热带气象学报2013，Vol.29Issue(3)：474-480,7.DOI:10.3969/j.issn.1004-4965.2013.03.014
海南岛地形对南海西行台风降水影响的数值试验
NUMERICAL SIMULATIONS OF THE HAINAN ISLAND TOPOGRAPHIC EFFECTS ON THE RAINFALL OF WEST-GOING TYPHOONS
摘要
Abstract
Numerical simulation and terrain sensitivity experiments on Typhoon "Damrey" between September 25 and 27,2005 were conducted using the Weather and Research Forecast (WRF) model.The results show that the rainfall caused by the west-going typhoon making landfall on the middle of the island distributes more in the south than in the north and there is more rain in the middle than the two sides in the southern area of the island.48 h and 3 h accumulative rainfall from a 12 km experiment is successfully modeled and the landing time and location is close to the observation.A terrain sensitivity experiment shows that 48 h precipitation with terrain increases generally by more than 50 mm over Hainan Island.Increases of more than 100 mm are observed in the central and southern regions.Two peaks of heavy precipitation (200 ～300 mm) are found to respond to two main mountain peaks,which proves the role of terrain in general rainfall increase in typhoons.In addition,there exists a 50-mm reduction in rainfall in the eastern coast of the island.Analysis of the comparison of low-level mesoscale flow fields,the geopotential height fields and the vertical velocity shows significant differences between the control experiment and the experiment without terrain.The Wuzhishan terrain can enhance low-level disturbances,which can easily produce the vortex of mesoscale convection system (MCS),thereby increasing the typhoon rainfall.关键词
热带气旋/暴雨/数值模拟/试验/海南岛/地形Key words
tropical cyclone/ rainfall/ numerical simulation/ experiment/ Hainan island/ terrain分类
天文与地球科学引用本文复制引用
杨仁勇,闵锦忠,冯文..海南岛地形对南海西行台风降水影响的数值试验[J].热带气象学报,2013,29(3):474-480,7.基金项目
国家自然科学基金项目(40975068)) （40975068）
国家科技支撑课题(2013BAK05B03)共同资助 （2013BAK05B03）
