Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake
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 reconst...
Published in: | The Holocene |
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Format: | Article in Journal/Newspaper |
Language: | English |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/307516 2024-01-07T09:41:50+01:00 Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake Shala, Shyhrete Helmens, Karin F. Luoto, Tomi P. Salonen, J. Sakari Väliranta, Minna Weckström, Jan Department of Geosciences and Geography Environmental Sciences Environmental Change Research Unit (ECRU) 2019-11-27T09:55:01Z 11 application/pdf http://hdl.handle.net/10138/307516 eng eng SAGE Publications Ltd STM 10.1177/0959683617708442 This project was funded by the Swedish Nuclear Fuel and Waste Management Company. The coring operation at Lake Loitsana was funded by Bolin Center for Climate Research, Stockholm University. Shyhrete Shala received funding for radiocarbon dating from the Carl Mannerfelt Foundation and the Swedish Society for Anthropology and Geography, and funding for a research visit to Helsinki University from INTIMATE COST Action. Tomi P Luoto received funding from the Emil Aaltonen Foundation (grant #160156). J Sakari Salonen received funding from the Academy of Finland (project #278692) and the Finnish Cultural Foundation. Minna Valiranta received funding from CLICHE project (Academy of Finland, grant no. 1140900). 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 ORCID: /0000-0002-8847-9081/work/39203872 ORCID: /0000-0003-0129-7240/work/39203954 ORCID: /0000-0001-5604-617X/work/39203171 85033498677 77503f28-f544-4669-9147-efea56fcb572 http://hdl.handle.net/10138/307516 000415000900011 openAccess info:eu-repo/semantics/openAccess 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 1171 Geosciences 1172 Environmental sciences Article acceptedVersion 2019 ftunivhelsihelda 2023-12-14T00:08:20Z 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. Peer reviewed Article in Journal/Newspaper Arctic Fennoscandia Northern Finland Lapland HELDA – University of Helsinki Open Repository Arctic Boreal Lake ENVELOPE(-127.670,-127.670,58.802,58.802) Norway The Holocene 27 11 1745 1755 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
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 1171 Geosciences 1172 Environmental sciences |
spellingShingle |
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 1171 Geosciences 1172 Environmental sciences Shala, Shyhrete Helmens, Karin F. Luoto, Tomi P. Salonen, J. Sakari Väliranta, Minna Weckström, Jan Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
topic_facet |
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 1171 Geosciences 1172 Environmental sciences |
description |
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. Peer reviewed |
author2 |
Department of Geosciences and Geography Environmental Sciences Environmental Change Research Unit (ECRU) |
format |
Article in Journal/Newspaper |
author |
Shala, Shyhrete Helmens, Karin F. Luoto, Tomi P. Salonen, J. Sakari Väliranta, Minna Weckström, Jan |
author_facet |
Shala, Shyhrete Helmens, Karin F. Luoto, Tomi P. Salonen, J. Sakari Väliranta, Minna Weckström, Jan |
author_sort |
Shala, Shyhrete |
title |
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
title_short |
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
title_full |
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
title_fullStr |
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
title_full_unstemmed |
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake |
title_sort |
comparison of quantitative holocene temperature reconstructions using multiple proxies from a northern boreal lake |
publisher |
SAGE Publications Ltd STM |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/307516 |
long_lat |
ENVELOPE(-127.670,-127.670,58.802,58.802) |
geographic |
Arctic Boreal Lake Norway |
geographic_facet |
Arctic Boreal Lake Norway |
genre |
Arctic Fennoscandia Northern Finland Lapland |
genre_facet |
Arctic Fennoscandia Northern Finland Lapland |
op_relation |
10.1177/0959683617708442 This project was funded by the Swedish Nuclear Fuel and Waste Management Company. The coring operation at Lake Loitsana was funded by Bolin Center for Climate Research, Stockholm University. Shyhrete Shala received funding for radiocarbon dating from the Carl Mannerfelt Foundation and the Swedish Society for Anthropology and Geography, and funding for a research visit to Helsinki University from INTIMATE COST Action. Tomi P Luoto received funding from the Emil Aaltonen Foundation (grant #160156). J Sakari Salonen received funding from the Academy of Finland (project #278692) and the Finnish Cultural Foundation. Minna Valiranta received funding from CLICHE project (Academy of Finland, grant no. 1140900). 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 ORCID: /0000-0002-8847-9081/work/39203872 ORCID: /0000-0003-0129-7240/work/39203954 ORCID: /0000-0001-5604-617X/work/39203171 85033498677 77503f28-f544-4669-9147-efea56fcb572 http://hdl.handle.net/10138/307516 000415000900011 |
op_rights |
openAccess info:eu-repo/semantics/openAccess |
container_title |
The Holocene |
container_volume |
27 |
container_issue |
11 |
container_start_page |
1745 |
op_container_end_page |
1755 |
_version_ |
1787422638207926272 |