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Other research product . Other ORP type . Collection . 2016

Dissolved organic carbon in sediments of the central Arctic Ocean collected during POLARSTERN cruise ARK-XXVII/3 from August-September 2012, supplement to: Rossel, Pamela E; Bienhold, Christina; Boetius, Antje; Dittmar, Thorsten (2016): Dissolved organic matter in pore water of Arctic Ocean sediments: Environmental influence on molecular composition. Organic Geochemistry, 97, 41-52

Rossel, Pamela E; Bienhold, Christina; Boetius, Antje; Dittmar, Thorsten;
Open Access
English
Published: 01 Jan 2016
Publisher: PANGAEA - Data Publisher for Earth & Environmental Science
Abstract

Marine organic matter (OM) sinks from surface waters to the seafloor via the biological pump. Benthic communities, which use this sedimented OM as energy and carbon source, produce dissolved organic matter (DOM) in the process of remineralization, enriching the sediment porewater with fresh DOM compounds. We hypothesized that in the oligotrophic deep Arctic basin the molecular signal of freshly deposited primary produced OM is restricted to the surface sediment pore waters which should differ from bottom water and deeper sediment pore water in DOM composition. This study focused on: 1) the molecular composition of the DOM in sediment pore waters of the deep Eurasian Arctic basins, 2) whether the signal of marine vs. terrigenous DOM is represented by different compounds preserved in the sediment pore waters and 3) whether there is any relation between Arctic Ocean ice cover and DOM composition. Molecular data, obtained via 15 Tesla Fourier transform ion cyclotron resonance mass spectrometer, were correlated with environmental parameters by partial least square analysis. The fresher marine detrital OM signal from surface waters was limited to pore waters from < 5 cm sediment depth. The productive ice margin stations showed higher abundances of peptides, unsaturated aliphatics and saturated fatty acids formulae, indicative of fresh OM/pigments deposition, compared to northernmost stations which had stronger aromatic signals. This study contributes to the understanding of the coupling between the Arctic Ocean productivity and its depositional regime, and how it will be altered in response to sea ice retreat and increasing river runoff. This is a contribution to the European Research Council Advanced Investigator Grant 294757 to Antje Boetius.

Subjects

Assessment of bacterial life and matter cycling in deep-sea surface sediments (ABYSS), Assessment of bacterial life and matter cycling in deep sea surface sediments ABYSS, Earth System Research

Funded by
EC| ABYSS
Project
ABYSS
ABYSS - Assessment of bacterial life and matter cycling in deep-sea surface sediments
  • Funder: European Commission (EC)
  • Project Code: 294757
  • Funding stream: FP7 | SP2 | ERC
Related to Research communities
European Marine Science
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Other ORP type . 2016
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