气象科学2012，Vol.32Issue(3)：310-316,7.DOI:10.3969/2012jms.0040
南亚高压和高低空急流对2010年浙江梅汛期暴雨的影响
The effect of south Asia high and upper and lower-level jets on Meiyu rainstorm in Zhejiang province during 2010
李洪权 1陈中赟 1骆丽楠 1杨军 2刘双喜1
作者信息
- 1. 湖州市气象局,浙江湖州313000
- 2. 浙江省气象台,杭州310017
- 折叠
摘要
Abstract
Using the conventional data and NCEP/NCAR reanalysis data, this paper analyses the rainfall characters in Meiyu period of Zhejiang province during 2010 and the effects of South Asia high and upper and lower-level jets on Meiyu rainstorm. The results show that(l ) The beginning and the ending of Meiyu in Zhejiang province during 2010 were later,and the Meiyu period was obviously longer; the precipitation was more, and heavy precipitation concentrated on southwest of Zhejiang province, moreover it showed gradual decrease step by step towards south and north; rainstorm processes were frequent and concentrated. (2) In Meiyu period,the body of South Asia high was stronger,south-north oscillation and east-west sway were obvious in the process of the gradual strengthening, and south-north oscillation synchronized with westward and eastward shift. There was corresponding between south-north oscillation of South Asia high ridge line and south-north shift of rainstorm. Rainstorm was possible whether South Asia high was stable or changed. Rainstorm mostly occurred when South Asia high changed,and southward movement was synchronous with westward,northward was synchronous with eastward. (3) In Meiyu period, the evolution of upper and lower-leve! jets was consistent, and there was space-time corresponding between upper and lower-level jets and rainstorm. Rainstorm belt was mostly located in the right side of upper-level jet and the left side of lower-level jet axis, and it swayed south-north with the location of upper and lower-level jets. Moreover, to a certain degrees, the movement of lower-level jet from axis to north edge was coincident with rainstorm belt. The intensity of upper and lower-level jets was closely related to rainfall. The horizontal distance had important influence on the coupling between upper and lower-level jets,and then it effected the development of vertical velocity and precipitation intensity. Therefore,the configuration of upper and lower-level jets has good indication to area and intensity of rainstorm in Meiyu period.
关键词
暴雨/南亚高压/高低空急流Key words
Rainstorm/ South Asia high/ Upper and lower-level jets
分类
天文与地球科学引用本文复制引用
李洪权,陈中赟,骆丽楠,杨军,刘双喜..南亚高压和高低空急流对2010年浙江梅汛期暴雨的影响[J].气象科学,2012,32(3):310-316,7.
