气候变化领域集成服务门户(CCPortal): On the role of the Antarctic slope front on the occurrence of the weddell sea polynya under climate change

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DOI	10.1175/JCLI-D-20-0069.1
	On the role of the Antarctic slope front on the occurrence of the weddell sea polynya under climate change
	Lockwood J.W.; Dufour C.O.; Griffies S.M.; Winton M.
发表日期	2021
ISSN	08948755
起始页码	2529
结束页码	2548
卷号	34 期号:7
英文摘要	This study investigates the occurrence of the Weddell Sea polynya under an idealized climate change scenario by evaluating simulations from climate models of different ocean resolutions. The GFDL-CM2.6 climate model, with roughly 3.8-km horizontal ocean grid spacing in the high latitudes, forms a Weddell Sea polynya at similar time and duration under idealized climate change forcing as under preindustrial forcing. In contrast, all convective models forming phase 5 of the Coupled Model Intercomparison Project (CMIP5) show either a cessation or a slowdown of Weddell Sea polynya events under climate warming. The representation of the Antarctic Slope Current and related Antarctic Slope Front is found to be key in explaining the differences between the two categories of models, with these features being more realistic in CM2.6 than in CMIP5. In CM2.6, the freshwater input driven by sea ice melt and enhanced runoff found under climate warming largely remains on the shelf region since the slope front restricts the lateral spread of the freshwater. In contrast, for most CMIP5 models, open-ocean stratification is enhanced by freshening since the absence of a slope front allows coastal freshwater anomalies to spread into the open ocean. This enhanced freshening contributes to the slowdown the occurrence of Weddell Sea polynyas. Hence, an improved representation of Weddell Sea shelf processes in current climate models is desirable to increase our ability to predict the fate of the Weddell Sea polynyas under climate change. © 2021 American Meteorological Society.
英文关键词	Boundary currents; Climate models; Deep convection; Sea ice; Southern Ocean
语种	英语
scopus关键词	Climate models; Oceanography; Sea ice; Water; Climate change scenarios; Climate warming; Coupled Model Intercomparison Project; Freshwater inputs; High Latitudes; Lateral spread; Pre-industrial; Slope currents; Climate change; boundary current; climate change; climate modeling; CMIP; oceanic convection; prediction; scenario analysis; sea ice; Southern Ocean; Weddell Sea
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/178597
作者单位	Department of Atmospheric and Oceanic Science, McGill University, Montreal, QC, Canada; National Oceanic and Atmospheric Administration, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Lockwood J.W.,Dufour C.O.,Griffies S.M.,et al. On the role of the Antarctic slope front on the occurrence of the weddell sea polynya under climate change[J],2021,34(7).
APA	Lockwood J.W.,Dufour C.O.,Griffies S.M.,&Winton M..(2021).On the role of the Antarctic slope front on the occurrence of the weddell sea polynya under climate change.Journal of Climate,34(7).
MLA	Lockwood J.W.,et al."On the role of the Antarctic slope front on the occurrence of the weddell sea polynya under climate change".Journal of Climate 34.7(2021).