation of Turbulence Structures in the Stable Stratified Boundary Layer with the LM

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  1. Investigation of Turbulence Structures in theStable Stratified Boundary Layerwith the LM Marc Krebsbach and Günther Heinemann • turbulence closure schemes in the LM • simulations • summary photo: G. H.

  2. turbulence closure schemes in the LMdiagnostic scheme prognostic scheme • closure order 1.5 with prog. TKE • ‘level 2’ (Mellor & Yamada, 1982) • more terms • vertical diffusion of TKE • expanded solution under stable conditions • additional item: circulation term with • modified procedure after Müller (1981) solutions in terms of 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

  3. simulations model area around Kangerlussuaq Greenland map Pa  Pb  100 km

  4. simulationsdiagnostic scheme prognostic scheme grid point height AGL in m

  5. simulationsdiagnostic scheme grid point height AGL in m height AGL in m

  6. simulationsprognostic scheme grid point height AGL in m height AGL in m

  7. 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 jump

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