Distinct onset mechanisms of two subtypes of CP El Niño and their Changes in future warming
Distinct onset mechanisms of two subtypes of CP El Niño and their Changes in future warming
复制标题
中部型厄尔尼诺两种亚型的独特发病机制及其对未来变暖的变化
DOI：
10.1029/2021gl093707
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发表时间：
2021
影响因子：
5.2
通讯作者：
Sheng Chen
中科院分区：
文献类型：
--
作者：
Mengyan Chen;Jin-Yi Yu;Xin Wang;Sheng Chen
本文分析了中太平洋厄尔尼诺的两个亚型，表明它们在印度洋-太平洋具有不同的海表温度演变模式，不同的生成机制，对全球变暖的响应也不同。CP-I型在热带西太平洋由弱于正常的澳大利亚冬季风（AM）通过次表层温跃层机制触发，并伴随着显著的印度洋变暖。CP‐II型通过太平洋经向模态（PMM）通过地面耦合机制在副热带北太平洋爆发，并伴随着印度洋的弱变暖异常。两个气候模式的预测表明，由于PMM和AM活动的变化，未来CP-II型可能比CP-I型更频繁地发生，这将削弱厄尔尼诺对印度洋的影响，并导致更多的厄尔尼诺事件从北美海岸开始。
This study analyzes two subtypes of Central Pacific (CP) El Niño and shows that they possess different sea surface temperature evolution patterns in the Indo‐Pacific Oceans, distinct generation mechanisms, and can respond differently to global warming. The CP‐I type is triggered in the tropical western Pacific by the weaker‐than‐normal Australian winter monsoon (AM) through a subsurface thermocline mechanism and is accompanied by significant Indian Ocean warming. The CP‐II type onsets in the subtropical North Pacific by the Pacific Meridional Mode (PMM) through a surface coupling mechanism and is accompanied by weak warming anomalies in the Indian Ocean. Two climate models projections indicate that the CP‐II type may occur more frequently than the CP‐I type in the future due to changes in PMM and AM activities, which should weaken El Niño influences on the Indian Ocean and result in more El Niño events that onset from the North American coast.