DOI: 10.1002/2015GB005187
Scopus记录号: 2-s2.0-84955381078
论文题名: Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica
作者: Buchwald C ; , Santoro A ; E ; , Stanley R ; H ; R ; , Casciotti K ; L
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 12 起始页码: 2061
结束页码: 2081
语种: 英语
英文关键词: nitrate
; nitrite
; stable isotopes
Scopus关键词: bacterium
; bioavailability
; biotransformation
; microbial activity
; nitrate
; nitrite
; nitrogen cycle
; nitrogen isotope
; oxygen isotope
; oxygen minimum layer
; stable isotope
; Costa Rica
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Nitrite is a central intermediate in the marine nitrogen cycle and represents a critical juncture where nitrogen can be reduced to the less bioavailable N2 gas or oxidized to nitrate and retained in a more bioavailable form. We present an analysis of rates of microbial nitrogen transformations in the oxygen deficient zone (ODZ) within the eastern tropical North Pacific Ocean (ETNP). We determined rates using a novel one-dimensional model using the distribution of nitrite and nitrate concentrations, along with their natural abundance nitrogen (N) and oxygen (O) isotope profiles. We predict rate profiles for nitrate reduction, nitrite reduction, and nitrite oxidation throughout the ODZ, as well as the contributions of anammox to nitrite reduction and nitrite oxidation. Nitrate reduction occurs at a maximum rate of 25 nM d-1 at the top of the ODZ, at the same depth as the maximum rate of nitrite reduction, 15 nM d-1. Nitrite oxidation occurs at maximum rates of 10 nM d-1 above the secondary nitrite maximum, but also in the secondary nitrite maximum, within the ODZ. Anammox contributes to nitrite oxidation within the ODZ but cannot account for all of it. Nitrite oxidation within the ODZ that is not through anammox is also supported by microbial gene abundance profiles. Our results suggest the presence of nitrite oxidation within the ETNP ODZ, with implications for the distribution and physiology of marine nitrite-oxidizing bacteria, and for total nitrogen loss in the largest marine ODZ. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77899
Appears in Collections: 气候变化事实与影响
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作者单位: Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Horn Point Laboratory, University of Maryland, Center for Environmental Science, Cambridge, MD, United States; Now at Wellesley College, Wellesley, MD, United States; Stanford University, Stanford, CA, United States
Recommended Citation:
Buchwald C,, Santoro A,E,et al. Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica[J]. Global Biogeochemical Cycles,2015-01-01,29(12)