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Sensitivity of WRF simulated typhoon track and intensity over the South China Sea to horizontal and vertical resolutions

引用

Acta Oceanologica Sinica 2019年第7期38卷 74-83页

作者： Zhiyuan Wu Changbo Jiang Bin Deng Jie Chen Xiaojian Liu School of Hydraulic Engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China School for Marine Science and Technology University of Massachusetts DartmouthNew BedfordMA 02744USA Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation Ministry of Water ResourcesGuangzhou 510611China

To determine the grid resolutions of the WRF model in the typhoon simulation,some sensitivity analysis of horizontal and vertical resolutions in different conditions has been carried *** horizontal resolutions(5,10,20,30 km),nesting grids(15 and 5 km),different vertical resolutions(35-layers,28-layers,20-layers)and different top maximum pressures(1 000,2 000,3 500,5 000 Pa)had been used in the mesoscale numerical model WRF to simulate the Typhoon *** simulation results of typhoon track,wind speed and sea level pressure at different horizontal and vertical resolutions have been compared and *** horizontal and vertical resolutions of the model have limited effect on the simulation effect of the typhoon *** horizontal and vertical resolutions have obvious effects on typhoon strength(defined by wind speed)and intensity(defined by sea level pressure,SLP),especially for sea level *** typhoon intensity simulated by the high-resolution model is closer to the real situation and the nesting grids can improve computational accuracy and *** simulation results affected by vertical resolution using 35-layers is better than the simulation results using 20-layers and 28-layers *** comparison and analysis,the horizontal and vertical resolutions of WRF model are finally determined as follows:the two-way nesting grid of 15 and 5 km is comprehensively determined,and the vertical layers is 35-layers,the top maximum pressure is 2 000 Pa.

关键词： sensitivity analysis typhoon track and intensity horizontal and vertical resolutions Typhoon kai-tak WRF

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