DOI: 10.1002/2016GB005593
Scopus记录号: 2-s2.0-85018929848
论文题名: Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope
作者: Thibodeau B ; , Bauch D ; , Voss M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 5 起始页码: 836
结束页码: 849
语种: 英语
英文关键词: anthropogenic impact
; Arctic
; carbon
; climate change
; nitrogen
; primary productivity
Scopus关键词: anthropogenic effect
; brine
; carbon
; climate change
; coastal zone
; dissolved organic nitrogen
; environmental fate
; mixing
; nitrate
; nitrogen isotope
; permafrost
; primary production
; remineralization
; river discharge
; sea ice
; thawing
; Arctic
; Arctic Ocean
; Eurasia
; Laptev Sea
英文摘要: Primary productivity is limited by the availability of nitrogen (N) in most of the coastal Arctic, as a large portion of N is released by the spring freshet and completely consumed during the following summer. Thus, understanding the fate of riverine nitrogen is critical to identify the link between dissolved nitrogen dynamic and coastal primary productivity to foresee upcoming changes in the Arctic seas, such as increase riverine discharge and permafrost thaw. Here we provide a field-based study of nitrogen dynamic over the Laptev Sea shelf based on isotope geochemistry. We demonstrate that while most of the nitrate found under the surface freshwater layer is of remineralized origin, some of the nitrate originates from atmospheric input and was probably transported at depth by the mixing of brine-enriched denser water during sea ice formation. Moreover, our results suggest that riverine dissolved organic nitrogen (DON) represents up to 6 times the total riverine release of nitrate and that about 62 to 76% of the DON is removed within the shelf waters. This is a crucial information regarding the near-future impact of climate change on primary productivity in the Eurasian coastal Arctic. ©2017. 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/77745
Appears in Collections: 气候变化事实与影响
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作者单位: Academy of Science, Humanities and Literature, Mainz, Germany; GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany; Now at Department of Earth Sciences and Swire Institute of Marine Science, University of Hong Kong, Hong Kong; Leibniz Institute for Baltic Sea Research, Rostock, Germany
Recommended Citation:
Thibodeau B,, Bauch D,, Voss M. Nitrogen dynamic in Eurasian coastal Arctic ecosystem: Insight from nitrogen isotope[J]. Global Biogeochemical Cycles,2017-01-01,31(5)