globalchange  > 气候减缓与适应
DOI: 10.1002/2017JG004337
Scopus记录号: 2-s2.0-85044284874
论文题名:
Flux and Seasonality of Dissolved Organic Matter From the Northern Dvina (Severnaya Dvina) River, Russia
作者: Johnston S.E.; Shorina N.; Bulygina E.; Vorobjeva T.; Chupakova A.; Klimov S.I.; Kellerman A.M.; Guillemette F.; Shiklomanov A.; Podgorski D.C.; Spencer R.G.M.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:3
起始页码: 1041
结束页码: 1056
语种: 英语
英文关键词: Arctic Ocean ; Arctic river ; dissolved organic matter ; lignin ; residence time ; seasonality
英文摘要: Pan-Arctic riverine dissolved organic carbon (DOC) fluxes represent a major transfer of carbon from land-to-ocean, and past scaling estimates have been predominantly derived from the six major Arctic rivers. However, smaller watersheds are constrained to northern high-latitude regions and, particularly with respect to the Eurasian Arctic, have received little attention. In this study, we evaluated the concentration of DOC and composition of dissolved organic matter (DOM) via optical parameters, biomarkers (lignin phenols), and ultrahigh resolution mass spectrometry in the Northern Dvina River (a midsized high-latitude constrained river). Elevated DOC, lignin concentrations, and aromatic DOM indicators were observed throughout the year in comparison to the major Arctic rivers with seasonality exhibiting a clear spring freshet and also some years a secondary pulse in the autumn concurrent with the onset of freezing. Chromophoric DOM absorbance at a350 was strongly correlated to DOC and lignin across the hydrograph; however, the relationships did not fit previous models derived from the six major Arctic rivers. Updated DOC and lignin fluxes were derived for the pan-Arctic watershed by scaling from the Northern Dvina resulting in increased DOC and lignin fluxes (50 Tg yr−1 and 216 Gg yr−1, respectively) compared to past estimates. This leads to a reduction in the residence time for terrestrial carbon in the Arctic Ocean (0.5 to 1.8 years). These findings suggest that constrained northern high-latitude rivers are underrepresented in models of fluxes based from the six largest Arctic rivers with important ramifications for the export and fate of terrestrial carbon in the Arctic Ocean. ©2018. 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/114377
Appears in Collections:气候减缓与适应

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作者单位: National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Laboratory of Freshwater and Marine Ecosystems, Federal Center for Integrated Arctic Research RAS (RAS FCI Arctic), Arkhangelsk, Russian Federation; Northern (Arctic) Federal University named after M.V. Lomonosov, Arkhangelsk, Russian Federation; Louisiana Universities Marine Consortium, Chauvin, LA, United States; Now at Research Center for Watershed - Aquatic Ecosystem Interactions (RIVE), University of Quebec at Trois-Rivieres, Trois-Rivieres, QC, Canada; Water Systems Analysis Group, University of New Hampshire, Durham, NH, United States; Now at Pontchartrain Institute for Environmental Sciences, Department of Chemistry, University of New Orleans, New Orleans, LA, United States

Recommended Citation:
Johnston S.E.,Shorina N.,Bulygina E.,et al. Flux and Seasonality of Dissolved Organic Matter From the Northern Dvina (Severnaya Dvina) River, Russia[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(3)
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