南亚夏季风爆发前后流场的演变特征  

Evolution character of flow field during onset phase of the Indian summer monsoon

作　　者：朱敏[1] 张铭[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《解放军理工大学学报（自然科学版）》2006年第2期189-194,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40233027)

摘　　要：为研究南亚夏季风爆发前后流场的演变特征,利用诊断分析方法,对影响季风爆发的因子作了分析。结果表明,南亚季风的爆发与高层青藏高压的西进北抬、中层的爆发性涡旋的生成和低层索马里急流的加强密切有关。在季风爆发正常年份,青藏高压活动表现为北抬—西进—北抬形态,季风爆发前其西进明显。季风爆发偏晚时索马里急流的经向输送比爆发偏早时的要强。在季风爆发前,大多数年份在印度次大陆西海岸对流层中层有爆发性涡旋生成。In order to research on the evolution character of flow field before and after the onset of Indian summer monsoon, the factors affecting the monsoon onset were analyzed by means of diagnosis. It is found that the onset of Indian summer monsoon is closely related to the northwestward advance of Tibetan high, the midtropospheric onset-vortex and the reinforcing of cross-equatorical current. In the normal onset year, the movement of Tibetan high is northward, westward and northward, and the westward movement is evident before onset. The meridional transportation of cross-equatorical current in later onset year is stronger than that in the earlier onset year. The onset-vortex forms at the midtropospheric levels over the west seacoast of India subcontinent during most years before onset.

关 键 词：南亚夏季风 流场 演变 

分 类 号：P435[天文地球—大气科学及气象学]