Decadal northward shift of the Meiyu belt and the possible cause

被引:111
作者
Si Dong [1 ,2 ]
Ding YiHui [2 ]
Liu YanJu [2 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Coll Atmospher Sci, Nanjing 210044, Peoples R China
[2] Natl Climate Ctr, Beijing 100081, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2009年 / 54卷 / 24期
关键词
Meiyu; widening of the subtropics; northward shift of the Meiyu belt; SUMMER MONSOON;
D O I
10.1007/s11434-009-0385-y
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The feature of the decadal movement of the Meiyu belt and their association with East Asia atmospheric circulation for the period of 1979-2007 is examined in this study. It is shown that the Meiyu belt of China has a decadal shift in the late 1990s. There is a remarkable difference between the periods before and after 1999, with the Meiyu belt mainly located to the south of the Yangtze River valley before 1999, but afterward mainly located in the Huaihe River valley. At the same time, a distinctive tropospheric warming and stratospheric cooling trend is found in the mid-latitudes of East Asia, which causes the upper tropospheric pressure surfaces upward bulging and the tropoause elevated in the subtropics and associated widening of the subtropical area over East Asia. Accompanying the subtropics widening, the subtropical westerly jet over East Asia shifts northward and the East Asia tropical Hadley circulation expands poleward, which results in the northward shift of the Meiyu belt.
引用
收藏
页码:4742 / 4748
页数:7
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