DOI: 10.1038/ngeo1745
论文题名: Isotopic ratios of nitrite as tracers of the sources and age of oceanic nitrite
作者: Buchwald C. ; Casciotti K.L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 4 起始页码: 308
结束页码: 313
语种: 英语
Scopus关键词: ammonia
; bioaccumulation
; concentration (composition)
; isotopic ratio
; nitrite
; nitrogen cycle
; oxidation
; oxygen
; oxygen isotope
; Arabian Sea
; Indian Ocean
英文摘要: Nitrite is a central intermediate in the marine nitrogen cycle, and is generally found at low concentrations in the ocean. However, nitrite accumulates at the base of the sunlit surface ocean. The origin of this ubiquitous feature, known as the primary nitrite maximum, is debated and has been difficult to resolve through short-term isotope tracer incubations. Here, we use measurements of the dual isotopic composition of nitrite to evaluate the sources, sinks and average rates of nitrite turnover in the primary nitrite maximum in the Arabian Sea. We determined the rate of abiotic oxygen isotope exchange between nitrite and water, as well as equilibrium isotope effects, under a variety of conditions in a series of laboratory experiments. We used these data to model nitrite isotope data from several sites in the Arabian Sea. The results suggest that ammonia oxidation is the primary source of nitrite at most sites. Steady-state nitrite turnover times of 33-178 days correspond to ammonia oxidation rates of 9-30 nM per day at these sites. We suggest that a similar approach could be used to determine the rates of nitrite turnover in other environments, including the secondary nitrite maximum in low-oxygen regions. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106827
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution Joint Program in Chemical Oceanography, Woods Hole, MA 02543, United States; Department of Environmental Earth System Science, Stanford University, Stanford, CA 94305, United States
Recommended Citation:
Buchwald C.,Casciotti K.L.. Isotopic ratios of nitrite as tracers of the sources and age of oceanic nitrite[J]. Nature Geoscience,2013-01-01,6(4)