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Antarctic sea-ice expansion and Southern Ocean cooling linked to tropical variability

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Title
Antarctic sea-ice expansion and Southern Ocean cooling linked to tropical variability
Author(s)
Chung, Eui-Seok; Kim, Seong-Joong; Axel Timmermann; Kyung-Ja Ha; Lee, Sang-Ki; Stuecker, Malte F.; Keith B. Rodgers; Sun-Seon Lee; Lei Huang
Publication Date
2022-05
Journal
Nature Climate Change, v.12, no.5, pp.461 - 468
Publisher
Nature Research
Abstract
© 2022, The Author(s), under exclusive licence to Springer Nature Limited.A variety of hypotheses, involving sub-ice-shelf melting, stratospheric ozone depletion and tropical teleconnections, have been proposed to explain the observed Antarctic sea-ice expansion over the period of continuous satellite monitoring and corresponding model–observation discrepancy, but the issue remains unresolved. Here, by comparing multiple large ensembles of model simulations with available observations, we show that Antarctic sea ice has expanded due to ocean surface cooling associated with multidecadal variability in the Southern Ocean that temporarily outweighs the opposing forced response. In both observations and model simulations, Southern Ocean multidecadal variability is closely linked to internal variability in the tropics, especially in the Pacific, via atmospheric teleconnections. The linkages are, however, distinctly weaker in simulations than in observations, accompanied by a marked model–observation mismatch in global warming resulting from potential model bias in the forced response and observed tropical variability. Thus, the forced response dominates in simulations, resulting in apparent model–observation discrepancy.
URI
https://pr.ibs.re.kr/handle/8788114/11411
DOI
10.1038/s41558-022-01339-z
ISSN
1758-678X
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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