摘要
在位涡框架下,利用位涡反演方法,对2003年夏季梅雨期间沿梅雨锋东移的一次弱江淮气旋的形成和维持过程进行了分析,并与强气旋的结果进行了对比。结果表明:对流层中高层的扰动在低层气旋中心位势高度降低或地面低压减压中起主要作用,而中低层的扰动起反作用,低层热力异常呈现一个弱的周期性作用。但在强江淮气旋的形成和发展过程中,中高层强迫对低层气旋发展期间的加深或地面低压的减压几乎没有贡献,中低层的非绝热加热是低层气旋加深或地面低压下降的主要贡献者。
In the potential vorticity（PV） frame work,the formation and maintenance processes of a weak cyclone along the Meiyu front moving to east during the Meiyu period of 2003 are analyzed using the PV inversion technique,and its result is also compared with that of a strong cyclone.Results show that the perturbations in the middle-and upper-tropospheres play an important role in the geopotential height descent of lower-level cyclone center or reduction of surface low pressure,but these in the middle-and lower-tropospheres have an negative effection and the bottom heat anomaly plays a weak periodic effection on them.However,in the formation and development processes of a strong cyclone,the forcing from the middle-and upper-tropospheres has almost no contribution to the strengthening of lower-level cyclone or reduction of surface low pressure,on the contrary,the diabatic heating in the middle-and lower-troposphere is the main contributor to them.
出处
《高原气象》
CSCD
北大核心
2010年第2期309-320,共12页
Plateau Meteorology
基金
灾害天气国家重点实验室基金项目(2006LASW06)资助
关键词
梅雨
江淮气旋
位涡扰动
位涡反演
Meiyu
Cyclone over Yangtze-Huaihe River Valleys
PV perturbation
PV inversion
