DOI: 10.1029/2018GB006134
论文题名: Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay
作者: Lehmann N. ; Kienast M. ; Granger J. ; Bourbonnais A. ; Altabet M.A. ; Tremblay J.-É.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 6 语种: 英语
英文关键词: 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)
学科: Arctic Ocean
; GEOTRACES
; isotopomers
; nitrate isotopes
; nitrous oxide
; nutrients
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160127
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Lehmann N.,Kienast M.,Granger J.,et al. Remote Western Arctic Nutrients Fuel Remineralization in Deep Baffin Bay[J]. Global Biogeochemical Cycles,2019-01-01,33(6)