DOI: 10.1002/gbc.20070
Scopus记录号: 2-s2.0-84883154832
论文题名: Water column denitrification rates in the oxygen minimum layer of the Pacific Ocean along 32°S
作者: Kim I ; -N ; , Min D ; -H ; , Macdonald A ; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 816
结束页码: 827
语种: 英语
英文关键词: eOMP analysis
; N*
; Oxygen minimum layer
; South Pacific Ocean
; Water column denitrification
Scopus关键词: Eastern tropical pacific
; eOMP analysis
; Marine nitrogen cycle
; Multiparameter analysis
; Oxygen minimum layer
; South pacific oceans
; Transit-time distributions
; Water columns
; Budget control
; Estimation
; Nitrogen
; Oceanography
; Oxygen
; Regression analysis
; Denitrification
; denitrification
; nitrogen cycle
; nutrient budget
; open ocean
; oxygen minimum layer
; water column
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: To date, estimates of water column denitrification rates in global- and basin-scale nitrogen budgets do not include any values obtained in the open ocean outside the oxygen minimum zones (OMZs). The high-quality, 32°S Pacific repeat hydrographic surveys conducted in 1992, 2003, and 2010 offer an opportunity to estimate denitrification rates on basin scales in the open ocean away from the Eastern Tropical Pacific (ETP) oxygen minimum zones. Here, extended optimum multiparameter analysis and N* are used to estimate water column denitrification (ΔNdeni) in the oxygen minimum layer (OML; 1100-2000 dbar). Water column denitrification rates for 2003 and 2010 are estimated from the regression analysis using ΔNdeni and transit time distribution ages based on CFC12. Estimated mean denitrification rates in the OML at 32°S range from 3.1 to 7.5 μmol N m-3 yr -1 (=2.6-6.8 mmol N m-2 yr-1 with a thickness of 900 m). The OML denitrification rates are 2-3 orders of magnitudes lower than those estimated in the OMZs of ETP. However, their significance to Pacific nitrogen budget needs to be investigated in the future. Although uncertainties remain, our results may ultimately contribute to an improved understanding of marine nitrogen cycles. Key Points We estimated water column denitrification in the P06 (~32{degree sign}S) OML.We showed spatial variation of the water column denitrification rates.The OML denitrification may contribute to the Pacific nitrogen budget. ©2013. 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/77586
Appears in Collections: 气候变化事实与影响
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作者单位: Marine Science Institute, University of Texas at Austin, Port Aransas, TX, United States; School of Environmental Science and Engineering, POSTECH, Pohang 790-784, South Korea; WHOI, Woods Hole, MA, United States
Recommended Citation:
Kim I,-N,, Min D,et al. Water column denitrification rates in the oxygen minimum layer of the Pacific Ocean along 32°S[J]. Global Biogeochemical Cycles,2013-01-01,27(3)