7月份两种东亚阻塞形势对中国主要雨带位置的不同影响

DIFFERENT INFLUENCE OF TWO EAST ASIAN BLOCKING SITUATIONS IN JULY ON RAIN BELT LOCATION IN CHINA

中文关键词:  夏季阻塞高压  中国雨带  类型分析

英文关键词:Summer blocking high,Principal rain belt in China,Patter nanalysis

中文摘要:

      根据长期的业务实践,把7月份东亚阻塞形势分为副热带高压偏西型(W型)和副热带高压偏东型(E型)两类阻塞形势,对比两种阻塞形势下中国主要雨带位置的差别后发现,W型主要雨带在长江流域,1951年以来较严重的长江大水是此类阻塞形势造成的;E型主要雨带位于江南至华南地区,长江流域洪涝较轻。不仅两种阻塞形势的7月份环流有重大差别,其前期秋、冬、春季海洋、大气和天气气候特点也大不相同。

英文摘要:

      A ccording to the weather pracfice,the location of main rain belt in China is dependent on combination of East Asian Blocking High(EABH) and long it udinal place of westterminal point of West Pacific Subtropical Ridge(WPSR) when EABH appears in July.Taking longit udinal place 120°E as the westter minal point of WPSR,Wpattern could be defined when it reaches west side of 120°E,otherwise Epattern could be defined.Principal rain belt was situated ar ound Yangtze River when Wpattern was est ablished,it leads to severe flood saround Yangtze River since 1951,and principal rain belt was situated in south side of Yangtze River when Epattern was established.Not only there are significant differences between Wand Epatterns about generalcir culation in July but also the two preperiodsignals are greatly different aboutsea,at mospheric circulation,weather and climate.