KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association INSTITUTE OF METEOROLOGY AND CLIMATE RESEARCH,

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Presentation transcript:

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association INSTITUTE OF METEOROLOGY AND CLIMATE RESEARCH, Atmospheric Environmental Research Verbesserungen von Windfeldmodellen (z.B. WRF) Richard Foreman, Stefan Emeis

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 2Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Weather Research and Forecast (WRF) model ( Mellor-Yamada-Janjic (MYJ) planetary boundary layer scheme: Turbulence closure of the atmospheric boundary layer equations (one equation model) Specification of the length scale, l Differential equation for TKE: ½ q 2 = ½ (u′ 2 + v′ 2 + w′ 2 ) Exchange coefficients solved algebraically Typical example for TKE and eddy viscosity (K m ) will be shown below

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 3Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Weather Research and Forecast (WRF) model (

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 4Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 5Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen WRF with original MYJ scheme (simulation for January 2005 compared to FINO1 data)

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 6Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Mellor-Yamada (1982) closure constants determined from laboratory data between Have these data been obtained for sufficiently high Reynolds numbers? Have these data been obtained by sufficiently small sensors close to the wall? Hutchins et al., J Fluid Mech 635, Marusic et al., Int J Heat & Fluid Flow 31,

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 7Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Length scale l dependent on stability according to Nakanishi (2001)

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 8Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen WRF with modified MYJ scheme (simulation for January 2005 compared to FINO1 data)

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 9Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen WRF with modified MYJ scheme (simulation for November 2005 compared to FINO1 data)

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 10Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen WRF with modified MYJ scheme (simulation for January 2005 compared to FINO1 and Hamburg data) Ti as function of wind speed

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 11Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen WRF with modified MYJ scheme (simulation for February 2005 compared to FINO1 and Høvsøre data) Ti as function of wind speed

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 12Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Conclusions: Updates to MYJ scheme include: - modified model constants - modified specification of length scale Better simulation of turbulence intensity (offshore and onshore) Mean wind speed simulation nearly unchanged Updated model is suited for the simulation of turbulence intensity Further updates possible: - parametrization of marine drag coefficient - influence of moisture fluxes on stability in the MABL

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 13Prof. Dr. Stefan Emeis – Verbesserungen von Windfeldmodellen Acknowledgements: Work is funded by the German Ministry of the Environment via Projektträger Jülich (PTJ) under grant # (project VERITAS) VERITAS has become part (AP 5) of project OWEA led by Prof. Kühn, Oldenburg, funded as above under grant # Hamburg weather mast data have been kindly provided by Ingo Lange and Burghard Brümmer, University of Hamburg, Centre for Marine and Atmospheric Sciences (ZMAW)

Institute for Meteorology and Climate Research – Atmospheric Environmental Research 14 Thank you for your attention