地形对副热带高压脊季节活动影响的数值模拟

采用Z-σ坐标系中的两维纬向平均模式,作了大尺度地形作用的敏感性模拟试验,结果发现,在太阳辐射加热作用下,大尺度地形将影响副高脊的季节活动,例如地形作用使得副高脊北移的季节时间提早,以及使得高压脊在地形峰附近停留时间较长。这与南亚高压季节活动的实况,以及有关地形的动力分析等均颇为相近。 

NUMERICAL SIMULATION OF INFLUENCES OF TOPOGRAPHY UPON SEASONAL MOVEMENT OF SUBTROPICAL HIGH RIDGE LINE

In this paper, the numerical simulation of the sensitivity for the large scale topography actions are made by using of the two dimensional zonal average modle in the Z-σ coordinates. It is found that the seasonal movement of subtropical high ridge is influenced by the large scale topography as well as the solar radiation heating. Such as,by the actions of topography the Northward movement of subtropical high ridge is shifted to an earlier time of season and the high ridge is maintained more long time near topography region. These results are in rather good agreement with the seasonal movement of southern Asia high and the dynamic analysis of topography actions.