气候变化领域集成服务门户(CCPortal): Impact of West Antarctic ice shelf melting on Southern Ocean hydrography

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DOI	10.5194/tc-14-2205-2020
	Impact of West Antarctic ice shelf melting on Southern Ocean hydrography
	Nakayama Y.; Timmermann R.; Hellmer H.H.
发表日期	2020
ISSN	19940416
起始页码	2205
结束页码	2216
卷号	14 期号:7
英文摘要	Previous studies show accelerations of West Antarctic glaciers, implying that basal melt rates of these glaciers were previously small and increased in the middle of the 20th century. This enhanced melting is a likely source of the observed Ross Sea (RS) freshening, but its long-term impact on the Southern Ocean hydrography has not been well investigated. Here, we conduct coupled sea ice-ice shelf-ocean simulations with different levels of ice shelf melting from West Antarctic glaciers. Freshening of RS shelf and bottom water is simulated with enhanced West Antarctic ice shelf melting, while no significant changes in shelf water properties are simulated when West Antarctic ice shelf melting is small. We further show that the freshening caused by glacial meltwater from ice shelves in the Amundsen and Bellingshausen seas can propagate further downstream along the East Antarctic coast into the Weddell Sea. The freshening signal propagates onto the RS continental shelf within a year of model simulation, while it takes roughly 5-10 and 10-15 years to propagate into the region off Cape Darnley and into the Weddell Sea, respectively. This advection of freshening modulates the shelf water properties and possibly impacts the production of Antarctic Bottom Water if the enhanced melting of West Antarctic ice shelves continues for a longer period. © Royal Society Open Science. All rights reserved.
英文关键词	advection; Antarctic Bottom Water; continental shelf; hydrography; ice shelf; melting; meltwater; sea ice; Ross Sea; Southern Ocean; Weddell Sea
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/202164
作者单位	Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Alfred Wegener Institute, Bremerhaven, Germany
推荐引用方式 GB/T 7714	Nakayama Y.,Timmermann R.,Hellmer H.H.. Impact of West Antarctic ice shelf melting on Southern Ocean hydrography[J],2020,14(7).
APA	Nakayama Y.,Timmermann R.,&Hellmer H.H..(2020).Impact of West Antarctic ice shelf melting on Southern Ocean hydrography.Cryosphere,14(7).
MLA	Nakayama Y.,et al."Impact of West Antarctic ice shelf melting on Southern Ocean hydrography".Cryosphere 14.7(2020).