Quantifying relative contributions of three tropical oceans to the Western North Pacific anomalous anticyclone

Zhiyuan Lu, Lu Dong, F. Song, Bo Wu, Shuyan Wu, Chunzai Wang
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Abstract

The western North Pacific anomalous anticyclone (WNPAC) often exists during the mature and decaying phases of El Niño, significantly affecting the East Asian summer monsoon. Previous studies have revealed the importance of the Indian, Pacific, and Atlantic Oceans in generating and maintaining the WNPAC. However, a quantitative comparison of the contributions from these three oceans is still lacking. This study uses pacemaker experiments with a state-of-the-art model to quantify the relative contributions of the three tropical oceans to the interannual WNPAC variability. We find that the Pacific accounts for over 50% of the interannual variance in boreal winter and the following spring, while the roles of the Atlantic and Indian Oceans become more pronounced in spring. In summer, all three oceans contribute significantly and equally. The Indian Ocean SST is influenced by remote forcing from the Pacific Ocean, while the Atlantic Ocean operates more independently, with no evident effect from other oceans.
量化三个热带海洋对北太平洋西部异常反气旋的相对贡献
北太平洋西部异常反气旋(WNPAC)经常存在于厄尔尼诺现象的成熟期和衰减期,对东亚夏季季风产生重大影响。以往的研究表明,印度洋、太平洋和大西洋在产生和维持 WNPAC 方面起着重要作用。然而,目前仍缺乏对这三个大洋的贡献进行定量比较。本研究利用最先进的模式进行起搏器实验,量化三个热带海洋对 WNPAC 年际变率的相对贡献。我们发现,在北方冬季和次年春季,太平洋对年际变化的贡献率超过 50%,而大西洋和印度洋在春季的作用则更加明显。在夏季,三大洋的作用相同且都很大。印度洋的海温受太平洋的远距离强迫影响,而大西洋的海温则更加独立,没有受到其他大洋的明显影响。
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