摘要
以在广西沿海登陆的超强台风"威马逊"为研究对象。针对沿海山脉—十万大山,基于区域数值模式WRF3.4.1,开展敏感性数值试验。结果表明,WRF模式能够较好地模拟出台风移动的路径及降水的空间分布特征。十万大山山脉的存在有利于中低层的南北风在山脉周围抬升,而地形抬升作用是导致沿海发生强降水的有利条件之一。移除十万大山地形后,台风中心位置偏西,大气环流的改变使山脉周围水汽辐合减弱,此外,偏南气流由于没有地形的阻挡,因此向北发展,而地形造成的中低层抬升作用也随之消失。水汽辐合的减弱及地形抬升作用的消失共同导致十万大山周围降水减少,最大减幅可达到40mm。
Taking the extremely strong typhoon ＂Ramasun＂ which landed on Guangxi coastal area as a research object, the paper aimed at the coastal mountains——Cent Mille Monts and carried out the sensitive numerical experiment based on the regional numerical model WRF 3.4.1. The results showed that the WRF model simulated the path of typhoon movement and the spatial distribution characteristics of precipitation well. The existence of the Cent Mille Monts was beneficial to the uplift of the north and south winds at middle-low layers around the mountains, furthermore, the orographic lifting was one of the favorable conditions for causing severe precipitation at the coastal area. After moving the Cent Mille Monts in the simulation, the center of typhoon was located at the west side, and the change of the atmospheric circulation made the convergence of water vapor around the mountains weaker. Except that,because there was no topographic barrier to impede the westward air current, it developed towards north and the uplift of middle-low layers caused by the terrain disappeared. The decrease of water vapor convergence and the disappearance of topographic uplifting resulted in the decrease of precipitation around Cent Mille Monts and the maximum decrease could be up to 40 mm.
作者
苏玉婷
林开平
肖志祥
黄小燕
Yuting;Xiao Zhiqiang(corresponding author） , Huang Xiaoyan3, Lin Kaiping2 （1.Guangxi Teachers Education University, Nanning Guangxi 530022;Guangxi Meteorological Observatory, Nanning Guangxi 530022;Guangxi Research Institute of Meteorological Disasters Mitigation, Nanning Guangxi 530022)
出处
《气象研究与应用》
2018年第1期11-14,I0002,共5页
Journal of Meteorological Research and Application
基金
国家自然科学基金项目:41575051
41765002
41465003
广西自然科学基金重点项目:2017GXNSFDA198030~~
关键词
台风“威马逊”
数值试验
地形作用
环流变化
typhoon ＂Ramasun＂
numerical experiment
topographic effect
change of the atmosphericcirculation
