globalchange  > 气候变化与战略
DOI: 10.1029/2018GB005948
论文题名:
Isotopic Constraints on Nitrogen Transformation Rates in the Deep Sedimentary Marine Biosphere
作者: Buchwald C.; Homola K.; Spivack A.J.; Estes E.R.; Murray R.W.; Wankel S.D.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期:11
语种: 英语
英文关键词: biosphere ; gyre ; isotopic analysis ; marine sediment ; microbial activity ; microbial community ; nitrogen ; nitrogen cycle ; oligotrophic environment ; one-dimensional modeling ; oxidation ; reduction ; transformation ; Atlantic Ocean ; Atlantic Ocean (North)
中文摘要: Little is known about the nature of microbial community activity contributing to the cycling of nitrogen in organic-poor sediments underlying the expansive oligotrophic ocean gyres. Here we use pore water concentrations and stable N and O isotope measurements of nitrate and nitrite to constrain rates of nitrogen cycling processes over a 34-m profile from the deep North Atlantic spanning fully oxic to anoxic conditions. Using a 1-D reaction-diffusion model to predict the distribution of nitrogen cycling rates, results converge on two distinct scenarios: (1) an exceptionally high degree of coupling between nitrite oxidation and nitrate reduction near the top of the anoxic zone or (2) an unusually large N isotope effect (~60‰) for nitrate reduction that is decoupled from the corresponding O isotope effect, which is possibly explained by enzyme-level interconversion between nitrite and nitrate. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160178
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作者单位: Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Oceanography, Dalhousie University, Halifax, NS, Canada; School of Oceanography, University of Rhode Island, Narragansett, RI, United States; Earth and Environment, Boston University, Boston, MA, United States

Recommended Citation:
Buchwald C.,Homola K.,Spivack A.J.,et al. Isotopic Constraints on Nitrogen Transformation Rates in the Deep Sedimentary Marine Biosphere[J]. Global Biogeochemical Cycles,2018-01-01,32(11)
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