中文摘要：

使用WRF3.1模式对2008年12月4日、12月21日、2009年3月13日的三次冷空气造成的琼州海峡大风过程进行数值模拟和地形敏感性试验。模拟结果表明：水平格距4 km的模拟地面风场与实况接近,中尺度模式在大风的起风时间、持续时间、风速大小等方面有较强的预报能力,并能反映冷空气偏东路径与偏西路径过程中琼州海峡大风的不同分布特征。地形敏感性试验表明：由于南北两岸地形作用,在偏东北大风起风时段易产生地面风速增大的＂狭管效应＂,在海峡中间区域风速增大幅度为0.5～1.4 m/s,时间上狭管效应主要表现在大风过程的前6 h,从起风时次开始增大,一般在3 h后表现最强,之后随之减弱。

英文摘要：

Gale winds at Qiongzhou Strait caused by three cold air process on December 4 and 21,2008 and March 13,2009 were simulated using the Weather and Research Forecast（WRF） model.The results indicated that simulated surface wind field at 4 km grid intervals was close to ground truth.The WRF model showed relatively strong capability of forecasting the initial time and duration of wind,wind speed,and others,and captured different characteristics of the distribution of cold air passages through Qiongzhou Strait via eastern and western routes.A terrain-sensitivity experiment showed that terrain effect attributable to the north and south shores of the strait caused surface wind speed to increase rapidly,due to what is known as the ＂narrow-channel effect＂ during the initial time of northeasterly gales;the increase was in a range of 0.5~1.4 m/s in the middle of the strait.The ＂narrow-channel effect＂ mainly occurred during the first 6 h of the strong winds;the wind speed began to increase from the start of the enhancing time and generally became the strongest after 3 h and subsequently decreased.