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Spatial variation in concentration and sources of organic carbon in the Lena River, Siberia
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2017 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953Article in journal (Refereed) Published
Abstract [en]

Global warming in permafrost areas is expected to change fluxes of riverine organic carbon (OC) to the Arctic Ocean. Here OC concentrations, stable carbon isotope signatures (δ13C), and carbon-nitrogen ratios (C/N) are presented from 22 sampling stations in the Lena River and 40 of its tributaries. Sampling was conducted during two expeditions: the first in July 2012 in the south and southeastern region and the second in June 2013 in the northern region of the Lena basin. The data showed significant spatial differences in concentrations and major sources of OC. Mean subcatchment slopes were correlated with OC concentrations, implying that mountainous areas in general had lower concentrations than lowland areas. δ13C and C/N data from tributaries originating in mountainous areas indicated that both dissolved and particulate OC (DOC and POC) were mainly derived from soil organic matter (SOM). In contrast, tributaries originating in lowland areas had larger contributions from fresh vegetation to DOC, while aquatically produced OC was the major source of POC. We suggest that these differences in dominant sources indicated differences in dominant flow pathways. Tributaries with larger influence of fresh vegetation probably had surficial flow pathways, while tributaries with more SOM influence had deeper water flow pathways. Thus, the future export of OC to the Arctic Ocean will likely be controlled by changes in spatial patterns in hydroclimatology and the depth of the active layers influencing the dominant water flow pathways in Arctic river basins.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Carbon cycling, Organic and biogenic geochemistry, Chemistry of fresh water, Lena River, organic carbon, stable carbon isotopes
National Category
Natural Sciences
Research subject
SWEDARCTIC 2012, Lena River Study 2012; SWEDARCTIC 2013, Lena River Study 2013
Identifiers
URN: urn:nbn:se:polar:diva-3793DOI: 10.1002/2017JG003858OAI: oai:DiVA.org:polar-3793DiVA: diva2:1136112
Note

2017JG003858

Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-08-25

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Publisher's full texthttp://dx.doi.org/10.1002/2017JG003858
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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