DOI: 10.1038/ngeo2847
论文题名: N2 production rates limited by nitrite availability in the Bay of Bengal oxygen minimum zone
作者: Bristow L.A. ; Callbeck C.M. ; Larsen M. ; Altabet M.A. ; Dekaezemacker J. ; Forth M. ; Gauns M. ; Glud R.N. ; Kuypers M.M.M. ; Lavik G. ; Milucka J. ; Naqvi S.W.A. ; Pratihary A. ; Revsbech N.P. ; Thamdrup B. ; Treusch A.H. ; Canfield D.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 1 起始页码: 24
结束页码: 29
语种: 英语
Scopus关键词: anthropogenic effect
; denitrification
; microbial activity
; microbial community
; nitrite
; nitrogen
; nitrogen compound
; nitrogen cycle
; open ocean
; oxygen minimum layer
; seawater
; water column
; Bay of Bengal
; Indian Ocean
英文摘要: A third or more of the fixed nitrogen lost from the oceans as N 2 is removed by anaerobic microbial processes in open ocean oxygen minimum zones. These zones have expanded over the past decades, and further anthropogenically induced expansion could accelerate nitrogen loss. However, in the Bay of Bengal there has been no indication of nitrogen loss, although oxygen levels are below the detection level of conventional methods (1 to 2 μM). Here we quantify the abundance of microbial genes associated with N 2 production, measure nitrogen transformations in incubations of sampled seawater with isotopically labelled nitrogen compounds and analyse geochemical signatures of these processes in the water column. We find that the Bay of Bengal supports denitrifier and anammox microbial populations, mediating low, but significant N loss. Yet, unlike other oxygen minimum zones, our measurements using a highly sensitive oxygen sensor demonstrate that the Bay of Bengal has persistent concentrations of oxygen in the 10 to 200 nM range. We propose that this oxygen supports nitrite oxidation, thereby restricting the nitrite available for anammox or denitrification. If these traces of oxygen were removed, nitrogen loss in the Bay of Bengal oxygen minimum zone waters could accelerate to global significance. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105872
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: Department of Biology, Nordic Center for Earth Evolution (NordCEE), University of Southern Denmark, Campusvej 55, Odense M, Denmark; Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, Bremen, Germany; School for Marine Science and Technology, University of Massachusetts Dartmouth, 706 South Rodney French Boulevard, New Bedford, MA, United States; CSIR, National Institute of Oceanography, Dona Paula, Goa, India; Department of Bioscience, Aarhus University, Aarhus C, Denmark
Recommended Citation:
Bristow L.A.,Callbeck C.M.,Larsen M.,et al. N2 production rates limited by nitrite availability in the Bay of Bengal oxygen minimum zone[J]. Nature Geoscience,2017-01-01,10(1)