On the Spatiotemporal Diversity of Atlantic Niño and Associated Rainfall Variability Over West Africa and South America
On the Spatiotemporal Diversity of Atlantic Niño and Associated Rainfall Variability Over West Africa and South America
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大西洋尼诺现象的时空多样性及西非和南美洲的相关降雨变化
DOI：
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发表时间：
2020
影响因子：
5.2
通讯作者：
J. Pelegrí
中科院分区：
文献类型：
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作者：
I. Vallès‐Casanova;Sang‐Ki Lee;G. Foltz;J. Pelegrí
大西洋厄尔尼诺事件期间赤道大西洋海表温度异常的时空演变及其对周围大陆的气候影响是极其多样的。在这项研究中，我们为1948-2019年期间观测到的每个大西洋厄尔尼诺事件构建了赤道大西洋SSTA的经度-时间地图，并进行了时空经验正交函数分析，以确定四种最常见的大西洋厄尔尼诺品种。前两个对比消散的时间（早期终止vs.持续性），另外两个对比发作的时间（早期发作vs.晚期发作）。与爆发和消散时间的差异基本一致，这四个品种在西非和南美洲的降雨响应中表现出显着差异。大多数品种的发病机制，涉及预处理在北半球春季的大西洋北半球模式或太平洋厄尔尼诺，而晚发病的变化没有明确的外部强迫源。
The spatiotemporal evolutions of equatorial Atlantic sea surface temperature anomalies (SSTAs) during Atlantic Niño events and the associated climate impacts on the surrounding continents are extremely diverse. In this study, we construct longitude‐time maps of equatorial Atlantic SSTAs for each observed Atlantic Niño event during 1948–2019 and perform a spatiotemporal empirical orthogonal function analysis to identify the four most frequently recurring Atlantic Niño varieties. The first two contrast the timing of dissipation (early terminating vs. persistent) and the other two the timing of onset (early onset vs. late onset). Largely consistent with the differences in the timings of onset and dissipation, these four varieties display remarkable differences in rainfall response over West Africa and South America. Most of the varieties are subject to onset mechanisms that involve preconditioning in boreal spring by either the Atlantic meridional mode or Pacific El Niño, while for the late onset variability there is no clear source of external forcing.
影响因子：
64.8
作者：
Brandt;A. Funk;V. Hormann;M. Dengler;R. Greatbatch;J. Toole
通讯作者：
J. Toole