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Organic matter delivery to Quaternary sediments of Amundsen Basin, central Arctic Ocean
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Department of Earth and Environmental Sciences, The University of Michigan, Ann Arbor, Michigan, U.S.A..
Stockholm University, Faculty of Science, Department of Geological Sciences.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Quaternary marine sediments retrieved from the central Arctic Ocean in a 30 cm long core, were analyzed for paleoenvironmental reconstruction. n-Alkane biomarkers combined with elemental analyses that include X-ray fluorescence (XRF) core scanning provide complementary information that suggest important influxes of terrigenous derived organic matter (OM) with depth. Changes in the variability of n-alkane-derived and elemental ratios with depth reflect the complexity of the organic carbon cycle in this region. The distributions and abundances of the long-chain n-alkanes reveal a high content of terrigenous derived components and suggest together with mathematical estimations high deliveries of the terrigenous OM in the past. XRF trace metal analyses suggest less-oxygenated bottom waters that may have allowed for better preservation conditions of OM deeper in the core.

Keyword [en]
n-alkanes, biomarkers, Arctic Ocean, Lomonosov Ridge
National Category
Natural Sciences
Research subject
Geochemistry
Identifiers
URN: urn:nbn:se:su:diva-65274OAI: oai:DiVA.org:su-65274DiVA: diva2:462140
Available from: 2011-12-06 Created: 2011-12-06 Last updated: 2012-01-02Bibliographically approved
In thesis
1. Lipid biomarkers and other geochemical indicators in paleoenvironmental studies of two Arctic systems: a Russian permafrost peatland and marine sediments from the Lomonosov Ridge
Open this publication in new window or tab >>Lipid biomarkers and other geochemical indicators in paleoenvironmental studies of two Arctic systems: a Russian permafrost peatland and marine sediments from the Lomonosov Ridge
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The reconstruction of past environmental conditions is a fascinating research area that attracts the interest of many individuals in various geological disciplines. Paleoenvironmental reconstruction studies can shed light on the understanding of past climates and are a key to the prediction of future climate changes and their consequences. These studies take on special significance when focused on areas sensitive to climate change. The Arctic region, which is experiencing dramatic changes today in its peatlands and in its ocean, is prime example. The entire region plays a major role in global climate changes and has recently received considerable interest because of the potential feedbacks to climate change and its importance in the global carbon cycle.

For a better understanding of the role of Arctic peatlands and the Arctic Ocean to global climate changes, more records of past conditions and changes in the region are needed. This work applies different geochemical proxies, with special emphasis on lipid biomarkers, to the study of a permafrost peat deposit collected from the Eastern European Russian Arctic and a marine core retrieved from the Lomonosov Ridge in the central Arctic Ocean. The results reported of this study show that molecular stratigraphy obtained from the analysis of lipid biomarkers in both peat and marine profiles, combined with other environmental proxies, can contribute significantly to the study of Arctic ecosystems of the past.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2012. 17 p.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 347
Keyword
lipid biomarkers, peat, permafrost, Arctic Ocean, marine sediments
National Category
Earth and Related Environmental Sciences
Research subject
Geochemistry
Identifiers
urn:nbn:se:su:diva-65350 (URN)978-91-7447-382-7 (ISBN)
Public defence
2012-01-23, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2012-01-02 Created: 2011-12-07 Last updated: 2014-09-12Bibliographically approved

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