热带气象学报2001，Vol.17Issue(2)：144-154,11.
非纬向高空急流与远距离台风中尺度暴雨的研究
THE STUDY OF STORM RAINFALL CAUSED BY INTERACTION
BETWEEN THE NON-ZONAL HIGH LEVEL JET STREAK
AND THE FAR DISTANT TYPHOON
摘要
Abstract
In this paper, correlation statistics and analysis between the storm rainfall far from typhoon and non-zonal high level jet streak(NHJ) were carried out. The results show that: The high level jet streak(HJ) in 200 hPa is constantly SW(90.2 percent) during the period of which storm rainfall occurs. Rainfall area lies in the right behind regions of HJ axes. While storm is being intensive, the HJ has a trend that non-zonal feature become stronger. In terms of MM4 model, numerical simulation and diagnosis were carried out for 9711 typhoon on 19th to 20th August, 1997. The far distant rainfall storm is tightly correlative to the NHJ and low level typhoon trough. The divergence field of HJ is related to v component. The upper level can caused the allobaric wind convergence at low level. This is the result of the form of low level typhoon trough and the strength of the storm. By scale analysis , there exists one branch of middle scale transverse inverse circulation in the right entrance regions behind the HJ below the 300 hPa level, which is very important to the keeping and strengthening of rainfall storm. This branch of inverse circulation is relative to the reinforcement of HJ's non-zonal characteristics. From the field of middle scale divergence field and non-zonal wind field we can find that: The stronger symmetry caused by transverse circulation in the two sides of HJ, rainfall's feedback and reinforcement of HJ's non-zonal characteristics leaded to positive feedback mechanism that was favorable of storm rainfall's strengthening.关键词
非纬向高空急流/远距离台风中尺度暴雨/动力减压分类
天文与地球科学引用本文复制引用
丁治英,张兴强,何金海,徐海明..非纬向高空急流与远距离台风中尺度暴雨的研究[J].热带气象学报,2001,17(2):144-154,11.
