气候变化领域集成服务门户(CCPortal): Control of the Oceanic Heat Content of the Getz-Dotson Trough, Antarctica, by the Amundsen Sea Low

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DOI	10.1029/2020JC016113
	Control of the Oceanic Heat Content of the Getz-Dotson Trough, Antarctica, by the Amundsen Sea Low
	Dotto T.S.; Naveira Garabato A.C.; Wåhlin A.K.; Bacon S.; Holland P.R.; Kimura S.; Tsamados M.; Herraiz-Borreguero L.; Kalén O.; Jenkins A.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	The changing supply of warm Circumpolar Deep Water (CDW) to the West Antarctic continental shelf is responsible for the basal melting and thinning of the West Antarctic ice shelves that has occurred in recent decades. Here we assess the variability in CDW supply, and its drivers, from a multiyear mooring deployed in, and a regional ocean model spanning, the Getz-Dotson Trough, Amundsen Sea. Between 2010 to 2015, the CDW within the trough underwent a pronounced cooling and freshening, associated with changes in thermohaline properties on isopycnals. Variability in the rate of CDW inflow is controlled by local wind forcing of a shelf break undercurrent, which determines the hydrographic properties of inflowing CDW via tilting of density surfaces above the continental slope. Local wind is coupled to the Amundsen Sea Low (ASL) low-pressure system, which is modulated by large-scale climatic modes via atmospheric teleconnections. For the period analyzed, a deeper ASL was associated with westward wind anomaly at the shelf break. Changes in the sea surface slope decelerated the shelf break undercurrent, resulting in less heat accessing the continental shelf and, consequently, a cooling of the Getz-Dotson Trough. Therefore, the present work suggests that the fate of the West Antarctic ice shelves is closely tied to the future evolution of the ASL. ©2020. The Authors.
英文关键词	atmospheric teleconnections; Circumpolar Deep Water; open ocean-shelf exchange; Southern Ocean; West Antarctic ice shelves
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/186740
作者单位	Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; Laboratório de Estudos dos Oceanos e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil; Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden; National Oceanography Centre, Southampton, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom; Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Centre for Polar Observation and Modelling, Department of Earth Sciences, University College London, London, United Kingdom; Commonwealth Scientific and Industrial Research Organisation Oceans and Atmosphere and Centre for Southern Hemisphere Oceans Research, Hobart, TAS, Australia; Swedish Meteorological and Hydrological Institute, Gothenburg, Sweden; Now at Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
推荐引用方式 GB/T 7714	Dotto T.S.,Naveira Garabato A.C.,Wåhlin A.K.,et al. Control of the Oceanic Heat Content of the Getz-Dotson Trough, Antarctica, by the Amundsen Sea Low[J],2020,125(8).
APA	Dotto T.S..,Naveira Garabato A.C..,Wåhlin A.K..,Bacon S..,Holland P.R..,...&Jenkins A..(2020).Control of the Oceanic Heat Content of the Getz-Dotson Trough, Antarctica, by the Amundsen Sea Low.Journal of Geophysical Research: Oceans,125(8).
MLA	Dotto T.S.,et al."Control of the Oceanic Heat Content of the Getz-Dotson Trough, Antarctica, by the Amundsen Sea Low".Journal of Geophysical Research: Oceans 125.8(2020).