Contrasting lipid biomarker composition of terrestial organic matter exported from across the Eurasian Arctic by the five great Russian Arctic rivers

Bart E. van Dongen, Igor Semiletov, John W.H. Weijers, Örjan Gustafsson

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Surface sediments outside the great Russian Arctic rivers (GRARs; Ob, Yenisey, Lena, Indigirka, and Kolyma) were investigated for their lipid biomarker composition to elucidate compositional distinctions of the exported organic matter (OM) across this continent-scale climosequence of the Siberian Arctic. The lipid biomarker composition is dominantly terrestrial (high molecular weight (HMW) n-alkanols, n-alkanoic acids, n-alkanes; branched glycerol dialkyl glycerol tetraethers (GDGTs), β-sitosterol, other sterols, and triterpenoids) with only minor marine contributions (e.g., the ratio of terrigenous-to-aquatic n-alkanes was 17-80, the TOC/TN ratio was 10-16, and the branched and isoprenoid tetraether (BIT) index >0.88). There is a large contribution of C23 and C25 homologues relative to other long-chained n-alkanes, suggesting substanial contribution of probably Sphagnum-derived OM. The C23 and C25 contribution decreases eastward, signaling either a decrease in the potential contribution of Sphagnum or a shift within the n-alkane distribution of Sphagnum species or increased aeolian input, due to more and conditions in the east. Other distinctions in molecular OM composition across the climosequence include increased concentrations of both HMW n-alkanoic acids and β-sitosterol relative to HMW n-alkanes in the eastern sediments. This suggests that the OM exported by the eastern GRARs is, despite their higher bulk radiocarbon ages, less degraded, which is consistent with increasing permafrost and a shorter annual thaw period in eastern Siberia. Taken together, this benchmark study of the current composition of terrestrially exported OM suggests distinguishing continent-scale trends in molecular composition of the OM across the west-east set of GRARs, which reflects both differences in vegetation and climate. If the climate in the eastern Russian Arctic region becomes more like the current state in the western part, these results would predict a greater degree of decomposition of the old terrestrial OM released by the eastern GRARs and thus greater remineralization and release as CO2 and methane.

Original languageEnglish
Article numberGB1011
JournalGlobal Biogeochemical Cycles
Volume22
Issue number1
DOIs
Publication statusPublished - Mar 2008
Externally publishedYes

Fingerprint

Biomarkers
Biological materials
biomarker
Alkanes
Rivers
lipid
alkane
Lipids
organic matter
Chemical analysis
river
Molecular weight
Carboxylic acids
Glycerol
Sediments
Permafrost
remineralization
isoprenoid
sterol
acid

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Environmental Science(all)
  • Atmospheric Science

Cite this

Contrasting lipid biomarker composition of terrestial organic matter exported from across the Eurasian Arctic by the five great Russian Arctic rivers. / van Dongen, Bart E.; Semiletov, Igor; Weijers, John W.H.; Gustafsson, Örjan.

In: Global Biogeochemical Cycles, Vol. 22, No. 1, GB1011, 03.2008.

Research output: Contribution to journalArticle

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