DOI: 10.1029/2018GB005975
论文题名: Biogeochemical Cycling of Dissolved Zinc in the Western Arctic (Arctic GEOTRACES GN01)
作者: Jensen L.T. ; Wyatt N.J. ; Twining B.S. ; Rauschenberg S. ; Landing W.M. ; Sherrell R.M. ; Fitzsimmons J.N.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 3 语种: 英语
英文关键词: advection
; atmospheric deposition
; biogeochemical cycle
; deep water
; dissolved matter
; remineralization
; source-sink dynamics
; trace element
; water column
; zinc
; Arctic
; Atlantic Ocean
; Pacific Ocean
学科: Arctic Ocean
; biogeochemical cycling
; GEOTRACES
; micronutrients
; trace metals
; zinc
中文摘要: The biogeochemical cycling of dissolved zinc (dZn) was investigated in the Western Arctic along the U.S. GEOTRACES GN01 section. Vertical profiles of dZn in the Arctic are strikingly different than the classic “nutrient-type” profile commonly seen in the Atlantic and Pacific Oceans, instead exhibiting higher surface concentrations (~1.1 nmol/kg), a shallow subsurface absolute maximum (~4–6 nmol/kg) at 200 m coincident with a macronutrient maximum, and low deep water concentrations (~1.3 nmol/kg) that are homogeneous (sp.) with depth. In contrast to other ocean basins, typical inputs such as rivers, atmospheric inputs, and especially deep remineralization are insignificant in the Arctic. Instead, we demonstrate that dZn distributions in the Arctic are controlled primarily by (1) shelf fluxes following the sediment remineralization of high Zn:C and Zn:Si cells and the seaward advection of those fluxes and (2) mixing of dZn from source waters such as the Atlantic and Pacific Oceans rather than vertical biological regeneration of dZn. This results in both the unique profile shapes and the largely decoupled relationship between dZn and Si found in the Arctic. We found a weak dZn:Si regression in the full water column (0.077 nmol/μmol, r2 = 0.58) that is higher than the global slope (0.059 nmol/μmol, r2 = 0.94) because of the shelf-derived halocline dZn enrichments. We hypothesize that the decoupling of Zn:Si in Western Arctic deep waters results primarily from a past ventilation event with unique preformed Zn:Si stoichiometries. © 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/160135
Appears in Collections: 气候变化与战略
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作者单位: Department of Oceanography, Texas A&M University, College Station, TX, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Ocean and Earth Sciences, University of Southampton, Waterfront Campus, National Oceanography Centre, Southampton, United Kingdom; Bigelow Laboratory for Ocean Sciences, Boothbay, ME, United States; Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States; Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ, United States
Recommended Citation:
Jensen L.T.,Wyatt N.J.,Twining B.S.,et al. Biogeochemical Cycling of Dissolved Zinc in the Western Arctic (Arctic GEOTRACES GN01)[J]. Global Biogeochemical Cycles,2019-01-01,33(3)