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Stable isotope records of Sphagnum fuscum peat as late Holocene climate proxies in north-eastern European Russia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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(English)Manuscript (preprint) (Other academic)
Keyword [en]
stable isotopes, climate, tundra, northern taiga, peat, Sphagnum
National Category
Geology
Research subject
Quarternary Geology
Identifiers
URN: urn:nbn:se:su:diva-74696OAI: oai:DiVA.org:su-74696DiVA: diva2:511305
Projects
Holocene climate and environmental change as recorded by stable isotopes in peat deposits
Available from: 2012-03-20 Created: 2012-03-20 Last updated: 2012-04-10Bibliographically approved
In thesis
1. Holocene climate and environmental change in high latitudes as recorded by stable isotopes in peat deposits
Open this publication in new window or tab >>Holocene climate and environmental change in high latitudes as recorded by stable isotopes in peat deposits
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, stable carbon and oxygen isotopes in α-cellulose isolated from Sphagnum fuscum moss remains were used as climate proxies. The main focus was to implement the methods in records from high latitude peatlands in the Northern Hemisphere (west-central Canada and north-eastern European Russia), reconstruct palaeoclimate of the studied regions during the Holocene, and evaluate the compatibility of results with other proxy records, especially tree-ring isotope time-series. The variation of stable carbon and oxygen isotope ratios (δ13C, δ18O) in different moss plant components was investigated and differences between untreated plants and α-cellulose extracts were evaluated. The impact of peat decay on the stable isotope proxies was studied by colorimetric and chemical (C/N) methods. Temperature reconstructions were developed based on the statistically significant relationship between δ13C and modern summer temperature records. Wet/dry periods were derived from a combination of δ18O records, macrofossil analysis, and a peat humification record in west-central Canada. A tentative reconstruction of snow depth in north-eastern European Russian tundra and northern taiga was based on δ18O records. The most promising result of the thesis is that stable carbon isotope variability in α-cellulose isolated from Sphagnum fuscum stems can be used to reconstruct and quantify palaeotemperatures several millennia back in time and to reveal both long-term and rapid climate shifts from peat archives.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2012. 36 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 32
Keyword
stable isotopes, Holocene, subarctic, climate, Sphagnum fuscum
National Category
Earth and Related Environmental Sciences
Research subject
Quarternary Geology
Identifiers
urn:nbn:se:su:diva-75026 (URN)978-91-7447-472-5 (ISBN)
Public defence
2012-05-11, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

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

Available from: 2012-04-19 Created: 2012-04-03 Last updated: 2013-09-20Bibliographically approved

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