Upstream Subtropical Signals Preceding the Asian Summer Monsoon Circulation
Upstream Subtropical Signals Preceding the Asian Summer Monsoon Circulation
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DOI：
10.1175/jcli3192.1
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发表时间：
2004-11
影响因子：
4.9
通讯作者：
Song Yang;K. Lau;S. Yoo;J. Kinter;K. Miyakoda;Chang‐Hoi Ho
中科院分区：
文献类型：
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作者：
Song Yang;K. Lau;S. Yoo;J. Kinter;K. Miyakoda;Chang‐Hoi Ho
在这项研究中，作者解决了几个问题，有关的前期信号的大规模亚洲夏季风，早期确定的韦伯斯特和杨。特别是，他们重新审视了季风之前副热带对流层上层西风带的变化，描绘了季风先行信号的详细结构，并研究了从信号到季风的物理过程。他们还探讨了这些信号与各种大尺度气候现象的遥相关，并强调了信号相对于青藏高原和季风的上游位置的重要性。在亚洲夏季风强（弱）之前，前冬、春季亚洲副热带200毫巴西风带弱（强）。这些信号的一个重要特征是中东急流的变化，其变化与北极涛动，北大西洋涛动，厄尔尼诺。
In this study, the authors address several issues with respect to the antecedent signals of the large-scale Asian summer monsoon that were earlier identified by Webster and Yang. In particular, they revisit the changes in the subtropical upper-tropospheric westerlies preceding the monsoon, depict the detailed structure of the monsoon’s antecedent signals, and investigate the physical processes from the signals to the monsoon. They also explore the teleconnection of these signals to various large-scale climate phenomena and emphasize the importance of the upstream location of the signals relative to the Tibetan Plateau and the monsoon. Before a strong (weak) Asian summer monsoon, the 200-mb westerlies over subtropical Asia are weak (strong) during the previous winter and spring. A significant feature of these signals is represented by the variability of the Middle East jet stream whose changes are linked to the Arctic Oscillation, North Atlantic Oscillation, El .