气候变化领域集成服务门户(CCPortal): A source of isotopically light organic carbon in a low-pH anoxic marine zone

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DOI	10.1038/s41467-021-21871-4
	A source of isotopically light organic carbon in a low-pH anoxic marine zone
	Vargas C.A.; Cantarero S.I.; Sepúlveda J.; Galán A.; De Pol-Holz R.; Walker B.; Schneider W.; Farías L.; D’Ottone M.C.; Walker J.; Xu X.; Salisbury J.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Geochemical and stable isotope measurements in the anoxic marine zone (AMZ) off northern Chile during periods of contrasting oceanographic conditions indicate that microbial processes mediating sulfur and nitrogen cycling exert a significant control on the carbonate chemistry (pH, AT, DIC and pCO2) of this region. Here we show that in 2015, a large isotopic fractionation between DIC and POC, a DIC and N deficit in AMZ waters indicate the predominance of in situ dark carbon fixation by sulfur-driven autotrophic denitrification in addition to anammox. In 2018, however, the fractionation between DIC and POC was significantly lower, while the total alkalinity increased in the low-pH AMZ core, suggesting a predominance of heterotrophic processes. An isotope mass-balance model demonstrates that variations in the rates of sulfur- and nitrogen-mediated carbon fixation in AMZ waters contribute ~7–35% of the POC exported to deeper waters. Thus, dark carbon fixation should be included in assessments of future changes in carbon cycling and carbonate chemistry due to AMZ expansion. © 2021, The Author(s).
语种	英语
scopus关键词	carbon; carbonic acid; nitrogen; organic carbon; oxygen; sulfur; water; anoxic conditions; carbon fixation; carbonate system; denitrification; isotopic fractionation; organic carbon; particulate organic carbon; stable isotope; alkalinity; anaerobic ammonium oxidation; Article; carbon cycling; carbon dioxide tension; carbon fixation; denitrification; fractionation; heterotrophy; inorganic nutrient; light; microbial community; pH; salinity; temperature; Chile
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250746
作者单位	Department of Aquatic System, Faculty of Environmental Sciences & Environmental Sciences Center EULA Chile, Universidad de Concepción, Concepción, Chile; Millennium Institute of Oceanography (IMO), Universidad de Concepción, Concepción, Chile; Coastal Social-Ecological Millennium Institute (SECOS), Universidad de Concepción, Concepción, Chile; Department of Geological Sciences and Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, CO, United States; Centro de Investigación de Estudios Avanzados del Maule (CIEAM), Departamento de Obras Civiles, Facultad de Ciencias de la Ingeniería, Universidad Católica del Maule, Talca, Chile; Centro Regional de Estudios Ambientales (CREA), Universidad Católica de la Santísima Concepción, Concepción, Chile; Centro de Investigación GAIA-Antártica (CIGA) and Network for Extreme Environment Research (NEXER), Universidad de Magallanes, Punta Arenas, Chile; Department of Earth and Environmental Sciences, University of Ottawa, Ottawa, Ca...
推荐引用方式 GB/T 7714	Vargas C.A.,Cantarero S.I.,Sepúlveda J.,et al. A source of isotopically light organic carbon in a low-pH anoxic marine zone[J],2021,12(1).
APA	Vargas C.A..,Cantarero S.I..,Sepúlveda J..,Galán A..,De Pol-Holz R..,...&Salisbury J..(2021).A source of isotopically light organic carbon in a low-pH anoxic marine zone.Nature Communications,12(1).
MLA	Vargas C.A.,et al."A source of isotopically light organic carbon in a low-pH anoxic marine zone".Nature Communications 12.1(2021).