globalchange  > 气候变化事实与影响
DOI: 10.1002/2014GB005051
Scopus记录号: 2-s2.0-84955209136
论文题名:
Significant mixed layer nitrification in a natural iron-fertilized bloom of the Southern Ocean
作者: Fripiat F; , Elskens M; , Trull T; W; , Blain S; , Cavagna A; -J; , Fernandez C; , Fonseca-Batista D; , Planchon F; , Raimbault P; , Roukaerts A; , Dehairs F
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:11
起始页码: 1929
结束页码: 1943
语种: 英语
英文关键词: iron fertilization ; nitrification ; nitrogen cycle ; Southern Ocean
Scopus关键词: ammonium ; fertilizer ; iron ; mixed layer ; nitrate ; nitrification ; nitrogen cycle ; oxidation ; paradigm shift ; phytoplankton ; primary production ; Indian Ocean ; Kerguelen Plateau ; Southern Ocean
英文摘要: Nitrification, the microbially mediated oxidation of ammonium into nitrate, is generally expected to be low in the Southern Ocean mixed layer. This paradigm assumes that nitrate is mainly provided through vertical mixing and assimilated during the vegetative season, supporting the concept that nitrate uptake is equivalent to the new primary production (i.e., primary production which is potentially available for export). Here we show that nitrification is significant (∼40-80% of the seasonal nitrate uptake) in the naturally iron-fertilized bloom over the southeast Kerguelen Plateau. Hence, a large fraction of the nitrate-based primary production is regenerated, instead of being exported. It appears that nitrate assimilation (light dependent) and nitrification (partly light inhibited) are spatially separated between the upper and lower parts, respectively, of the deep surface mixed layers. These deep mixed layers, extending well below the euphotic layer, allow nitrifiers to compete with phytoplankton for the assimilation of ammonium. The high contributions of nitrification to nitrate uptake are in agreement with both low export efficiency (i.e., the percentage of primary production that is exported) and low seasonal nitrate drawdown despite high nitrate assimilation. © 2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77907
Appears in Collections:气候变化事实与影响

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作者单位: Analytical, Environmental, and Geochemistry, Earth Sciences Research Group, Vrije Universiteit Brussel, Brussels, Belgium; Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, CSIRO Oceans and Atmosphere Flagship, Hobart, Australia; CNRS, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, Sorbonne Universités, UPMC Univ Paris 06, Banyuls sur Mer, France; Laboratoire des Sciences de l'Environment Marin, Institut Européen de la Mer, Plouzané, France; CNRS/INSU, IRD, Mediterranean Institute of Oceanography UMR 7294, Aix-Marseille Université, Marseille, France

Recommended Citation:
Fripiat F,, Elskens M,, Trull T,et al. Significant mixed layer nitrification in a natural iron-fertilized bloom of the Southern Ocean[J]. Global Biogeochemical Cycles,2015-01-01,29(11)
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