期刊
NATURE
卷 558, 期 7710, 页码 383-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41586-018-0212-1
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资金
- Australian Government's Cooperative Research Centres Programme through the Antarctic Climate and Ecosystems Cooperative Research Centre [4116]
- NSF [PLR 17-020175, PLR 1440435]
- US Office of Naval Research Departmental Research Initiative Sea State and Boundary Layer Physics of the Emerging Arctic Ocean [N00014-131-0279]
Understanding the causes of recent catastrophic ice shelf disintegrations is a crucial step towards improving coupled models of the Antarctic Ice Sheet and predicting its future state and contribution to sea-level rise. An overlooked climate related causal factor is regional sea ice loss. Here we show that for the disintegration events observed (the collapse of the Larsen A and B and Wilkins ice shelves), the increased seasonal absence of a protective sea ice buffer enabled increased flexure of vulnerable outer ice shelf margins by ocean swells that probably weakened them to the;point of calving. This outer-margin calving triggered wider-scale disintegration of ice shelves compromised by multiple factors in preceding years, with key prerequisites being extensive flooding and miter-margin fracturing. Wave-induced flexure is particularly effective in outermost ice shelf regions thinned by bottom crevassing. Our analysis of satellite and ocean-wave data and modelling of combined ice shelf, sea ice and wave properties, highlights the need for ice sheet models to account for sea ice and ocean waves.
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