气候变化领域集成服务门户(CCPortal): Hotspots of Dense Water Cascading in the Arctic Ocean: Implications for the Pacific Water Pathways

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DOI	10.1029/2020JC016044
	Hotspots of Dense Water Cascading in the Arctic Ocean: Implications for the Pacific Water Pathways
	Luneva M.V.; Ivanov V.V.; Tuzov F.; Aksenov Y.; Harle J.D.; Kelly S.; Holt J.T.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	We explore dense water cascading (DWC), a type of bottom-trapped gravity current, on multidecadal time scales using a pan-Arctic regional ocean-ice model. DWC is particularly important in the Arctic Ocean as the main mechanism of ventilation of interior waters when open ocean convection is blocked by strong density stratification. We identify the locations where the most intense DWC events occur and evaluate the associated cross-shelf mass, heat, and salt fluxes. We find that the modeled locations of cascading agree well with the sparse historical observations and that cascading is the dominant process responsible for cross-shelf exchange in the boundary layers. Simulated DWC fluxes of 1.3 Sv (1 Sv = 106 m3/s) in the Central Arctic are comparable to Bering Strait inflow, with associated surface and benthic Ekman fluxes of 0.85 and 0.58 Sv. With ice decline, both surface Ekman flux and DWC fluxes are increasing at a rate of 0.023 and 0.0175 Sv/year, respectively. A detailed analysis of specific cascading sites around the Beaufort Gyre and adjacent regions shows that autumn upwelling of warm and saltier Atlantic waters on the shelf and subsequent cooling and mixing of uplifted waters trigger the cascading on the West Chukchi Sea shelf break. Lagrangian particle tracking of low salinity Pacific waters originating at the surface in the Bering Strait shows that these waters are modified by brine rejection and cooling, and through subsequent mixing become dense enough to reach depths of 160–200 m. ©2020. The Authors.
英文关键词	3-D modeling; Arctic Ocean; Canadian Basin; Chukchi Sea; cross-shelf fluxes; dense water cascades
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/186620
作者单位	National Oceanography Centre, Joseph Proudman Building, Liverpool, United Kingdom; Geography Department, Moscow State University, Moscow, Russian Federation; Arctic and Antarctic Research Institute, St. Petersburg, Russian Federation; National Oceanography Centre, Southampton, United Kingdom
推荐引用方式 GB/T 7714	Luneva M.V.,Ivanov V.V.,Tuzov F.,et al. Hotspots of Dense Water Cascading in the Arctic Ocean: Implications for the Pacific Water Pathways[J],2020,125(10).
APA	Luneva M.V..,Ivanov V.V..,Tuzov F..,Aksenov Y..,Harle J.D..,...&Holt J.T..(2020).Hotspots of Dense Water Cascading in the Arctic Ocean: Implications for the Pacific Water Pathways.Journal of Geophysical Research: Oceans,125(10).
MLA	Luneva M.V.,et al."Hotspots of Dense Water Cascading in the Arctic Ocean: Implications for the Pacific Water Pathways".Journal of Geophysical Research: Oceans 125.10(2020).