气候变化领域集成服务门户(CCPortal): Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay

CCPortal

DOI	10.1029/2018GB006134
	Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay
	Lehmann N.; Kienast M.; Granger J.; Bourbonnais A.; Altabet M.A.; Tremblay J.-É.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	649
结束页码	667
卷号	33 期号:6
英文摘要	The oceanic nitrogen cycle is critically important for the partitioning of greenhouse gases between ocean and atmosphere. Baffin Bay connects ocean regions that are major sources (North Atlantic) and sinks (North Pacific and western Arctic) of biologically available nitrogen and further harbors supersaturation of nitrous oxide and a coincident deficit in nitrate in the deep basin. Isotopic tracer profiles of both nitrogen species presented here provide novel insights into the origin and cycling of reactive nitrogen in Baffin Bay, highlighting the connectivity between different Arctic systems and horizontal components of basin-scale nutrient transport. Baffin Bay bottom water properties are derived from export production in northern Baffin Bay, which is largely fueled by Pacific-derived nutrients. In situ remineralization at depth gives rise to benthic denitrification, evidenced by a pronounced accumulation of nitrous oxide with a distinctively high site preference (<44‰) in the deep basin. Nutrients supplied to Baffin Bay are hence stripped from surface waters and trapped at depth over long timescales, where sedimentary denitrification further adds to the N removal capacity of the Arctic Ocean. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic Ocean; GEOTRACES; isotopomers; nitrate isotopes; nitrous oxide; nutrients
语种	英语
scopus关键词	biogeochemistry; bottom water; denitrification; geoaccumulation; isotopic composition; nitrate; nitrogen cycle; remineralization; supersaturation; tracer; Arctic Ocean; Atlantic Ocean; Atlantic Ocean (North); Baffin Bay [Arctic Ocean]; Pacific Ocean; Pacific Ocean (North)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129730
作者单位	Department of Oceanography, Dalhousie University, Halifax, NS, Canada; Department of Marine Sciences, University of Connecticut, Groton, CT, United States; School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC, United States; School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, MA, United States; Québec-Océan and Département de Biologie, Université Laval, Québec City, QC, Canada
推荐引用方式 GB/T 7714	Lehmann N.,Kienast M.,Granger J.,et al. Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay[J],2019,33(6).
APA	Lehmann N.,Kienast M.,Granger J.,Bourbonnais A.,Altabet M.A.,&Tremblay J.-É..(2019).Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay.Global Biogeochemical Cycles,33(6).
MLA	Lehmann N.,et al."Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay".Global Biogeochemical Cycles 33.6(2019).