气候变化领域集成服务门户(CCPortal): Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf

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DOI	10.1029/2019JC015678
	Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf
	Brett G.M.; Irvin A.; Rack W.; Haas C.; Langhorne P.J.; Leonard G.H.
发表日期	2020
ISSN	21699275
卷号	125 期号:3
英文摘要	Variability in the volume of supercooled Ice Shelf Water outflow in McMurdo Sound is reflected in the thickness and distribution of fast ice and the sub-ice platelet layer beneath. Ground-based electromagnetic induction and drill hole surveys of the distribution and thickness of ice shelf-influenced fast ice and the sub-ice platelet layer in McMurdo Sound were carried out in late spring of 2011, 2013, 2016, and 2017. In 2011 and 2017, thicker sub-ice platelet layers of up to 7.5 and 6 m were observed, respectively. Fast ice formation throughout the winters of 2011 and 2017 was influenced by a higher occurrence of strong southerly wind events and resultant activity of the Ross Sea Polynya. In contrast, lower wind conditions in 2016 led to largely undisturbed sea ice growth and anomalously extensive fast ice coverage. A thinner sub-ice platelet layer of up to 4 m was observed in 2016. In 2011 and 2017, substantial and variable sub-ice platelet layers were detected in a region of exchange of water masses between the Ross Sea and the McMurdo-Ross ice shelf cavity, which were not observed in 2013 and 2016. We hypothesize that a higher frequency of strong southerly wind events, resultant polynya activity, and High Salinity Shelf Water production over winter accelerates circulation and increases melting in the proximal shallow McMurdo Ice Shelf and the deeper Ross Ice Shelf regions of the conjoined cavity. The outflow of supercooled Ice Shelf Water and sub-ice platelet layer formation in McMurdo Sound are consequently promoted. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	coastal polynya; electromagnetic (EM) induction; ice shelf water; land-fast sea ice thickness; subice platelet layer; supercooling
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186953
作者单位	Gateway Antarctica, University of Canterbury, Christchurch, New Zealand; Department of Earth and Space Science and Engineering, York University, Toronto, ON, Canada; Sea Ice Physics, Alfred Wegener Institute, Bremerhaven, Germany; Department of Physics, University of Otago, Dunedin, New Zealand; School of Surveying, University of Otago, Dunedin, New Zealand
推荐引用方式 GB/T 7714	Brett G.M.,Irvin A.,Rack W.,et al. Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf[J],2020,125(3).
APA	Brett G.M.,Irvin A.,Rack W.,Haas C.,Langhorne P.J.,&Leonard G.H..(2020).Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf.Journal of Geophysical Research: Oceans,125(3).
MLA	Brett G.M.,et al."Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf".Journal of Geophysical Research: Oceans 125.3(2020).