气象2016，Vol.42Issue(3)：294-304,11.DOI:10.7519/j.issn.1000-0526.2016.3.004
一次温带气旋涡度场演变特征及气旋发生发展机制分析
An Analysis of Vorticity Evolution and Physics Mechanism on an Extratropical Cyclone
摘要
Abstract
As cyclone is vortex,the parameter relative vorticity (for brevity,vorticity)can be used to ex-actly describe the position and intensity of extratropical cyclone.Thus,the research of the extratropical cyclone development is actually the mechanism analysis of vorticity.With the geostrophic wind vorticity at 1000 hPa adopted in this study,a typical extratropical cyclone with a spiral track occurred during 6-10 June 2014 is diagnosed using conventional observations and NCEP 1°×1°reanalysis data.Based on Pet-terssen’s equation,and the configuration of positive vorticity advection and divergence at 300 hPa and thermal advection at 850 hPa,this paper investigates the contributions of thermal advection in middle-low-er layer of troposphere,the vorticity advection at 500 hPa and the divergence induced by the vorticity ad-vection at 300 hPa to the development of surface cyclone.The results show that:(1 )Vorticity transferred between 2 positive vorticity zones at 300 hPa and 500 hPa.The first positive vorticity zone was the main one during cyclogenesis and development while the other became dominant in the decaying period.(2 )In the whole troposphere,the vorticity centers moved cyclonically on a curve path.During the development of the surface cyclone,the positive vorticity centers tilted rearward with height,and while weakening, they were vertically overlapped at different levels.(3)The temperature advection played a major role in cyclogenesis while positive vorticity advection at 500 hPa was the main factor in the cyclonic development. (4)Cyclone would develop when the divergence caused by positive vorticity advection at 300 hPa was loca-ted above the frontal zone at 850 hPa.关键词
温带气旋/涡度/演变/涡度方程/物理机制Key words
extratropical cyclone/vorticity/evolution/vorticity equation/physics mechanism分类
天文与地球科学引用本文复制引用
熊秋芬,张昕,陶祖钰..一次温带气旋涡度场演变特征及气旋发生发展机制分析[J].气象,2016,42(3):294-304,11.基金项目
国家自然科学基金项目（41405007）和中国气象局预报员专项（CMAYBY2015-096和CMAYBY2015-097）共同资助 （）
