Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves

Contrasts in suspended particle composition

Tommaso Tesi, Marc C. Geibel, Christof Pearce, Elena Panova, Jorien E. Vonk, Emma Karlsson, A. Joan Salvado, Martin Krusä, Lisa Bröder, Christoph Humborg, Igor Semiletov, Örjan Gustafsson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Recent Arctic studies suggest that sea ice decline and permafrost thawing will affect phytoplankton dynamics and stimulate heterotrophic communities. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we investigate the chemical signature of the plankton-dominated fraction of particulate organic matter (POM) collected along the Siberian Shelf. POM (> 10μm) samples were analysed using molecular biomarkers (CuO oxidation and IP25) and dual-carbon isotopes (δ13C and Δ14C). In addition, surface water chemical properties were integrated with the POM (< 10μm) dataset to understand the link between plankton composition and environmental conditions. ä13C and 114C exhibited a large variability in the POM (< 10μm) distribution while the content of terrestrial biomarkers in the POM was negligible. In the Laptev Sea (LS), (δ13C and Δ14C) of POM (< 10μm) suggested a heterotrophic environment in which dissolved organic carbon (DOC) from the Lena River was the primary source of metabolisable carbon. Within the Lena plume, terrestrial DOC probably became part of the food web via bacteria uptake and subsequently transferred to relatively other heterotrophic communities (e.g. dinoflagellates). Moving eastwards toward the sea-ice-dominated East Siberian Sea (ESS), the system became progressively more autotrophic. Comparison between δ13C of POM (< 10μm) samples and CO2aq concentrations revealed that the carbon isotope fractionation increased moving towards the easternmost and most productive stations. In a warming scenario characterised by enhanced terrestrial DOC release (thawing permafrost) and progressive sea ice decline, heterotrophic conditions might persist in the LS while the nutrient-rich Pacific inflow will likely stimulate greater primary productivity in the ESS. The contrasting trophic conditions will result in a sharp gradient in δ13C between the LS and ESS, similar to what is documented in our semi-synoptic study.

Original languageEnglish
Pages (from-to)735-748
Number of pages14
JournalOcean Science
Volume13
Issue number5
DOIs
Publication statusPublished - 18 Sep 2017

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particulate organic matter
plankton
geochemistry
carbon
dissolved organic carbon
sea ice
thawing
permafrost
carbon isotope
biomarker
warming
trophic conditions
particle
dinoflagellate
food web
sea
chemical property
inflow
fractionation
plume

ASJC Scopus subject areas

  • Oceanography
  • Palaeontology

Cite this

Tesi, T., Geibel, M. C., Pearce, C., Panova, E., Vonk, J. E., Karlsson, E., ... Gustafsson, Ö. (2017). Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: Contrasts in suspended particle composition. Ocean Science, 13(5), 735-748. https://doi.org/10.5194/os-13-735-2017

Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves : Contrasts in suspended particle composition. / Tesi, Tommaso; Geibel, Marc C.; Pearce, Christof; Panova, Elena; Vonk, Jorien E.; Karlsson, Emma; Salvado, A. Joan; Krusä, Martin; Bröder, Lisa; Humborg, Christoph; Semiletov, Igor; Gustafsson, Örjan.

In: Ocean Science, Vol. 13, No. 5, 18.09.2017, p. 735-748.

Research output: Contribution to journalArticle

Tesi, T, Geibel, MC, Pearce, C, Panova, E, Vonk, JE, Karlsson, E, Salvado, AJ, Krusä, M, Bröder, L, Humborg, C, Semiletov, I & Gustafsson, Ö 2017, 'Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: Contrasts in suspended particle composition', Ocean Science, vol. 13, no. 5, pp. 735-748. https://doi.org/10.5194/os-13-735-2017
Tesi, Tommaso ; Geibel, Marc C. ; Pearce, Christof ; Panova, Elena ; Vonk, Jorien E. ; Karlsson, Emma ; Salvado, A. Joan ; Krusä, Martin ; Bröder, Lisa ; Humborg, Christoph ; Semiletov, Igor ; Gustafsson, Örjan. / Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves : Contrasts in suspended particle composition. In: Ocean Science. 2017 ; Vol. 13, No. 5. pp. 735-748.
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