umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
  • rtf
Riverine particulate C and N generated at the permafrost thaw front: case study of western Siberian rivers across a 1700km latitudinal transect
Show others and affiliations
2018 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 15, no 22, p. 6867-6884Article in journal (Refereed) Published
Abstract [en]

In contrast to numerous studies on the dynamics of dissolved (< 0.45 mu m) elements in permafrost-affected highlatitude rivers, very little is known of the behavior of river suspended (> 0.45 mu m) matter (RSM) in these regions. In order to test the effect of climate, permafrost and physiogeographical landscape parameters (bogs, forest and lake coverage of the watershed) on RSM and particulate C, N and P concentrations in river water, we sampled 33 small and medium-sized rivers (10-100 000 km(2) watershed) along a 1700 km N-S transect including both permafrost-affected and permafrost-free zones of the Western Siberian Lowland (WSL). The concentrations of C and N in RSM decreased with the increase in river watershed size, illustrating (i) the importance of organic debris in small rivers which drain peatlands and (ii) the role of mineral matter from bank abrasion in larger rivers. The presence of lakes in the watershed increased C and N but decreased P concentrations in the RSM. The C V N ratio in the RSM reflected the source from the deep soil horizon rather than surface soil horizon, similar to that of other Arctic rivers. This suggests the export of peat and mineral particles through suprapermafrost flow occurring at the base of the active layer. There was a maximum of both particulate C and N concentrations and export fluxes at the beginning of permafrost appearance, in the sporadic and discontinuous zone (62-64 degrees N). This presumably reflected the organic matter mobilization from newly thawed organic horizons in soils at the active latitudinal thawing front. The results suggest that a northward shift of permafrost boundaries and an increase in active layer thickness may increase particulate C and N export by WSL rivers to the Arctic Ocean by a factor of 2, while P export may remain unchanged. In contrast, within a long-term climate warming scenario, the disappearance of permafrost in the north, the drainage of lakes and transformation of bogs to forest may decrease C and N concentrations in RSM by 2 to 3 times.

Place, publisher, year, edition, pages
Nicolaus Copernicus University Press, 2018. Vol. 15, no 22, p. 6867-6884
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:umu:diva-154053DOI: 10.5194/bg-15-6867-2018ISI: 000450427400001OAI: oai:DiVA.org:umu-154053DiVA, id: diva2:1272511
Funder
Swedish Research Council, 325-2014-6898Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2018-12-19Bibliographically approved

Open Access in DiVA

fulltext(18296 kB)75 downloads
File information
File name FULLTEXT01.pdfFile size 18296 kBChecksum SHA-512
5a14959741190f1f0978de0ef41a3b23c8bdf6e6c9eae5fcee39f962959f77f8902442c3adae955cb5d9db598b116dc848df7aea79c1c6837a4c39cb8ca66078
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Karlsson, Jan

Search in DiVA

By author/editor
Karlsson, JanPokrovsky, Oleg S.
By organisation
Department of Ecology and Environmental Sciences
In the same journal
Biogeosciences
Geosciences, Multidisciplinary

Search outside of DiVA

GoogleGoogle Scholar
Total: 75 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 235 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
  • rtf