New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model
Abstract Paleoclimate reconstructions based on biological proxies present methodological challenges, especially during non-analog conditions, such as the early Holocene. Here, two chironomid-based training sets from Finland were amalgamated to create a more accurate transfer function of summer air t...
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crcambridgeupr:10.1016/j.yqres.2013.09.010 2024-06-16T07:43:23+00:00 New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model Luoto, Tomi P. Kaukolehto, Marjut Weckström, Jan Korhola, Atte Väliranta, Minna 2014 http://dx.doi.org/10.1016/j.yqres.2013.09.010 http://api.elsevier.com/content/article/PII:S0033589413001129?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589413001129?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400002064 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 81, issue 1, page 50-62 ISSN 0033-5894 1096-0287 journal-article 2014 crcambridgeupr https://doi.org/10.1016/j.yqres.2013.09.010 2024-05-22T12:55:36Z Abstract Paleoclimate reconstructions based on biological proxies present methodological challenges, especially during non-analog conditions, such as the early Holocene. Here, two chironomid-based training sets from Finland were amalgamated to create a more accurate transfer function of summer air temperature. The aim was to reconstruct Holocene paleoclimate in northernmost Lapland, in an area that has been either too warm or too cold for reliable reconstructions using the original calibration models. The results showed that the combined calibration model had improved performance statistics. The temperature trends inferred from the downcore chironomid record using the original and combined models were very similar. However, there were major changes in their absolute values with the combined model showing greatly improved accuracy. The chironomid-based temperature reconstruction showed significant correlation with the previous pollen-based reconstructions from northwestern Finnish Lapland. However, differences were observed in the temperature trends of the early Holocene, when the chironomid-inferred temperatures rapidly increased, but the pollen-based reconstructions lagged behind suggesting that a cool climate continued for much longer. However, similar to the chironomid record, new plant macrofossil evidence from northwestern Finland also showed warmer-than-present early Holocene temperatures. Therefore, we conclude that the early Holocene was probably warm in northern Lapland. Article in Journal/Newspaper Subarctic Lapland Cambridge University Press Quaternary Research 81 1 50 62 |
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Cambridge University Press |
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English |
description |
Abstract Paleoclimate reconstructions based on biological proxies present methodological challenges, especially during non-analog conditions, such as the early Holocene. Here, two chironomid-based training sets from Finland were amalgamated to create a more accurate transfer function of summer air temperature. The aim was to reconstruct Holocene paleoclimate in northernmost Lapland, in an area that has been either too warm or too cold for reliable reconstructions using the original calibration models. The results showed that the combined calibration model had improved performance statistics. The temperature trends inferred from the downcore chironomid record using the original and combined models were very similar. However, there were major changes in their absolute values with the combined model showing greatly improved accuracy. The chironomid-based temperature reconstruction showed significant correlation with the previous pollen-based reconstructions from northwestern Finnish Lapland. However, differences were observed in the temperature trends of the early Holocene, when the chironomid-inferred temperatures rapidly increased, but the pollen-based reconstructions lagged behind suggesting that a cool climate continued for much longer. However, similar to the chironomid record, new plant macrofossil evidence from northwestern Finland also showed warmer-than-present early Holocene temperatures. Therefore, we conclude that the early Holocene was probably warm in northern Lapland. |
format |
Article in Journal/Newspaper |
author |
Luoto, Tomi P. Kaukolehto, Marjut Weckström, Jan Korhola, Atte Väliranta, Minna |
spellingShingle |
Luoto, Tomi P. Kaukolehto, Marjut Weckström, Jan Korhola, Atte Väliranta, Minna New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
author_facet |
Luoto, Tomi P. Kaukolehto, Marjut Weckström, Jan Korhola, Atte Väliranta, Minna |
author_sort |
Luoto, Tomi P. |
title |
New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
title_short |
New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
title_full |
New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
title_fullStr |
New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
title_full_unstemmed |
New evidence of warm early-Holocene summers in subarctic Finland based on an enhanced regional chironomid-based temperature calibration model |
title_sort |
new evidence of warm early-holocene summers in subarctic finland based on an enhanced regional chironomid-based temperature calibration model |
publisher |
Cambridge University Press (CUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1016/j.yqres.2013.09.010 http://api.elsevier.com/content/article/PII:S0033589413001129?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589413001129?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400002064 |
genre |
Subarctic Lapland |
genre_facet |
Subarctic Lapland |
op_source |
Quaternary Research volume 81, issue 1, page 50-62 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2013.09.010 |
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Quaternary Research |
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81 |
container_issue |
1 |
container_start_page |
50 |
op_container_end_page |
62 |
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1802011246861484032 |