气候变化领域集成服务门户(CCPortal): Latitudinal gradient in the respiration quotient and the implications for ocean oxygen availability

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DOI	10.1073/pnas.2004986117
	Latitudinal gradient in the respiration quotient and the implications for ocean oxygen availability
	Moreno A.R.; Garcia C.A.; Larkin A.A.; Lee J.A.; Wang W.-L.; Moore J.K.; Primeau F.W.; Martiny A.C.
发表日期	2020
ISSN	0027-8424
起始页码	22866
结束页码	22872
卷号	117 期号:37
英文摘要	Climate-driven depletion of ocean oxygen strongly impacts the global cycles of carbon and nutrients as well as the survival of many animal species. One of the main uncertainties in predicting changes to marine oxygen levels is the regulation of the biological respiration demand associated with the biological pump. Derived from the Redfield ratio, the molar ratio of oxygen to organic carbon consumed during respiration (i.e., the respiration quotient, r_O2: C) is consistently assumed constant but rarely, if ever, measured. Using a prognostic Earth system model, we show that a 0.1 increase in the respiration quotient from 1.0 leads to a 2.3% decline in global oxygen, a large expansion of low-oxygen zones, additional water column denitrification of 38 Tg N/y, and the loss of fixed nitrogen and carbon production in the ocean. We then present direct chemical measurements of r_O2: C using a Pacific Ocean meridional transect crossing all major surface biome types. The observed r_O2: C has a positive correlation with temperature, and regional mean values differ significantly from Redfield proportions. Finally, an independent global inverse model analysis constrained with nutrients, oxygen, and carbon concentrations supports a positive temperature dependence of r_O2: C in exported organic matter. We provide evidence against the common assumption of a static biological link between the respiration of organic carbon and the consumption of oxygen. Furthermore, the model simulations suggest that a changing respiration quotient will impact multiple biogeochemical cycles and that future warming can lead to more intense deoxygenation than previously anticipated. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	CESM; Elemental stoichiometry; Inverse modeling; Photosynthetic quotient; Redfield ratio
语种	英语
scopus关键词	carbon; organic matter; oxygen; water; Article; biogeochemical cycle; biome; chemical analysis; concentration (parameter); denitrification; deoxygenation; environment; environmental temperature; latitude; nitrogen fixation; nutrient; oxygen consumption; priority journal; respiratory quotient; sea; warming
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160805
作者单位	Moreno, A.R., Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, United States; Garcia, C.A., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Larkin, A.A., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Lee, J.A., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Wang, W.-L., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Moore, J.K., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Primeau, F.W., Department of Earth System Science, University of California, Irvine, CA 92697, United States; Martiny, A.C., Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, United States, Department of Earth System Science, University of California, Irvine, CA 92697, United States
推荐引用方式 GB/T 7714	Moreno A.R.,Garcia C.A.,Larkin A.A.,et al. Latitudinal gradient in the respiration quotient and the implications for ocean oxygen availability[J],2020,117(37).
APA	Moreno A.R..,Garcia C.A..,Larkin A.A..,Lee J.A..,Wang W.-L..,...&Martiny A.C..(2020).Latitudinal gradient in the respiration quotient and the implications for ocean oxygen availability.Proceedings of the National Academy of Sciences of the United States of America,117(37).
MLA	Moreno A.R.,et al."Latitudinal gradient in the respiration quotient and the implications for ocean oxygen availability".Proceedings of the National Academy of Sciences of the United States of America 117.37(2020).