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Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake
Stockholm University, Faculty of Science, Department of Physical Geography.
Stockholm University, Faculty of Science, Department of Physical Geography.
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Number of Authors: 6
2017 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 27, no 11, 1745-1755 p.Article in journal (Refereed) Published
Abstract [en]

Four biotic proxies (plant macrofossils, pollen, chironomids and diatoms) are employed to quantitatively reconstruct variations in mean July air temperatures (T-jul) at Lake Loitsana (northern Finland) during the Holocene. The aim is to evaluate the robustness and biases in these temperature reconstructions and to compare the timing of highest T-jul in the individual reconstructions. The reconstructed T-jul values are evaluated in relation to local-scale/site-specific processes associated with the Holocene lake development at Loitsana as these factors have been shown to significantly influence the fossil assemblages found in the Lake Loitsana sediments. While pollen-based temperatures follow the classical trend of gradually increasing early-Holocene T-jul with a mid-Holocene maximum, the aquatic/wetland assemblages reconstruct higher-than-present T-jul already during the early Holocene, that is, at the peak of summer insolation. The relatively low early-Holocene July temperatures recorded by the pollen are the result of site-specific factors possibly combined with a delayed response of the terrestrial ecosystem compared with the aquatic ecosystem. Our study shows that all reconstructions are influenced at least to some extent by local factors. This finding stresses the need to evaluate quantitatively reconstructed climate values against local lake development and highlights the benefit of using multi-proxy data in Holocene climate reconstructions.

Place, publisher, year, edition, pages
2017. Vol. 27, no 11, 1745-1755 p.
Keyword [en]
chironomids, diatoms, ecological drivers, northern boreal Fennoscandia, plant macrofossils, pollen
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-150008DOI: 10.1177/0959683617708442ISI: 000415000900011OAI: oai:DiVA.org:su-150008DiVA: diva2:1167721
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-19Bibliographically approved

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Helmens, Karin F.Luoto, Tomi P.Salonen, J. SakariWeckström, Jan
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