DOI: 10.1038/ngeo1739
论文题名: Nitrogen cycling driven by organic matter export in the South Pacific oxygen minimum zone
作者: Kalvelage T. ; Lavik G. ; Lam P. ; Contreras S. ; Arteaga L. ; Löscher C.R. ; Oschlies A. ; Paulmier A. ; Stramma L. ; Kuypers M.M.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 3 起始页码: 228
结束页码: 234
语种: 英语
Scopus关键词: ammonium
; anoxic conditions
; bottom water
; denitrification
; dominance
; nitrogen cycle
; numerical model
; organic matter
; oxidation
; oxygen minimum layer
; sampling
; water column
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: Oxygen minimum zones are expanding globally, and at present account for around 20-40% of oceanic nitrogen loss. Heterotrophic denitrification and anammox-anaerobic ammonium oxidation with nitrite-are responsible for most nitrogen loss in these low-oxygen waters. Anammox is particularly significant in the eastern tropical South Pacific, one of the largest oxygen minimum zones globally. However, the factors that regulate anammox-driven nitrogen loss have remained unclear. Here, we present a comprehensive nitrogen budget for the eastern tropical South Pacific oxygen minimum zone, using measurements of nutrient concentrations, experimentally determined rates of nitrogen transformation and a numerical model of export production. Anammox was the dominant mode of nitrogen loss at the time of sampling. Rates of anammox, and related nitrogen transformations, were greatest in the productive shelf waters, and tailed off with distance from the coast. Within the shelf region, anammox activity peaked in both upper and bottom waters. Overall, rates of nitrogen transformation, including anammox, were strongly correlated with the export of organic matter. We suggest that the sinking of organic matter, and thus the release of ammonium into the water column, together with benthic ammonium release, fuel nitrogen loss from oxygen minimum zones. Copyright © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106857
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Max Planck Institute for Marine Microbiology, 28195 Bremen, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, 24105 Kiel, Germany; Institute for General Microbiology, 24118 Kiel, Germany; Large Lakes Observatory, University of Minnesota Duluth, Minnesota, MN 55812, United States; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, UMR 5566, 18 Avenue Edouard Belin, 31401 Toulouse Cedex 9, France; Instituto del Mar del Perú (IMARPE), Esquina Gamarra y General Valle, S/N Chucuito, Lima, Peru
Recommended Citation:
Kalvelage T.,Lavik G.,Lam P.,et al. Nitrogen cycling driven by organic matter export in the South Pacific oxygen minimum zone[J]. Nature Geoscience,2013-01-01,6(3)