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DOI10.5194/tc-15-2147-2021
Atmospheric extremes caused high oceanward sea surface slope triggering the biggest calving event in more than 50 years at the Amery Ice Shelf
Francis D.; Mattingly K.S.; Lhermitte S.; Temimi M.; Heil P.
发表日期2021
ISSN19940416
起始页码2147
结束页码2165
卷号15期号:5
英文摘要Ice shelf instability is one of the main sources of uncertainty in Antarctica's contribution to future sea level rise. Calving events play a crucial role in ice shelf weakening but remain unpredictable, and their governing processes are still poorly understood. In this study, we analyze the unexpected September 2019 calving event from the Amery Ice Shelf, the largest since 1963 and which occurred almost a decade earlier than expected, to better understand the role of the atmosphere in calving.We find that atmospheric extremes provided a deterministic role in this event. A series of anomalously deep and stationary explosive twin polar cyclones over the Cooperation and Davis seas generated tides and winddriven ocean slope, leading to fracture amplification along the pre-existing rift and ultimately calving of the massive iceberg. The calving was triggered by high oceanward sea surface slopes produced by the storms. The observed recordanomalous atmospheric conditions were promoted by blocking ridges and Antarctic-wide anomalous poleward transport of heat and moisture. Blocking highs helped in (i) directing moist and warm air masses towards the ice shelf and (ii) maintaining the observed extreme cyclones stationary at the front of the ice shelf for several days. Accumulation of cold air over the ice sheet, due to the blocking highs, led to the formation of an intense cold high pressure over the ice sheet, which helped fuel sustained anomalously deep cyclones via increased baroclinicity. Our results stress the importance of atmospheric extremes in ice shelf dynamics via tides and sea surface slope and its need to be accounted for when considering Antarctic ice shelf variability and contribution to sea level, especially given that more of these extremes are predicted under a warmer climate. © Author(s) 2021.
英文关键词air-sea interaction; atmosphere-ocean coupling; ice shelf; iceberg calving; sea surface; Antarctic Ice Sheet; Antarctica
语种英语
来源期刊Cryosphere
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/202308
作者单位Environmental and Geophysical Sciences (ENGEOS) Lab, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates; Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers University, New Brunswick, NJ 08901-8554, United States; Department of Geoscience and Remote Sensing, Delft University of Technology, Mekelweg 5, Delft, 2628 CD, Netherlands; Department of Civil, Environmental and Ocean Engineering (CEOE), Stevens Institute of Technology, Hoboken, NJ 07030, United States; Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart, TAS 7001, Australia
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Francis D.,Mattingly K.S.,Lhermitte S.,et al. Atmospheric extremes caused high oceanward sea surface slope triggering the biggest calving event in more than 50 years at the Amery Ice Shelf[J],2021,15(5).
APA Francis D.,Mattingly K.S.,Lhermitte S.,Temimi M.,&Heil P..(2021).Atmospheric extremes caused high oceanward sea surface slope triggering the biggest calving event in more than 50 years at the Amery Ice Shelf.Cryosphere,15(5).
MLA Francis D.,et al."Atmospheric extremes caused high oceanward sea surface slope triggering the biggest calving event in more than 50 years at the Amery Ice Shelf".Cryosphere 15.5(2021).
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