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Impacts of paleohydrological changes on n-alkane biomarker compositions of a Holocene peat sequence in the eastern European Russian Arctic
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi och kvartärgeologi (INK).
Department of Earth and Environmental Sciences, The University of Michigan, Ann Arbor, Michigan, U.S.A..
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för tillämpad miljövetenskap (ITM).
Vise andre og tillknytning
2011 (engelsk)Inngår i: Organic Geochemistry, ISSN 0146-6380, E-ISSN 1873-5290, Vol. 42, nr 9, s. 1065-1075Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Coupled analyses of n-alkane biomarkers and plant macrofossils from a peat plateau deposit in the northeast European Russian Arctic were carried out to assess the effects of past hydrology on the molecular contributions of plants to the peat. The n-alkane biomarkers accumulated over 9.6 kyr of local paleohydrological changes in this complex peat profile in which a succession of vegetation changes occurred during a transition from a wet fen to a relatively dry peat plateau bog. This study shows that the contribution of the n-C31 alkane from rootlets to peat layers rich in fine and dark roots is important. The results further indicate that the n-alkanePaqandn-C23/n-C29 biomarker proxies that have been useful to reconstruct past water table levels in many peat deposits can be misleading when the contributions of Betulaand Sphagnum fuscum to the peat are large. Under these conditions, the C23/(C27+ C31) n-alkane ratio seems to correct for the presence of BetulaandS. fuscum and provides a better description for the relative amounts of moisture. The average chain length (ACL) n-alkane proxy also appears to be a good paleohydrology proxy in having larger values during dry and cold conditions in this Arctic bog setting.

sted, utgiver, år, opplag, sider
Elsevier , 2011. Vol. 42, nr 9, s. 1065-1075
Emneord [en]
peat, permafrost, n-alkanes, biomarkers, Holocene
HSV kategori
Forskningsprogram
biogeokemi
Identifikatorer
URN: urn:nbn:se:su:diva-62806DOI: 10.1016/j.orggeochem.2011.06.020ISI: 000295610800007OAI: oai:DiVA.org:su-62806DiVA, id: diva2:457655
Tilgjengelig fra: 2011-12-06 Laget: 2011-09-30 Sist oppdatert: 2020-02-06bibliografisk kontrollert
Inngår i avhandling
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
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Department of Geological Sciences, Stockholm University, 2012. s. 17
Serie
Meddelanden från Stockholms universitets institution för geologiska vetenskaper ; 347
Emneord
lipid biomarkers, peat, permafrost, Arctic Ocean, marine sediments
HSV kategori
Forskningsprogram
geokemi
Identifikatorer
urn:nbn:se:su:diva-65350 (URN)978-91-7447-382-7 (ISBN)
Disputas
2012-01-23, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

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.

Tilgjengelig fra: 2012-01-02 Laget: 2011-12-07 Sist oppdatert: 2014-09-12bibliografisk kontrollert

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