| DOI: | 10.1002/grl.50275
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| 论文题名: | Deep-sea nutrient loss inferred from the marine dissolved N2/Ar ratio |
| 作者: | Hamme R.C.; Emerson S.R.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9205
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| EISSN: | 1944-8936
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| 出版年: | 2013
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| 卷: | 40, 期:6 | | 起始页码: | 1149
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| 结束页码: | 1153
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| 语种: | 英语
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| 英文关键词: | denitrification
; dissolved gases
; nitrogen cycle
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| Scopus关键词: | Denitrification rate
; Detection limits
; Dissolved gas
; Nitrogen cycles
; North Atlantic
; Nutrient loss
; Oceanic nitrogen
; Southern ocean
; Denitrification
; Dissolution
; Mixing
; Oceanography
; Nitrogen
; argon
; bioavailability
; deep sea
; denitrification
; dissolved gas
; marine environment
; nitrogen cycle
; nitrogen fixation
; nutrient availability
; Cascadia Basin
; Pacific Ocean
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| 英文摘要: | Some estimates of the budget of bioavailable nitrogen (fixed-N) suggest that the oceanic nitrogen cycle is grossly out of balance. We use observations of dissolved N2/Ar ratios along abyssal flow paths in the ocean to investigate fixed-N loss by benthic denitrification, one of the largest uncertainties. Dissolved N2/Ar in the deep-sea increases from the North Atlantic to the North Pacific. At depths >3500 m, this can be explained by the mixing of low N2/Ar source waters from the North Atlantic with high N2/Ar source waters from the Southern Ocean. Benthic denitrification in sediments bathed by these abyssal waters is below the detection limit. However, measureable increases in N2/Ar at depths of 2000-3000 m between the subtropical and subarctic North Pacific, regions that share the same source water, must be caused by benthic denitrification. The Cascadia Basin, with high denitrification rates and connection to the open North Pacific, is a likely source. Key Points Dissolved N2/Ar in the deep-sea can act as a tracer of benthic denitrification Source water mixing controls N2/Ar patterns in the deepest waters Cascadia Basin denitrification causes N2/Ar increases within the North Pacific. ©2013 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876948105&doi=10.1002%2fgrl.50275&partnerID=40&md5=3f5f4d7bcf90671570ae75edaa759b38
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6469
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| Appears in Collections: | 气候减缓与适应
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作者单位: | School of Earth and Ocean Sciences, University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
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| Recommended Citation: | |
Hamme R.C.,Emerson S.R.. Deep-sea nutrient loss inferred from the marine dissolved N2/Ar ratio[J]. Geophysical Research Letters,2013-01-01,40(6).
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