A recent shift in the monsoon centers associated with the tropospheric biennial oscillation
A recent shift in the monsoon centers associated with the tropospheric biennial oscillation
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最近季风中心的变化与对流层两年期振荡有关
DOI：
10.1175/jcli-d-17-0349.1
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发表时间：
2018
影响因子：
4.9
通讯作者：
Jin-Yi Yu
中科院分区：
文献类型：
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作者：
Wang Lei;Jin-Yi Yu
对流层两年期振荡（TBO）通常被认为涉及印度和澳大利亚夏季风之间的转换以及这两个季风与下伏印度洋-太平洋之间的相互作用。在这里，它表明，自20世纪90年代初，TBO已经演变成主要涉及西北太平洋（WNP）和澳大利亚季风之间的过渡。在这个框架下，近几十年来，西北太平洋季风取代印度季风成为活跃的北方半球TBO季风中心。这种变化是由太平洋-大西洋耦合增强和热带大西洋对印度季风和WNP季风影响增强引起的。大西洋的影响减弱了太平洋对印度夏季风的影响（导致其变率降低），但放大了太平洋对WNP夏季风的影响（导致其变率增加）。这些结果表明，太平洋-大西洋的相互作用已成为更重要的TBO动力学在最近几十年。
The tropospheric biennial oscillation (TBO) is conventionally considered to involve transitions between the Indian and Australian summer monsoons and the interactions between these two monsoons and the underlying Indo-Pacific Oceans. Here it is shown that, since the early 1990s, the TBO has evolved to mainly involve the transitions between the western North Pacific (WNP) and Australian monsoons. In this framework, the WNP monsoon replaces the Indian monsoon as the active Northern Hemisphere TBO monsoon center during recent decades. This change is found to be caused by stronger Pacific–Atlantic coupling and an increased influence of the tropical Atlantic Ocean on the Indian and WNP monsoons. The increased Atlantic Ocean influence damps the Pacific Ocean influence on the Indian summer monsoon (leading to a decrease in its variability) but amplifies the Pacific Ocean influence on the WNP summer monsoon (leading to an increase in its variability). These results suggest that the Pacific–Atlantic interactions have become more important to the TBO dynamics during recent decades.