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Future high-resolution El Niño/Southern Oscillation dynamics

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Title
Future high-resolution El Niño/Southern Oscillation dynamics
Author(s)
Christian Wengel; Sun-Seon Lee; Stuecker, Malte F.; Axel Timmermann; Jung-Eun Chu; Schloesser, Fabian
Publication Date
2021-09
Journal
Nature Climate Change, v.11, no.9, pp.758
Publisher
Nature Research
Abstract
© 2021, The Author(s), under exclusive licence to Springer Nature Limited.The current generation of climate models does not properly resolve oceanic mesoscale processes in tropical oceans, such as tropical instability waves. The associated deficit in explicit vertical and lateral heat exchange can further contribute to large-scale equatorial temperature biases, which in turn impact the representation of the El Niño/Southern Oscillation (ENSO) and its sensitivity to greenhouse warming. Here, using a mesoscale-resolving global climate model with an improved representation of tropical climate, we show that a quadrupling of atmospheric CO2 causes a robust weakening of future simulated ENSO sea surface temperature variability. This sensitivity is caused mainly by stronger latent heat flux damping and weaker advective feedbacks. Stratification-induced weakening of tropical instability wave activity and the corresponding growth of ENSO instability partly offset the effect of other negative dynamical feedbacks. Our results demonstrate that previous lower-resolution greenhouse warming projections did not adequately simulate important ENSO-relevant ocean mesoscale processes.
URI
https://pr.ibs.re.kr/handle/8788114/10492
DOI
10.1038/s41558-021-01132-4
ISSN
1758-678X
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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