气象科学2017，Vol.37Issue(4)：458-465,8.DOI:10.3969/2016jms.0048
陆面热力异常与东亚夏季中纬度气旋年代际变化的联系
Relationship between land surface thermal anomaly and the interdecadal variation of extra-tropical cyclone activity during summer over East Asia
摘要
Abstract
Based on the ERA-interim reanalysis data from 1979 to 2013,the interdecadal variations of the extra-tropical cyclones and land surface thermal anomaly and their possible relationship are investigated with statistical methods.Results show that there exists a distinct cyclogenesis area in the mid-latitude region of East Asia,and the frequency of cyclogenesis over this area exhibits significant interdecadal changes.Before 1990,the frequency of cyclogenesis was relatively high;however,from the 1990s to the present,it is relatively weak.Meanwhile,the land surface thermal anomaly shows a decadal increasing trend.Further analysis suggests that there is a close linkage between the decadal warming of the land surface in the mid-latitude of East Asia and the decadal weakening of the cyclone activity.Due to the heterogeneity of the land surface warming,it is a key region in the north of that has a significant effect on the cyclone activity over the cyclogenesis area.The decadal warming of the key region tends to decrease the meridional gradient of the surface soil temperature over the cyclongenesis source region,leading to the weakening atmospheric baroclinicity,and the decreasing frequency of the cyclogenesis.关键词
温带气旋/陆面热力异常/大气斜压性/年代际变化Key words
Extra-tropical cyclone/Land surface thermal anomaly/Atmospheric baroclinicity/Interdecadal variation分类
天文与地球科学引用本文复制引用
张莞昕,陈海山..陆面热力异常与东亚夏季中纬度气旋年代际变化的联系[J].气象科学,2017,37(4):458-465,8.基金项目
公益性行业(气象)科研专项(GYHY201206017) （气象）
国家自然科学基金资助项目(41230422) （41230422）
江苏省杰出青年基金资助项目(BK20130047) （BK20130047）
新世纪优秀人才支持计划 （）
