摘要
利用1958—1997年40年华北地区逐月降水资料与南亚高压的特征参数进行比较,分别检验了同一年6月南亚高压中心经度和前一年6月高压中心强度与华北夏季降水的相关性。从100hPa流场形势、低层到高层速度势和流函数的上下配置、辐合辐散风场以及涡旋风场的高低空配置等不同方面讨论了南亚高压对华北夏季降水的影响机制。结果表明,如果当年6月南亚高压的位置偏西,华北夏季降水就有可能增加。
Based on the monthly rainfall data at 17 stations in North China from 1958 to 1997, the correlations between the South Asian High(SAH) in the area of 30°W～180°E, 0°～60°N and the summer rainfall in North China are analyzed. The atmospheric circulation at 100 hPa, the stream function and the velocity potential at different heights are composed and discussed in order to depict the mechanism of the influence of the South Asian High on precipitation in North China. The results show that the summer rainfall in North China and the South Asian High is negative correlated, that is to say, when the SAH is stronger, the rainfall will be less in the North China; when the SAH is located more westward, the heavier rainfall will be occur, and vice versa.
出处
《高原气象》
CSCD
北大核心
2003年第6期602-607,共6页
Plateau Meteorology
基金
国家重点基础研究发展规划项目"我国重大气候灾害的形成机理和预测理论研究"(1998040900)
国家自然科学基金项目"南亚高压和亚洲季风相互作用及其机理的研究"(40175021)资助
关键词
南亚高压
华北降水
流函数
速度势
涡旋场
辐合辐散场
South Asian High
Summer rainfall in North China
Stream function
Velocity potential
Vortex field
Convergence and divergence fields
