青藏高原上空温度场低频变化的垂直结构及其与热带海气的相互关系

VERTICAL STRUCTURE OF LOW FREQUENCY VARIATIONS OF THE TEMPERATURE FIELDS OVER THE QINGHAI XIZANG PLATEAU AND ITS RELATION WITH THE TROPICAL ATMOSPHERE/OCEANS

采用一点相关法研究了青藏高原东部对流层－平流层下部温度场低频变化的垂直结构，指出了最大负相关层的高度和强度随季节的变化特点，并与高原北部格尔木和我国东部（１２０°Ｅ、３０～５０°Ｎ）区域作了比较。从青藏高原对流层顶高度的季节变化、大气温度层结和动能垂直分布探讨了青藏高原温度场低频垂直结构及季节变化的物理背景。并指出：秋季１０～１１月青藏高原东部垂直热力结构、赤道印度洋－太平洋的两个纬向垂直Ｗａｌｋｅｒ环流圈强度与赤道东太平洋（０～１０°Ｓ、１８０～９０°Ｗ）区域ＳＳＴＡ之间具有极为密切的耦合关系。

The vertical structure of the low frequency variations of the temperature fields from the troposphere to the lower stratosphere over the eastern part of the Qinghai Xizang Plateau is studied in this paper using the single correlation method. The seasonal variation features of the height and intensity of maximum negative correlation layer are pointed out,and are compared with circumstances at Geermu in the northern part of the plateau and in the northern region of China (120 °E,30～50 °N) . The physical reasons for the low frequency vertical structure and seasonal variations of the temperature fields over the Qinghai Xizang plateau is discussed in terms of seasonal changes of the tropopause, atmospheric temperature stratification and vertical profiles of kinetic energy over the plateau. At last, it is investigated and pointed out that the Autumn(October November )atmospheric thermal structure over the eastern part of the plateau and the intensity of two Walker circulation cells over the equatorial Indian Ocean to the equatorial Pacific ocean are closely related with the SSTA(0～10 °S,180～90 °W )from October to January.