Long-Term Variations of Broad-Scale Asian Summer Monsoon Circulation and Possible Causes
Long-Term Variations of Broad-Scale Asian Summer Monsoon Circulation and Possible Causes
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DOI：
10.1175/jcli-d-12-00691.1
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发表时间：
2013-10
影响因子：
4.9
通讯作者：
Z. Zuo;Song Yang;Renhe Zhang;Pinping Jiang;Li Zhang;Fang Wang
中科院分区：
文献类型：
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作者：
Z. Zuo;Song Yang;Renhe Zhang;Pinping Jiang;Li Zhang;Fang Wang
广泛应用的Webster-Yang指数（WYI）是亚洲夏季风（ASM）大尺度动力学特征的一个度量指标，它经历了强烈的年际和年代际变化，并有减小的趋势，1972年有明显的变化。1972年以前，WYI的年际变化中等，正位相频繁; 1972-98年期间，WYI的年际变化较强;在热带/副热带的垂直切变东风异常和欧亚大陆（Eu）的异常垂直切变反气旋环流是减少WYI的背景，与孟加拉湾和苏门答腊岛周围的夏季降水减少。在年代际时间尺度上，负（正）的大西洋年代际振荡（AMO）通过北大西洋振荡表现为欧亚对流层温度（TT）的变冷（变暖）。全球变暖操纵着全球变暖的增长趋势和年际变化。
AbstractThe widely applied Webster–Yang index (WYI), which measures the broad-scale dynamical features of the Asian summer monsoon (ASM), has experienced robust interannual and interdecadal variations and a decreasing tendency, with apparent shifts in 1972. The WYI exhibits moderate variability and frequent positive phases before 1972, intensive interannual variability during 1972–98, and an obvious decreasing tendency and mainly negative phase afterward. The vertical shear easterly anomalies over the tropics/subtropics and the anomalous vertical shear anticyclonic circulation over Eurasia (Eu) are the background for the decreasing WYI, associated with reduced summer precipitation around the Bay of Bengal and Sumatra. On interdecadal time scales, the negative (positive) Atlantic multidecadal oscillation (AMO) is characterized by cooling (warming) in Eurasian tropospheric temperature (TT) via the North Atlantic Oscillation. Global warming manipulates the increasing tendency and the interannual variability ...