Shala , S , Helmens , K F , Luoto , T P , Salonen , J S , Väliranta , M & Weckström , J 2017 , ' Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake ' , Holocene , vol. 27 , no. 11 , pp. 1745-1755 . https://doi.org/10.1177/0959683617708442
Title: | Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
Author: | Shala, Shyhrete; Helmens, Karin F.; Luoto, Tomi P.; Salonen, J. Sakari; Väliranta, Minna; Weckström, Jan |
Contributor organization: | Department of Geosciences and Geography Environmental Sciences Environmental Change Research Unit (ECRU) |
Date: | 2017-11 |
Language: | eng |
Number of pages: | 11 |
Belongs to series: | Holocene |
ISSN: | 0959-6836 |
DOI: | https://doi.org/10.1177/0959683617708442 |
URI: | http://hdl.handle.net/10138/307516 |
Abstract: | 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. |
Subject: |
chironomids
diatoms ecological drivers northern boreal Fennoscandia plant macrofossils pollen EASTERN-EUROPEAN RUSSIA SUB-ARCTIC FINLAND TREE-LINE AREA PALEOCLIMATE RECONSTRUCTIONS CLIMATE RECONSTRUCTIONS CHIRONOMIDAE INSECTA FINNISH LAPLAND CENTRAL NORWAY POLLEN DIATOMS 1171 Geosciences 1172 Environmental sciences |
Peer reviewed: | Yes |
Usage restriction: | openAccess |
Self-archived version: | acceptedVersion |
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