DOI: 10.1029/2018GB005887
论文题名: Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification
作者: Ji Q. ; Buitenhuis E. ; Suntharalingam P. ; Sarmiento J.L. ; Ward B.B.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 12 语种: 英语
英文关键词: ammonium
; biogeochemistry
; denitrification
; global ocean
; greenhouse gas
; marine environment
; model
; nitrification
; nitrous oxide
; oxygen
; oxygen minimum layer
; ozone depletion
; Pacific Ocean
; Pacific Ocean (Tropical)
学科: biogeochemical model
; marine environment
; nitrous oxide
; oxygen control
; oxygen minimum zones
; production
中文摘要: The ocean is estimated to contribute up to ~20% of global fluxes of atmospheric nitrous oxide (N 2 O), an important greenhouse gas and ozone depletion agent. Marine oxygen minimum zones contribute disproportionately to this flux. To further understand the partition of nitrification and denitrification and their environmental controls on marine N 2 O fluxes, we report new relationships between oxygen concentration and rates of N 2 O production from nitrification and denitrification directly measured with 15 N tracers in the Eastern Tropical Pacific. Highest N 2 O production rates occurred near the oxic-anoxic interface, where there is strong potential for N 2 O efflux to the atmosphere. The dominant N 2 O source in oxygen minimum zones was nitrate reduction, the rates of which were 1 to 2 orders of magnitude higher than those of ammonium oxidation. The presence of oxygen significantly inhibited the production of N 2 O from both nitrification and denitrification. These experimental data provide new constraints to a multicomponent global ocean biogeochemical model, which yielded annual oceanic N 2 O efflux of 1.7–4.4 Tg-N (median 2.8 Tg-N, 1 Tg = 10 12 g), with denitrification contributing 20% to the oceanic flux. Thus, denitrification should be viewed as a net N 2 O production pathway in the marine environment. ©2018. 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/160172
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, Princeton University, Princeton, NJ, United States; Now at Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; School of Environmental Science, University of East Anglia, Norfolk, United Kingdom; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
Recommended Citation:
Ji Q.,Buitenhuis E.,Suntharalingam P.,et al. Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification[J]. Global Biogeochemical Cycles,2018-01-01,32(12)