气候变化领域集成服务门户(CCPortal): Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification

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DOI	10.1029/2018GB005887
	Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification
	Ji Q.; Buitenhuis E.; Suntharalingam P.; Sarmiento J.L.; Ward B.B.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1790
结束页码	1802
卷号	32 期号:12
英文摘要	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.
英文关键词	biogeochemical model; marine environment; nitrous oxide; oxygen control; oxygen minimum zones; production
语种	英语
scopus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)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129768
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
推荐引用方式 GB/T 7714	Ji Q.,Buitenhuis E.,Suntharalingam P.,et al. Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification[J],2018,32(12).
APA	Ji Q.,Buitenhuis E.,Suntharalingam P.,Sarmiento J.L.,&Ward B.B..(2018).Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification.Global Biogeochemical Cycles,32(12).
MLA	Ji Q.,et al."Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification".Global Biogeochemical Cycles 32.12(2018).