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Meridional Migration of ENSO Impact on Tropical Atlantic Precipitation Controlled by the Seasonal Cycle
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2021-12-03 , DOI: 10.1029/2021gl096365
Feng Jiang 1 , Wenjun Zhang 1 , Fei‐Fei Jin 2 , Malte F. Stuecker 3
Affiliation  

Previous studies suggest that the El Niño–Southern Oscillation (ENSO) impact on tropical Atlantic climate variability shows strong seasonal preference, manifesting itself primarily in the decaying boreal spring season. However, here we show that a robust ENSO signal in tropical Atlantic precipitation anomalies can be detected throughout ENSO’s whole lifecycle. We find that the ENSO impact on the tropical Atlantic precipitation migrates meridionally, following the seasonal migration of the Atlantic Intertropical Convergence Zone (ITCZ). Taking into account the modulation of the local seasonal cycle, the full spatiotemporal characteristics of ENSO’s impact on tropical Atlantic precipitation are uncovered. Furthermore, we demonstrate that climate models can simulate the modulation of ENSO-related precipitation over the tropical Atlantic by the local seasonal cycle despite the substantial mean state model bias in the Atlantic ITCZ. This extended perspective on ENSO’s impact on tropical Atlantic climate variability enhances prospects for skillful year-round regional climate prediction.

中文翻译:

季节性周期控制下ENSO对热带大西洋降水影响的经向迁移

先前的研究表明,厄尔尼诺-南方涛动 (ENSO) 对热带大西洋气候变化的影响显示出强烈的季节性偏好,主要表现在衰败的北方春季。然而,在这里我们表明,在 ENSO 的整个生命周期中都可以检测到热带大西洋降水异常中的稳健 ENSO 信号。我们发现 ENSO 对热带大西洋降水的影响随着大西洋热带辐合带 (ITCZ) 的季节性迁移而沿经向迁移。考虑到局部季节周期的调制,ENSO 对热带大西洋降水影响的完整时空特征被揭示。此外,我们证明,尽管大西洋 ITCZ 存在大量平均状态模型偏差,但气候模型可以模拟当地季节周期对热带大西洋 ENSO 相关降水的调制。这种对 ENSO 对热带大西洋气候变率影响的扩展观点增强了熟练的全年区域气候预测的前景。
更新日期:2021-12-14
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