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DOI10.1038/s41586-019-1294-0
Antarctic offshore polynyas linked to Southern Hemisphere climate anomalies
Campbell, Ethan C.1; Wilson, Earle A.1; Moore, G. W. Kent2,3; Riser, Stephen C.1; Brayton, Casey E.4; Mazloff, Matthew R.5; Talley, Lynne D.5
发表日期2019
ISSN0028-0836
EISSN1476-4687
卷号570期号:7761页码:319-+
英文摘要

Offshore Antarctic polynyas -large openings in the winter sea ice cover-are thought to be maintained by a rapid ventilation of deep-ocean heat through convective mixing. These rare phenomena may alter abyssal properties and circulation, yet their formation mechanisms are not well understood. Here we demonstrate that concurrent upper-ocean preconditioning and meteorological perturbations are responsible for the appearance of polynyas in the Weddell Sea region of the Southern Ocean. Autonomous profiling float observations-collected in 2016 and 2017 during the largest polynyas to form near the Maud Rise seamount since 1976 -reveal that the polynyas were initiated and modulated by the passage of severe storms, and that intense heat loss drove deep overturning within them. Wind-driven upwelling of record strength weakened haline stratification in the upper ocean, thus favouring destabilization in 2016 and 2017. We show that previous Weddell polynyas probably developed under similarly anomalous conditions, which are associated with a mode of Southern Hemisphere climate variability that is predicted to strengthen as a result of anthropogenic climate change.


WOS研究方向Science & Technology - Other Topics
来源期刊NATURE
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/99241
作者单位1.Univ Washington, Sch Oceanog, Seattle, WA 98195 USA;
2.Univ Toronto, Dept Phys, Toronto, ON, Canada;
3.Univ Toronto Mississauga, Dept Chem & Phys Sci, Mississauga, ON, Canada;
4.Univ South Carolina, Sch Earth Ocean & Environm, Columbia, SC 29208 USA;
5.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
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Campbell, Ethan C.,Wilson, Earle A.,Moore, G. W. Kent,et al. Antarctic offshore polynyas linked to Southern Hemisphere climate anomalies[J],2019,570(7761):319-+.
APA Campbell, Ethan C..,Wilson, Earle A..,Moore, G. W. Kent.,Riser, Stephen C..,Brayton, Casey E..,...&Talley, Lynne D..(2019).Antarctic offshore polynyas linked to Southern Hemisphere climate anomalies.NATURE,570(7761),319-+.
MLA Campbell, Ethan C.,et al."Antarctic offshore polynyas linked to Southern Hemisphere climate anomalies".NATURE 570.7761(2019):319-+.
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