A note on surface layer parameterizations in the weather research and forecast model |
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| Institution: | 1. Centre of Excellence in Disaster Mitigation and Management, Indian Institute of Technology Roorkee, Roorkee, India;2. Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Delhi, India;3. School of Earth and Environment, University of Leeds, Leeds, UK;4. School of Natural Resource Management, Department of Environmental Sciences, Central University Jharkhand, India;1. St. Petersburg State University, 7–9, Universitetskaya nab., St. Petersburg 199034, Russia;2. NIERSC, Nansen International Environmental and Remote Sensing Centre, 14th line, 7, St. Petersburg 199034, Russia;3. Arctic and Antarctic Research Institute, Bering str., 38, St. Petersburg 199397, Russia;4. Pacific Oceanological Institute of the Russian Academy of Sciences, 43 Baltiiskaya St., 690041 Vladivostok, Russia;1. St. Petersburg State University, 7/9 Universitetskaya nab, St. Petersburg 199034, Russia;2. Nansen International Environmental and Remote Sensing Centre, 7, 14-th Line V. O., St. Petersburg 199034, Russia;1. Dept. of Atmospheric Sciences, School of Marine Sciences, Cochin University of Science and Technology, Kochi, India;2. Advance Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Kochi, India;3. Physical Oceanography Division, National Institute of Oceanography, Dona-Paula, India |
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| Abstract: | Two surface layer parameterization schemes along with five planetary boundary layer (PBL) schemes in the Weather Research and Forecasting model (WRF) are analyzed in order to evaluate the performance of the WRF model in simulating the surface variables and turbulent fluxes over an Indian sub-continent region. These surface layer schemes are based on the fifth-generation Pennsylvania State University—National Center for Atmospheric Research Mesoscale Model (MM5) parameterization; (a) Old MM5 scheme having Businger-Dyer similarity functions and (b) revised MM5 scheme utilizing the functions that are valid for full ranges of atmospheric stabilities. The study suggests that each PBL scheme can reproduce the diurnal variation of 2 m temperature, momentum flux and sensible heat flux irrespective of the surface layer scheme used for the simulations. However, a comparison of model-simulated values of surface variables and turbulent fluxes with observed values suggests that each PBL scheme is found to systematically over-estimate the nocturnal 2 m temperature and 10 m wind speed with both the revised and old schemes during stable conditions. |
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| Keywords: | Parameterization Surface flux WRF model |
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