海南岛附近四季风场的中尺度环流

SEASON'S WIND FIELDS OF MESOSCALE CIRCULATION IN HAINAN ISLAND

关键词:  四季风场  中尺度环流  数值模式

Key words:  Season's wind field  Mesoscale circulation  Numerical model

摘要:

采用一层σ坐标原始方程数值诊断模式研究海南岛、雷州半岛及其四周海域的地面风场特征。在春夏秋冬四季典型盛行气流下试验,均明显呈现绕流、爬坡、辐合线、海陆风和山谷风效应,看出在不同季节下的中尺度环流存在一定的差异。试验表明,区域内的复杂地形和海陆分布是形成各种中尺度环流的重要原因,同时,揭示出本地气候分布的特征与中尺度环流间存在密切的关系。

Abstract:

Using one-level numerical diagnostic model, the features of surface wind fields in Hainan Island and Leizhou Peninsula and nearby sea area are studied. In the experiments of prevailing sy noptic situation for different seasons in terms of by-passing and up-sloping flows, convergence lines,sea/land breeze and mountain/valley wind, are shown apparently, reflecting differences in the features of mesoscale distribution with season.The complex terrain and sea/land distributions in the area are the important cause to form varying mesoscale circulations,and then the close relationship between local climatic distributional feature and mesoscale circulation is revealed.