Advances in Science and Research www.adv-sci-res.net 1992-0628 1992-0636 2 7th EMS Annual Meeting and 8th European Conference on Applications of Meteorology 2007 2008 10.5194/asr-2-151-2008 http://www.adv-sci-res.net/2/151/2008/ http://www.adv-sci-res.net/2/151/2008/asr-2-151-2008.html http://www.adv-sci-res.net/2/151/2008/asr-2-151-2008.pdf 151 157 2009-04-27 Sensitivity study of surface wind flow of a limited area model simulating the extratropical storm Delta affecting the Canary Islands C. Marrero cmarrero@inm.es O. Jorba E. Cuevas J. M. Baldasano Izaña Atmospheric Research Center, Meteorological State Agency of Spain (AEMET), Tenerife, Spain Earth Sciences Department, Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona, Spain Environmental Modelling Laboratory, Technical University of Catalonia, Barcelona, Spain In November 2005 an extratropical storm named Delta affected the Canary Islands (Spain). The high sustained wind and intense gusts experienced caused significant damage. A numerical sensitivity study of Delta was conducted using the Weather Research & Forecasting Model (WRF-ARW). A total of 27 simulations were performed. Non-hydrostatic and hydrostatic experiments were designed taking into account physical parameterizations and geometrical factors (size and position of the outer domain, definition or not of nested grids, horizontal resolution and number of vertical levels). The Factor Separation Method was applied in order to identify the major model sensitivity parameters under this unusual meteorological situation. Results associated to percentage changes relatives to a control run simulation demonstrated that boundary layer and surface layer schemes, horizontal resolutions, hydrostaticity option and nesting grid activation were the model configuration parameters with the greatest impact on the 48 h maximum 10 m horizontal wind speed solution. 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