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ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile
Transient mesoscale oceanic eddies in Eastern Boundary Upwelling Systems are thought to strongly affect key regional scale processes such as ocean heat transport, coastal upwelling and productivity. Understanding how these can be modulated at low-frequency is thus critical to infer their role in the...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7578051/ https://www.ncbi.nlm.nih.gov/pubmed/33087768 http://dx.doi.org/10.1038/s41598-020-74762-x |
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author | Conejero, Carlos Dewitte, Boris Garçon, Véronique Sudre, Joël Montes, Ivonne |
author_facet | Conejero, Carlos Dewitte, Boris Garçon, Véronique Sudre, Joël Montes, Ivonne |
author_sort | Conejero, Carlos |
collection | PubMed |
description | Transient mesoscale oceanic eddies in Eastern Boundary Upwelling Systems are thought to strongly affect key regional scale processes such as ocean heat transport, coastal upwelling and productivity. Understanding how these can be modulated at low-frequency is thus critical to infer their role in the climate system. Here we use 26 years of satellite altimeter data and regional oceanic modeling to investigate the modulation of eddy kinetic energy (EKE) off Peru and Chile by ENSO, the main mode of natural variability in the tropical Pacific. We show that EKE tends to increase during strong Eastern Pacific (EP) El Niño events along the Peruvian coast up to northern Chile and decreases off central Chile, while it is hardly changed during Central Pacific El Niño and La Niña events. However the magnitude of the EKE changes during strong EP El Niño events is not proportional to their strength, with in particular the 1972/1973 El Niño event standing out as an extreme event in terms of EKE increase off Peru reaching an amplitude three times as large as that during the 1997/1998 El Niño event, and the 2015/2016 El Niño having instead a weak impact on EKE. This produces decadal changes in EKE, with a similar pattern than that of strong EP El Niño events, resulting in a significant negative (positive) long-term trend off Peru (central Chile). |
format | Online Article Text |
id | pubmed-7578051 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-75780512020-10-23 ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile Conejero, Carlos Dewitte, Boris Garçon, Véronique Sudre, Joël Montes, Ivonne Sci Rep Article Transient mesoscale oceanic eddies in Eastern Boundary Upwelling Systems are thought to strongly affect key regional scale processes such as ocean heat transport, coastal upwelling and productivity. Understanding how these can be modulated at low-frequency is thus critical to infer their role in the climate system. Here we use 26 years of satellite altimeter data and regional oceanic modeling to investigate the modulation of eddy kinetic energy (EKE) off Peru and Chile by ENSO, the main mode of natural variability in the tropical Pacific. We show that EKE tends to increase during strong Eastern Pacific (EP) El Niño events along the Peruvian coast up to northern Chile and decreases off central Chile, while it is hardly changed during Central Pacific El Niño and La Niña events. However the magnitude of the EKE changes during strong EP El Niño events is not proportional to their strength, with in particular the 1972/1973 El Niño event standing out as an extreme event in terms of EKE increase off Peru reaching an amplitude three times as large as that during the 1997/1998 El Niño event, and the 2015/2016 El Niño having instead a weak impact on EKE. This produces decadal changes in EKE, with a similar pattern than that of strong EP El Niño events, resulting in a significant negative (positive) long-term trend off Peru (central Chile). Nature Publishing Group UK 2020-10-21 /pmc/articles/PMC7578051/ /pubmed/33087768 http://dx.doi.org/10.1038/s41598-020-74762-x Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Conejero, Carlos Dewitte, Boris Garçon, Véronique Sudre, Joël Montes, Ivonne ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title | ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title_full | ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title_fullStr | ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title_full_unstemmed | ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title_short | ENSO diversity driving low-frequency change in mesoscale activity off Peru and Chile |
title_sort | enso diversity driving low-frequency change in mesoscale activity off peru and chile |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7578051/ https://www.ncbi.nlm.nih.gov/pubmed/33087768 http://dx.doi.org/10.1038/s41598-020-74762-x |
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