东亚地区凝结加热的中期变动与西太平洋副高准双周振荡的关系

本文用ECMEF/WMO的2.5°×2.5°网格点资料对1980—1983年夏季月份的12次西太平洋副高中期进退过程进行了合成。用此合成场计算不东亚地区的凝结加热率,讨论了凝结加热的分布及其中期变动规律,以及其与西太平洋副高进退的关系。分析表明,由于热带西南季风气流涌入我国大陆引起的大陆东部地区凝结加热的变动是西太平洋副高进退的最直接动力,它是这一地区的加热场与东亚季风环流系统内部各成员之间的相互反馈过程中相互影响、相互制约的必然结果。 

THE RELATIONSHIP BETWEEN MEDIUM-RANGE FLUCTUATION OF CONDENSATION HEATING JN EAST ASIA AND QUASI-2 WEEKS OSCILLATION OF THE WEST PACIFIC SUBTROPICAL HIGH

ECMWF/WMO 2. 5°×2. 5° grid data are used to compose 12 processes of extension and return of the West Pacific Subtropical High for the summer months from 1980 through 1983. The composite fields are used to compute the condensation heating rate for East Asia and discuss its distribution and medium-range fluctuation patterns,and their relationship with the processes of extension and return of the West Pacific Subtropical High. It is shown that the fluctuation of condensation heating over the eastern Mainland China, caused by the influx of the tropical southwesterly monsoon, is the most immediate driving force for the processes of extension and return of the subtropical high, which are true reflection on mutual influence and restriction between the heating fields of the region and integral constituents of the East Asia mdnsoon circulation system in a two-way feedback.