Weakening of Winter North Atlantic Oscillation Signal in Spring Precipitation over Southern China

被引:20
|
作者
Zhou Bo-Tao [1 ,2 ]
机构
[1] Natl Climate Ctr, Beijing 100081, Peoples R China
[2] Chinese Acad Sci, Nansen Zhu Int Res Ctr, Inst Atmospher Phys, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
North Atlantic Oscillation; precipitation over southern China; interdecadal change;
D O I
10.3878/j.issn.1674-2834.13.0010
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
In this study, the relationship between the North Atlantic Oscillation (NAO) in winter (DecemberFebruary) and the precipitation over southern China (SCP) in the following spring (March-May) was investigated. Results showed an interdecadal change, from strong to weak connection, in their connection. Before the early 1980s, they were highly correlated, with a strong (weak) winter NAO followed by an increased (decreased) spring SCP. However, after the early 1980s, their relationship was weakened significantly. This unstable relationship may be linked to the climatological change of East Asian jet. Before the early 1980s, the wave train along the Asian jet propagated the NAO signal eastward to East Asia and affected local upper-tropospheric atmospheric circulation. A strong NAO in winter led to an anomalous anticyclonic circulation at the south side of 30. N in East Asia in spring, resulting in an increase of SCP. In contrast, after the early 1980s, the wave train pattern along the Asian jet extended eastward due to strengthening of the climatological East Asian jet. Correspondingly, the NAO-related East Asian atmospheric circulations in the upper troposphere shifted eastward, thereby weakening the linkage between the spring SCP and the winter NAO.
引用
收藏
页码:248 / 252
页数:5
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