气候变化领域集成服务门户(CCPortal): Impacts of ice-shelf melting on water-mass transformation in the Southern Ocean from E3SM simulations

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DOI	10.1175/JCLI-D-19-0683.1
	Impacts of ice-shelf melting on water-mass transformation in the Southern Ocean from E3SM simulations
	Jeong H.; Asay-Davis X.S.; Turner A.K.; Comeau D.S.; Price S.F.; Abernathey R.P.; Veneziani M.; Petersen M.R.; Hoffman M.J.; Mazloff M.R.; Ringler T.D.
发表日期	2020
ISSN	0894-8755
起始页码	5787
结束页码	5807
卷号	33 期号:13
英文摘要	The Southern Ocean overturning circulation is driven by winds, heat fluxes, and freshwater sources. Among these sources of freshwater, Antarctic sea ice formation and melting play the dominant role. Even though ice-shelf melt is relatively small in magnitude, it is located close to regions of convection, where it may influence dense water formation. Here, we explore the impacts of ice-shelf melting on Southern Ocean water-mass transformation (WMT) using simulations from the Energy Exascale Earth System Model (E3SM) both with and without the explicit representation of melt fluxes from beneath Antarctic ice shelves. We find that ice-shelf melting enhances transformation of Upper Circumpolar Deep Water, converting it to lower density values. While the overall differences in Southern Ocean WMT between the two simulations are moderate, freshwater fluxes produced by ice-shelf melting have a further, indirect impact on the Southern Ocean overturning circulation through their interaction with sea ice formation and melting, which also cause considerable upwelling. We further find that surface freshening and cooling by ice-shelf melting cause increased Antarctic sea ice production and stronger density stratification near the Antarctic coast. In addition, ice-shelf melting causes decreasing air temperature, which may be directly related to sea ice expansion. The increased stratification reduces vertical heat transport from the deeper ocean. Although the addition of ice-shelf melting processes leads to no significant changes in Southern Ocean WMT, the simulations and analysis conducted here point to a relationship between increased Antarctic ice-shelf melting and the increased role of sea ice in Southern Ocean overturning. © 2020 American Meteorological Society.
英文关键词	Melting; Sea ice; Water; Antarctic ice shelves; Density stratification; Earth system model; Explicit representation; Overturning circulation; Surface freshening; Upper Circumpolar Deep Water; Water mass transformation; Oceanography; computer simulation; general circulation model; ice shelf; overturn; sea ice; water mass; Southern Ocean
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171261
作者单位	Los Alamos National Laboratory, Los Alamos, NM, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Scripps Institution of Oceanography, San diego, CA, United States
推荐引用方式 GB/T 7714	Jeong H.,Asay-Davis X.S.,Turner A.K.,et al. Impacts of ice-shelf melting on water-mass transformation in the Southern Ocean from E3SM simulations[J],2020,33(13).
APA	Jeong H..,Asay-Davis X.S..,Turner A.K..,Comeau D.S..,Price S.F..,...&Ringler T.D..(2020).Impacts of ice-shelf melting on water-mass transformation in the Southern Ocean from E3SM simulations.Journal of Climate,33(13).
MLA	Jeong H.,et al."Impacts of ice-shelf melting on water-mass transformation in the Southern Ocean from E3SM simulations".Journal of Climate 33.13(2020).