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Response of El Niño sea surface temperature variability to greenhouse warming

Identifieur interne : 003F80 ( Main/Exploration ); précédent : 003F79; suivant : 003F81

Response of El Niño sea surface temperature variability to greenhouse warming

Auteurs : SEON TAE KIM [Australie] ; WENJU CAI [Australie, République populaire de Chine] ; Fei-Fei Jin [États-Unis] ; Agus Santoso [Australie] ; LIXIN WU [République populaire de Chine] ; Eric Guilyardi [France, Royaume-Uni] ; Soon-Il An [Corée du Sud]

Source :

RBID : Pascal:14-0251163

Descripteurs français

English descriptors

Abstract

The destructive environmental and socio-economic impacts of the El Niño/Southern Oscillation1,2 (ENSO) demand an improved understanding of how ENSO will change under future greenhouse warming. Robust projected changes in certain aspects of ENSO have been recently established3-5. However, there is as yet no consensus on the change in the magnitude of the associated sea surface temperature (SST) variability6-8, commonly used to represent ENSO amplitude1,6, despite its strong effects on marine ecosystems and rainfall worldwide1-4,9. Here we show that the response of ENSO SST amplitude is time-varying, with an increasing trend in ENSO amplitude before 2040, followed by a decreasing trend thereafter. We attribute the previous lack of consensus to an expectation that the trend in ENSO amplitude over the entire twenty-first century is unidirectional, and to unrealistic model dynamics of tropical Pacific SST variability. We examine these complex processes across 22 models in the Coupled Model Intercomparison Project phase 5 (CMIP5) database10, forced under historical and greenhouse warming conditions. The nine most realistic models identified show a strong consensus on the time-varying response and reveal that the non-unidirectional behaviour is linked to a longitudinal difference in the surface warming rate across the Indo-Pacific basin. Our results carry important implications for climate projections and climate adaptation pathways.


Affiliations:


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<div type="abstract" xml:lang="en">The destructive environmental and socio-economic impacts of the El Niño/Southern Oscillation
<sup>1,2</sup>
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<sup>3-5</sup>
. However, there is as yet no consensus on the change in the magnitude of the associated sea surface temperature (SST) variability
<sup>6-8</sup>
, commonly used to represent ENSO amplitude
<sup>1,6</sup>
, despite its strong effects on marine ecosystems and rainfall worldwide
<sup>1-4,9</sup>
. Here we show that the response of ENSO SST amplitude is time-varying, with an increasing trend in ENSO amplitude before 2040, followed by a decreasing trend thereafter. We attribute the previous lack of consensus to an expectation that the trend in ENSO amplitude over the entire twenty-first century is unidirectional, and to unrealistic model dynamics of tropical Pacific SST variability. We examine these complex processes across 22 models in the Coupled Model Intercomparison Project phase 5 (CMIP5) database
<sup>10</sup>
, forced under historical and greenhouse warming conditions. The nine most realistic models identified show a strong consensus on the time-varying response and reveal that the non-unidirectional behaviour is linked to a longitudinal difference in the surface warming rate across the Indo-Pacific basin. Our results carry important implications for climate projections and climate adaptation pathways.</div>
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