The impact of the AMO on multidecadal ENSO variability
The impact of the AMO on multidecadal ENSO variability
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DOI：
10.1002/2017gl072524
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发表时间：
2017-04
影响因子：
5.2
通讯作者：
Aaron Levine;M. Mcphaden;D. Frierson
中科院分区：
文献类型：
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作者：
Aaron Levine;M. Mcphaden;D. Frierson
厄尔尼诺 - 南方涛动（ENSO）变率的数十年尺度的转变已被观测到，但尚不清楚这种变率仅仅是ENSO循环中的随机变化，还是由其他气候变率模式所驱动。在此我们展示了大西洋对ENSO数十年变率的强烈影响。大西洋多年代际振荡（AMO）是大西洋海表温度（SST）数十年变率的主导模式。已知与AMO相关的热带大西洋海表温度的变化会迫使热带太平洋的沃克环流发生变化。通过概念模型和耦合模型实验，我们表明沃克环流的这些变化在年际和数十年时间尺度上改变了ENSO的稳定性，从而导致了一种独特的数十年ENSO变率模式，我们在观测和海洋再分析中发现了这种模式。
Multidecadal shifts in El Niño–Southern Oscillation (ENSO) variability have been observed, but it is unclear if this variability is just a random variation in the ENSO cycle or whether it is forced by other modes of climate variability. Here we show a strong influence of the Atlantic on the multidecadal variability of ENSO. The Atlantic Multidecadal Oscillation (AMO) is the dominant mode of multidecadal sea surface temperature (SST) variability in the Atlantic Ocean. Changes in AMO‐related tropical Atlantic SSTs are known to force changes in the Walker circulation in the tropical Pacific Ocean. Using conceptual and coupled model experiments, we show that these changes to the Walker circulation modify ENSO stability on both annual and multidecadal time scales leading to a distinctive pattern of multidecadal ENSO variability that we find in observations and ocean reanalyses.