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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
Other Titles
남극 해빙 증가 및 남빙양 해수면 온도 감소 경향의 열대지역 변동성과의 관련성
Authors
Chung, Eui-Seok
Kim, Seong-Joong
Axel Timmermann
하경자
이상기
Malte F. Stuecker
Keith B. Rodgers
이순선
Lei Huang
Issue Date
2022
Citation
Chung, Eui-Seok, et al. 2022. "Antarctic sea-ice expansion and Southern Ocean cooling linked to tropical variability". NATURE CLIMATE CHANGE, 12(5): 461-480.
Abstract
A variety of hypotheses, involving sub-iceshelf 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 multi-decadal variability in the Southern Ocean that temporarily outweighs the opposing forced response. In both observations and model simulations, Southern Ocean multi-decadal 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://repository.kopri.re.kr/handle/201206/13461
DOI
http://dx.doi.org/10.1038/s41558-022-01339-z
Type
Article
Station
해당사항없음
Indexed
SCIE
Appears in Collections  
2022-2022, Understanding of Antarctic climate and environment and assessments of global influence (22-22) / Kim, Seong-Joong (PE22030)
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