Pacific and Atlantic controls of the relationship between Mainland Southeast Asia and East China interannual precipitation variability
Pacific and Atlantic controls of the relationship between Mainland Southeast Asia and East China interannual precipitation variability
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DOI：
10.1007/s00382-020-05227-0
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发表时间：
2020-04
期刊：
影响因子：
4.6
通讯作者：
Jessica K. Wang;Jin‐Yi Yu;K. Johnson
中科院分区：
文献类型：
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作者：
Jessica K. Wang;Jin‐Yi Yu;K. Johnson
亚洲季风区高度依赖北方夏季降雨，每年直接影响社会经济稳定和数十亿人的福祉。中国东部的降水变率已被广泛研究，并以经向三极和偶极降水结构为特征。相比之下，很少有研究关注东南亚大陆（MSEA）的降水变化以及与中国东部降水变化的可能关系。在这里，我们使用经验正交函数 (EOF) 分析重点关注 1983 年至 2017 年期间 MSEA 的年际降水变化如何与三极或偶极模式相关。第一个EOF显示了华东夏季降水的经向三极格局以及MSEA与华南降水的同相关系。相比之下，第二个EOF显示华东降水呈经向偶极格局，并且MSEA与华南降水之间存在异相关系。我们表明，第一个 EOF 模式是对厄尔尼诺南方涛动（ENSO）的延迟降水响应，而第二个 EOF 模式是对北大西洋涛动（NAO）远程影响的同时降水响应。因此，东南亚和华南降水的同相或异相变化可用于衡量当地太平洋和偏远大西洋对亚洲季风气候影响的相对重要性。
The Asian monsoon region is highly dependent on boreal summer rainfall, which directly impacts the socio-economic stability and welfare of billions of people each year. Precipitation variability over East China has been extensively studied and is known to be characterized by meridional tripole and dipole precipitation structures. In contrast, few studies have focused on precipitation variability over Mainland Southeast Asia (MSEA) and the possible relationship with the variability over East China. Here we focus on how interannual precipitation variability across MSEA during 1983–2017 may be associated with the tripole or dipole patterns using an empirical orthogonal function (EOF) analysis. The first EOF shows a meridional tripole pattern in East China summer precipitation and an in-phase relationship between MSEA and South China precipitation. In contrast, the second EOF shows a meridional dipole pattern in East China precipitation and an out-of-phase relationship between MSEA and South China precipitation. We show that the first EOF mode is a delayed precipitation response to the El Niño-Southern Oscillation (ENSO), while the second EOF mode is a simultaneous precipitation response to the remote influence of the North Atlantic Oscillation (NAO). Therefore, the in-phase or out-of-phase variations in precipitation between MSEA and South China may be used to gauge the relative importance of local Pacific and remote Atlantic influences on Asian monsoon climate.