Oceanic versus terrestrial origin of El Niño Southern Oscillation–associated continental precipitation anomalies,Annals of the New York Academy of Sciences

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Oceanic versus terrestrial origin of El Niño Southern Oscillation–associated continental precipitation anomalies
Annals of the New York Academy of Sciences ( IF 4.1 ) Pub Date : 2021-07-16 , DOI: 10.1111/nyas.14665
Rogert Sorí _{1,

2} , Raquel Nieto ₁ , Margarida L R Liberato _{2,

3} , Luis Gimeno ₁

Affiliation

Precipitation is significantly influenced by the El Niño Southern Oscillation (ENSO), which is considered to be the most important factor that brings about climate variability. In this study, the asymmetry of the origin of continental precipitation anomalies during El Niño and La Niña events was investigated. An already validated Lagrangian approach was used to determine the proportion of the total Lagrangian precipitation that is of oceanic and terrestrial origin. Further, the role of these components of the Lagrangian precipitation in regions with significant precipitation anomalies during the ENSO was investigated. A two-phase asymmetric behavior of precipitation, particularly in tropical regions, was obtained. For some of these regions, precipitation anomalies based on other datasets were also calculated to confirm the observed changes, and for these regions, it was observed that in all cases, the calculated anomaly of Lagrangian precipitation agreed with the precipitation change. The percentage of precipitation of oceanic origin was higher in most of these regions. However, it was observed that an increase in the percentage of precipitation of oceanic origin did not bring about a general increase in precipitation for all the regions, revealing the importance of precipitation of terrestrial origin during both phases of the ENSO.

中文翻译：

厄尔尼诺南方涛动相关大陆降水异常的海洋与陆地起源

降水受厄尔尼诺南方涛动 (ENSO) 的显着影响，被认为是导致气候变率的最重要因素。本研究探讨了厄尔尼诺和拉尼娜事件期间大陆降水异常成因的不对称性。已经验证的拉格朗日方法用于确定海洋和陆地来源的拉格朗日总降水量的比例。此外，研究了 ENSO 期间拉格朗日降水的这些成分在具有显着降水异常的地区的作用。获得了降水的两相不对称行为，特别是在热带地区。对于其中一些地区，还计算了基于其他数据集的降水异常，以确认观测到的变化，对于这些区域，观察到在所有情况下，计算的拉格朗日降水异常与降水变化一致。在这些地区的大部分地区，海洋降水的百分比较高。然而，观察到海洋源降水百分比的增加并没有导致所有区域的降水普遍增加，揭示了ENSO两个阶段陆源降水的重要性。

更新日期：2021-07-16

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