Preliminary validation results of the prognostic 3d-TKE-scheme

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Institut für Meteorologie und Klimatologie Universität Hannover

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Presentation transcript:

Preliminary validation results of the prognostic 3d-TKE-scheme Gerd Vogel, Ursula Schubert DWD Potsdam Zurich, September 2005 FE 14

Outlook Operational LM-prediction May 30, 2004 Lindenberg

Outlook May 30, 2004 Op. scheme (3tls) Mellor&Yamada (3tls) 3d pTKE-scheme Mellor&Yamada (2tls, ALM) May 30, 2004 Meteorol.and Atm. Physics, 2005, 88, 23-38 Gassmann, A.:

Data of vertical sounding systems available from MO Lindenberg (DWD) Operational radiosonde ascents (temperature, humidity, wind components, every 6 hours, up to 25 km) LIDAR-measurements (water vapour, all 10 min between 500m - 2000m, provided by MPI Hamburg only during field experiments) Microwave profiler data (temperature , all 10 min, up to 25 km) Windprofiler-, RASS-, SODAR-systems (wind components , virtual temperature, all 10 min, 200m-3000m) Data of vertical sounding systems available from MO Lindenberg (DWD)

Outlook Average over 8 days (weak winds only) in May and June 2004 (Lindenberg)

Outlook Average over 8 days (weak winds only) during May and June 2004 (Lindenberg)

Prognostic 3d-TKE scheme Microwave data Prognostic 3d-TKE scheme Comparisons with operational cross-sections based on LME-predictions daily available: http://www.dwd.de/de/FundE/Observator/MOL/mol1/passiv/mol1_pasf_e.htm

Basic features of the prognostic 3d-TKE scheme (momentum) specified flux components: (heat) simplified anisotropic diffusion approach Prandtl-Kolmogorov- specification of vertical diffusion aspect ratio [Dunst (1980)]

Outlook Vertical velocity (12 UTC) 400 m LMK 1d pTKE LMK 3d pTKE

Vertical velocity (12 UTC) Outlook Vertical velocity (12 UTC) LMK 1d pTKE LMK 3d pTKE

Zonal height-cross section (j=175) Vertical velocity 12 UTC LMK 1d pTKE LMK 3d pTKE

Conclusions A proper accuracy check of the turbulence parameterisations used in the LM will only be possible if the model forcing from the surface has been improved. It’s intended to replace soil moisture, precipitation and radiation balance values at surface by measurements (or simulated data basing on them like soil moisture) in the whole LMK area. Versatile vertical soundings available from Lindenberg (DWD) enable us to study thoroughly the changing boundary layer structures during the day. Based on them the model behaviour can be evaluated more comprehensively due to continuous comparisons between measured and simulated meteorological quantities along the vertical. The implementation of the horizontal heat and momentum fluxes improves the phy-sical content of the scheme. In order to find out how accurately the present prognostic 3d-TKE scheme describes the reality (e.g. simulation of convection rolls), further validation studies are necessary, also including satellite data which often reveal such convection rolls in nature, too.