作　　者： ; ;

机构地区： 中山大学环境科学与工程学院大气科学系

出　　处： 《高原气象》 1995年第4期425-433,共9页

摘　　要： 利用有限区域五层原始方程模式进行了青藏高原隆起过程对亚洲夏季风形成作用的数值试验。对高原主体共设计了平均高度分别为１０００ｍ，２０００ｍ，３０００ｍ，３５００ｍ和４０００ｍ５组试验。结果表明：（１）高原及其东南侧的热源随着高原的隆起而加强，其中从３０００ｍ到３５００ｍ的隆起所引起的热源变化呈“突变”性质，迅速加强的热源将引起季风环流产生相应的明显变化。（２）当高原隆起达３５００ｍ时，南亚高压出现，热带东风明显加强，同时地面低压中心迅速西移上高原；当高原隆起高于３５００ｍ后，作为高原夏季风环流显著特征之一，即在高原上上升而在其两侧下沉的经圈环流就得以完整地建立；高原季风叠加在海陆季风上，使亚洲夏季风更为强大。（３）高原隆起所引起的降水量增加和减少主要分别位于高原的东南侧和孟加拉湾的东岸附近，此外。 Five sets of numerical experiments were performed by using a five-layer limited area primitive equation model Among them,one is for real topagraphy with mean height of 4 000m;and the others are for the heights of 1 000m,2 000m, 3 000m, 3 500m,respectively Their results were compared each other It was shown that: (1) The atmospheric heat source over the Tibetan Plateau and its southeast neighbourhood strengthened with the rising of the Plateau Especially,when the mean height of Plateau was rised from 3 000m to 3 500m,the intensity of the heat source increased significantly and correspondently,the Asian summer monsoon circulations were changed obviously (2) When the mean height of Plateau was rised to 3 500m,the South Asian high in the upper troposphere appears,and the tropical easterly to the south of the high center was strengthened considerably Meanwhile,the low-level thermal low over the Asian continent moved westward to over the Plateau rapidly If the Plateau rised higher than 3 500m,the monsoon meridional cell,with the ascending branch over the Plateau and the two descending branches to the north and south sides of Plateau respectively,was seted up completely As a result of adding of the Plateau monsoon to the monsoon caused by the thermal difference between sea and continent,the Asian summer monsoon was strengthened considerably (3) In response to the rising of Tibetan Plateau,the distribution of rainfall was also changed The positive (increasing) and negative(decreasing) rainfall centers were located in the southeast side of the Plateau and the east coast of the Bay of Bengal,respectively

关 键 词： 夏季风 青藏高原隆起 季风 数值试验

领　　域： [天文地球]