Impact of the Indian Ocean SST basin mode on the Asian summer monsoon
Impact of the Indian Ocean SST basin mode on the Asian summer monsoon
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DOI：
10.1029/2006gl028571
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发表时间：
2006-12
影响因子：
5.2
通讯作者：
Jianling Yang;Qinyu Liu;S. Xie;Zhengyu Liu;Lixin Wu
中科院分区：
文献类型：
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作者：
Jianling Yang;Qinyu Liu;S. Xie;Zhengyu Liu;Lixin Wu
在厄尔尼诺事件之后，热带印度洋发生了全流域变暖，在北半球的冬季末和早春达到顶峰，并持续到北半球的夏季。我们的观测分析表明，印度洋变暖在夏季印度洋-西太平洋地区引起了强烈的气候异常，在热带东太平洋海面温度恢复正常后延长了厄尔尼诺的影响。由于印度洋暖化，盆地大部分地区的降水增加，迫使对流层上层出现松野-吉尔型，南亚高压加强。接近地面的西南季候风在阿拉伯海增强，在南海和菲律宾海减弱。副热带西北太平洋上空形成异常反气旋环流，并与降水负距平相伴。所有这些异常模式都在一个耦合模式模拟中重现，该模式初始化为热带印度洋混合层的变暖，表明印度洋变暖不仅仅是对厄尔尼诺的被动响应，而且对印西太平洋地区夏季气候变率很重要。季节性预测的影响进行了讨论。
Following an El Niño event, a basin‐wide warming takes place over the tropical Indian Ocean, peaks in late boreal winter and early spring, and persists through boreal summer. Our observational analysis suggests that this Indian Ocean warming induces robust climatic anomalies in the summer Indo‐West Pacific region, prolonging the El Niño's influence after tropical East Pacific sea surface temperature has returned to normal. In response to the Indian Ocean warming, precipitation increases over most of the basin, forcing a Matsuno‐Gill pattern in the upper troposphere with a strengthened South Asian high. Near the ground, the southwest monsoon intensifies over the Arabian Sea and weakens over the South China and Philippine Seas. An anomalous anticyclonic circulation forms over the subtropical Northwest Pacific, collocated with negative precipitation anomalies. All these anomaly patterns are reproduced in a coupled model simulation initialized with a warming in the tropical Indian Ocean mixed layer, indicating that the Indian Ocean warming is not just a passive response to El Niño but important for summer climate variability in the Indo‐West Pacific region. The implications for seasonal prediction are discussed.