气候变化领域集成服务门户(CCPortal): Assessing Marine Nitrogen Cycle Rates and Process Sensitivities With a Global 3-D Inverse Model

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DOI	10.1029/2018GB006088
	Assessing Marine Nitrogen Cycle Rates and Process Sensitivities With a Global 3-D Inverse Model
	Martin T.S.; Primeau F.; Casciotti K.L.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1026
结束页码	1047
卷号	33 期号:8
英文摘要	We present results from a global inverse marine nitrogen (N) cycle model that include nitrate (NO3 −) and nitrite (NO2 −) concentrations and their N isotopic compositions as constraints on N cycle process rates in marine oxygen deficient zones (ODZs). NO2 − is an important intermediate in the N cycle, particularly in ODZs where it is a substrate in the N loss processes, denitrification, and anammox. Similar to earlier work, our model yields a total water column N loss rate of 61 ± 10 Tg N/year. However, by including NO2 − and its N isotopic composition, we are able to assess the relative contributions of denitrification and anammox to N loss and examine some of the potential drivers of that balance. We find that anammox contributes 60% of global water column N loss, dominating N loss along the edges of ODZs, while denitrification is more important in the anoxic ODZ cores. The decoupling of anammox and denitrification is supported by NO2 − oxidation, which co-occurs with NO3 − reduction and anammox in ODZs. High rates of NO2 − oxidation (up to 400 nM/day), which are tightly coupled to heterotrophic NO3 − reduction, are required to match NO3 − and NO2 − concentration and isotope observations in marine ODZs. Lowering the rate of NO2 − oxidation in ODZs by adjusting O2-sensitive parameters results in higher rates of water column N loss, highlighting the role of NO2 − oxidation in maintaining the marine fixed N inventory. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	inverse model; nitrite; nitrogen; oxygen deficient zones; stable isotopes
语种	英语
scopus关键词	biogeography; data inversion; marine environment; nitrite; nitrogen cycle; oxygen minimum layer; sensitivity analysis; stable isotope; three-dimensional modeling
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/129724
作者单位	Department of Earth System Science, Stanford University, Stanford, CA, United States; Department of Earth System Science, University of California, Irvine, CA, United States
推荐引用方式 GB/T 7714	Martin T.S.,Primeau F.,Casciotti K.L.. Assessing Marine Nitrogen Cycle Rates and Process Sensitivities With a Global 3-D Inverse Model[J],2019,33(8).
APA	Martin T.S.,Primeau F.,&Casciotti K.L..(2019).Assessing Marine Nitrogen Cycle Rates and Process Sensitivities With a Global 3-D Inverse Model.Global Biogeochemical Cycles,33(8).
MLA	Martin T.S.,et al."Assessing Marine Nitrogen Cycle Rates and Process Sensitivities With a Global 3-D Inverse Model".Global Biogeochemical Cycles 33.8(2019).