globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005351
Scopus记录号: 2-s2.0-84969751430
论文题名:
Particulate organic carbon and nitrogen export from major Arctic rivers
作者: McClelland J; W; , Holmes R; M; , Peterson B; J; , Raymond P; A; , Striegl R; G; , Zhulidov A; V; , Zimov S; A; , Zimov N; , Tank S; E; , Spencer R; G; M; , Staples R; , Gurtovaya T; Y; , Griffin C; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:5
起始页码: 629
结束页码: 643
语种: 英语
英文关键词: Arctic ; carbon ; export ; nitrogen ; river ; watershed
Scopus关键词: biogeochemical cycle ; carbon flux ; concentration (composition) ; data set ; dissolved organic carbon ; global warming ; nitrogen ; particulate organic carbon ; particulate organic nitrogen ; radiocarbon dating ; river discharge ; twenty first century ; watershed ; Arctic
英文摘要: Northern rivers connect a land area of approximately 20.5 million km2 to the Arctic Ocean and surrounding seas. These rivers account for ~10% of global river discharge and transport massive quantities of dissolved and particulate materials that reflect watershed sources and impact biogeochemical cycling in the ocean. In this paper, multiyear data sets from a coordinated sampling program are used to characterize particulate organic carbon (POC) and particulate nitrogen (PN) export from the six largest rivers within the pan-Arctic watershed (Yenisey, Lena, Ob', Mackenzie, Yukon, Kolyma). Together, these rivers export an average of 3055 × 109 g of POC and 368 × 109 g of PN each year. Scaled up to the pan-Arctic watershed as a whole, fluvial export estimates increase to 5767 × 109 g and 695 × 109 g of POC and PN per year, respectively. POC export is substantially lower than dissolved organic carbon export by these rivers, whereas PN export is roughly equal to dissolved nitrogen export. Seasonal patterns in concentrations and source/composition indicators (C:N, δ13C, Δ14C, δ15N) are broadly similar among rivers, but distinct regional differences are also evident. For example, average radiocarbon ages of POC range from ~2000 (Ob') to ~5500 (Mackenzie) years before present. Rapid changes within the Arctic system as a consequence of global warming make it challenging to establish a contemporary baseline of fluvial export, but the results presented in this paper capture variability and quantify average conditions for nearly a decade at the beginning of the 21st century. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77854
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; Woods Hole Research Center, Falmouth, MA, United States; The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, United States; School of Forestry and Environmental Studies, Yale University, New Haven, CT, United States; United States Geological Survey, Boulder, CO, United States; South Russia Centre for Preparation and Implementation of International Projects, Rostov-on-Don, Russian Federation; Northeast Science Station, Cherskiy, Russian Federation; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Environment and Natural Resources, Government of the Northwest Territories, Yellowknife, NT, Canada

Recommended Citation:
McClelland J,W,, Holmes R,et al. Particulate organic carbon and nitrogen export from major Arctic rivers[J]. Global Biogeochemical Cycles,2016-01-01,30(5)
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