季风低压对台风生成影响的观测分析被引量：1

Influence of North-West Pacific monsoon depression on tropical cyclogenesis

下载PDF

导出

摘要选取2007年和2009年发生的4个季风低压个例,利用FNL资料和CMORPH卫星反演的降水资料,采用多尺度环流分析法,对西北太平洋季风环流的多尺度特征进行了分析,研究季风低压对台风生成的可能影响。分析发现:季风低压生成于季风槽中,其天气尺度波列的气旋性环流中。虽然以季风槽为特点的低频环流为台风生成提供大尺度气候条件,但是季风低压通过进一步提供较大的正相对涡度,可以有效减小Rossby变形半径,促进热带低压中中尺度对流系统的相互作用和合并,有利于台风的生成。 By using the FNL data and CMORPH precipitation data and based on the multiscale circulation analysis,four monsoon depressions in 2007 and 2009 were selected to analyze the multiscale characteristics of monsoon circulation in Northwest Pacific. Moreover,the possible effects of monsoon depression on tropical cyclogenesis were also explored. Results show that the monsoon depressions usually develop in the cyclonic circulation with synoptic-scale wave trains originated from the monsoonal confluence zone of the monsoon trough. Although the low-frequent circulation characterized by monsoon trough provides large-scale climatic conditions for tropical cyclones genesis,the monsoon depression contributes additional positive vorticity to enhance the merger of mesoscale convective systems by reducing the Rossby radius of deformation.

作者邱文玉吴立广

机构地区南京信息工程大学气象灾害省部共建教育部重点实验室

出处《气象科学》北大核心 2015年第3期237-247,共11页 Journal of the Meteorological Sciences

基金国家自然科学基金资助项目(41275093 41305050)

关键词台风季风低压季风槽中尺度对流系统 Tropical cyclone Monsoon depression Monsoon trough Mesoscale convective system

分类号 P458.124 [天文地球—大气科学及气象学]

引文网络
相关文献

参考文献36

1Ramanathan K R, Ramakrishnan K P. The Indian Southwest Mon-soon and the structure of depressions associated with it. Memoirs of the India Meteorological Department, 1933, 26( 11 ) : 13-36.
2Douglas M W. Structure and dynamics of two monsoon depressions. Part I: Observed structure. Mon. Wea. Rev., 1992, 120(8): 1524-1547.
3梁必骐,邹美恩,李勇,等.南海季风低压的活动和结构特征.热带海洋学报,1985,4(4):60-67.
4ZHAO Sixiong, Graham A M. A study of a monsoon depression bringing record rainfall over Australia. Part lI: Synoptic-diagnostic description. Mon. Wea. Rev., 1991, 119(9): 2074 - 2094.
5Hart P A, Elsberty R L, Chan J C 1,. Transformation of a large monsoon depression to a tropical storm <luring TCM-93. Mon. Wea. Rev., 1996, 124(12) : 2625-2643.
6Beattie J C, Elsben'y R L. Western north Pacific monsoon depres- sion formation. Wea. Forecasting, 2012, 27(6): 1413-1432.
7JTWC. Tropical cyclone report. Joint Typhoon Warning Center, 1994: 337.
8Lander M A. Monsoon depressions, monsoon res, midget tropi- cal cyclones, TUTT cells and high intensity after tcur','ature: Les-sons learned from use of Dvorak' s techniques in the world' s most prolific tropical-cyclone basin jj Preprints, 26th conf. on hurri- canes and tropical meteorology. Miami, FL, Amer. Meteor. Soc., 2004:7A. 5.
9Sadler J C. A role of the tropical upper tropospheric trough in early season typhoon development. Mon. Wea. Rev., 1976, 104(10) : 1266-1278.
10Gray W M. Global view of the origin of tropical disturbances and storms. Mon. Wea. Rev., 1968, 96(10) : 669-700.