气候变化领域集成服务门户(CCPortal): Detection of Transient Denitrification During a High Organic Matter Event in the Black Sea

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DOI	10.1029/2018GB006032
	Detection of Transient Denitrification During a High Organic Matter Event in the Black Sea
	Fuchsman C.A.; Paul B.; Staley J.T.; Yakushev E.V.; Murray J.W.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	143
结束页码	162
卷号	33 期号:2
英文摘要	N 2 production by denitrification can occur in anoxic water or potentially inside organic particles. Here we compare data from the Black Sea, a permanently anoxic basin, during two organic matter regimes: suspended particulate organic matter concentrations were high in the oxycline after the spring bloom in March 2005 compared to lower organic matter concentrations in June 2005, May and October 2007, July 2008, and May 2001. For all cruises, N 2 gas had a maximum in the suboxic zone (O 2 < 10 μmol/L). During the high organic matter event (March 2005), an additional shallower N 2 gas and δ 15 N-N 2 maxima occurred above the suboxic zone in the oxycline where oxygen concentrations were 30–50 μmol/L. Examination of 16S rRNA indicated that anammox bacteria were not present in the oxycline. The δ 15 N of biologically produced N 2 in the oxycline in March 2005 was significantly enriched (+7‰ to +38‰), not depleted, as would be expected from water column fractionation. A simple diffusion calculation indicated that ammonium produced from remineralization inside particles could be oxidized to nitrate and then completely consumed by denitrification inside the particle. In this calculation, half of denitrified N atoms originated from organic N [δ 15 N = 11‰] and half of N atoms originated from ambient nitrate [δ 15 N = 5‰–7‰], producing enriched δ 15 N-N 2 values. We suggest that denitrifiers were active in microzones inside particulates in hypoxic waters above the suboxic zone of the Black Sea. Denitrification in particles may also explain previous data from the oxycline above ocean oxygen deficient zones. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	anammox; black sea; denitrification; N 2 gas; organic matter; stable N isotopes
语种	英语
scopus关键词	ammonia; bacterium; denitrification; nitrogen; nitrogen isotope; organic matter; oxidation; particulate organic matter; remineralization; stable isotope; water column; Black Sea
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/129748
作者单位	School of Oceanography, University of Washington, Seattle, WA, United States; Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, United States; Department of Microbiology, University of Washington, Seattle, WA, United States; Norwegian Institute for Water Research, Oslo, Norway; P.P. Shirshov Institute of Oceanology (Russian Academy of Sciences), Moscow, Russian Federation
推荐引用方式 GB/T 7714	Fuchsman C.A.,Paul B.,Staley J.T.,et al. Detection of Transient Denitrification During a High Organic Matter Event in the Black Sea[J],2019,33(2).
APA	Fuchsman C.A.,Paul B.,Staley J.T.,Yakushev E.V.,&Murray J.W..(2019).Detection of Transient Denitrification During a High Organic Matter Event in the Black Sea.Global Biogeochemical Cycles,33(2).
MLA	Fuchsman C.A.,et al."Detection of Transient Denitrification During a High Organic Matter Event in the Black Sea".Global Biogeochemical Cycles 33.2(2019).