东亚夏季气旋活动的气候学特征及其对我国降水的影响  

Climatological Characteristics of Cyclone Activity in East Asia in Summer and its Effects on Rainfall in China

作　　者：王艳玲[1] 郭品文[2] 

机构地区：[1]江苏海事职业技术学院,江苏南京211170 [2]南京信息工程大学大气科学学院,江苏南京210044

出　　处：《安徽农业科学》2010年第34期19591-19594,共4页Journal of Anhui Agricultural Sciences

摘　　要：对东亚夏季气旋活动的时空变化特征以及夏季气旋活动频数与500 hPa大气环流背景场、我国降水的关系进行了研究。结果表明,夏季气旋活动主要集中在3个区域,其中25°N以北气旋活动频数在70年代中期前持续偏多,70年代中期后持续偏少;气旋活动频数的年代际变化与500 hPa大气环流的异常密切相关。70年代中期前东亚地区中高纬度呈现明显的负距平带,盛行经向环流,气旋性活动增加;而70年代中期后的大气环流形势相反。我国山东半岛夏季降水也具有明显的年代际差异,经历了多雨期和少雨期2个阶段,且山东半岛的多(少)雨期与25°N以北气旋活动频数的偏多(少)期相吻合。The spatial and temporal variations of cyclone activity in summer in East Asia have been studied,as well as the relationship between cyclone activity frequency,atmospheric circulation background field at 500 hPa and rainfall in China.The results showed that cyclone activity in summer was mainly distributed in three regions,and cyclone activity frequencty in the north of 25° N before the middle of 1970s was continuously higher than that after the middle of 1970s.The decadal variation of cyclone activity frequency was closely related to the anomaly of atmospheric circulation at 500 hPa.There was obvious negative anomaly in middle and high latitude of East Asia before the middle of 1970s,prevailing meridional circulation,with the increase of cyclone activity.However,the atmospheric circulation situation was reverse after the middle of 1970s.Summer rainfall in Shandong Peninsula had significant decadal variability,experiencing wet and dry season,and wet（or dry） season was fit to the period of higher（or lower） cyclone activity frequency in the north of 25° N.

关 键 词：夏季气旋 活动频数 气候学特征 降水 

分 类 号：P447[天文地球—大气科学及气象学]