气候变化领域集成服务门户(CCPortal): Gallium: A New Tracer of Pacific Water in the Arctic Ocean

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DOI	10.1029/2019JC015842
	Gallium: A New Tracer of Pacific Water in the Arctic Ocean
	Whitmore L.M.; Pasqualini A.; Newton R.; Shiller A.M.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	Determining the proportions of Atlantic and Pacific Ocean seawater entering the Arctic Ocean is important both for understanding the mass balance of this basin as well as its contribution to formation of North Atlantic deep water. To quantify the distribution and amount of Pacific and Atlantic origin seawater in the western Arctic Ocean, we used dissolved Ga in a four-component linear endmember mixing model. Previously, nutrients, combined in their Redfield ratios, have been used to separate Pacific- and Atlantic-derived waters. These nutrient tracers are not conservative in practice, and there is a need to find quantities that are conserved. Dissolved Ga concentrations show measurable contrast between Atlantic and Pacific source waters, shelf-influenced waters show little impact of shelf processes on the dissolved Ga distribution, and dissolved Ga in the Arctic basins is conserved along isopycnal surfaces. Thus, we explored the potential of Ga as a new parameter in Arctic source water deconvolution. The Ga-informed deconvolution was compared to that generated with the NO3:PO4 relationship. While distributions of the water masses were qualitatively similar, the Ga-based deconvolution predicted higher amounts of Pacific water at depths between 150 and 300 m. The Ga-based decomposition yields a smoother transition between the halocline and Atlantic layers, while nutrient-based solutions have sharper transitions. A 1-D advection-diffusion model was used to constrain estimates of vertical diffusivity (Kz). The Ga-based Kz estimates agreed better with those from salinity and temperature than the nutrient method. The Ga-based approach implies greater vertical mixing between the Pacific and Atlantic waters. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic Ocean; gallium; GEOTRACES; trace elements; water mass tracer
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/186797
作者单位	School of Ocean Science and Engineering, University of Southern Mississippi, Stennis Space CenterMS, United States; Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Palisades, NY, United States
推荐引用方式 GB/T 7714	Whitmore L.M.,Pasqualini A.,Newton R.,et al. Gallium: A New Tracer of Pacific Water in the Arctic Ocean[J],2020,125(7).
APA	Whitmore L.M.,Pasqualini A.,Newton R.,&Shiller A.M..(2020).Gallium: A New Tracer of Pacific Water in the Arctic Ocean.Journal of Geophysical Research: Oceans,125(7).
MLA	Whitmore L.M.,et al."Gallium: A New Tracer of Pacific Water in the Arctic Ocean".Journal of Geophysical Research: Oceans 125.7(2020).