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With high resolution(1 km),the distribution of wind energy resources in Hainan province and over its offshore waters is numerically simulated by using the Wind Energy Simulation Toolkit(WEST)model developed by Meteorological Research Branch of Environment Canada.Compared with observations from eight coastal anemometric towers and 18 existing stations in the province,the simulations show good reproduction of the real distribution of wind resources in Hainan and over its offshore waters,with the relative error of annual mean wind speed being no more than 9% at the 70-m level.Moreover,based on the simulated results of WEST grids that are closest to where the eight wind towers are located,the annual mean wind speeds are further estimated by using the Danish software WasP(Wind Atlas Analysis and Application Program).The estimated results are then compared with the observations from the towers.It shows that the relative error is also less than 9%.Therefore,WEST and WEST+WAsP will be useful tools for the assessment of wind energy resources in high resolution and selection of wind farm sites in Hainan province and over its offshore waters.