Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene
Abstract The Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was exami...
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Language: | English |
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Cambridge University Press (CUP)
2020
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crcambridgeupr:10.1017/qua.2019.88 2024-09-09T19:40:01+00:00 Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene Nazarova, Larisa Syrykh, Liudmila S. Mayfield, Roseanna J. Frolova, Larisa A. Ibragimova, Aisylu G. Grekov, Ivan M. Subetto, Dmitry A. 2020 http://dx.doi.org/10.1017/qua.2019.88 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589419000887 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Quaternary Research volume 95, page 65-83 ISSN 0033-5894 1096-0287 journal-article 2020 crcambridgeupr https://doi.org/10.1017/qua.2019.88 2024-08-07T04:04:08Z Abstract The Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was examined to investigate variations in the Holocene climate. Analyses indicate that the dry and cold late Pleistocene climate was replaced by the warmer and more humid early Holocene climate after ca. 10.5 cal ka BP. During the early Holocene, the lake transitioned from an oligotrophic to a mesotrophic state, characterized by a “ Corynocera ambigua / Microtendipes pedellus -type” phase, which has been found in other lakes across Fennoscandia. Taxonomic shifts in the chironomid and cladoceran communities associated with climatic amelioration were identified at ca. 10.6 and 9.17 cal ka BP using breakpoint analysis. Reconstructed July temperatures indicate climatic patterns comparable to those seen in eastern Fennoscandia. The warm period between ca. 9.5 and 5.5 cal ka BP (T July 14.5–15°C) was interrupted by a slight cooling between ca. 8.5 and 8.1 cal ka BP, possibly relating to the 8.2 event, with peak temperature reached at ca. 7.8 cal ka BP. Neoglacial cooling started after ca. 5.5 cal ka BP, the median reconstructed July temperature dropped to 2–3°C cooler than present (mean T July 13.5°C) before recovering in recent time. Article in Journal/Newspaper Fennoscandia karelia* karelian Cambridge University Press Quaternary Research 95 65 83 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract The Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was examined to investigate variations in the Holocene climate. Analyses indicate that the dry and cold late Pleistocene climate was replaced by the warmer and more humid early Holocene climate after ca. 10.5 cal ka BP. During the early Holocene, the lake transitioned from an oligotrophic to a mesotrophic state, characterized by a “ Corynocera ambigua / Microtendipes pedellus -type” phase, which has been found in other lakes across Fennoscandia. Taxonomic shifts in the chironomid and cladoceran communities associated with climatic amelioration were identified at ca. 10.6 and 9.17 cal ka BP using breakpoint analysis. Reconstructed July temperatures indicate climatic patterns comparable to those seen in eastern Fennoscandia. The warm period between ca. 9.5 and 5.5 cal ka BP (T July 14.5–15°C) was interrupted by a slight cooling between ca. 8.5 and 8.1 cal ka BP, possibly relating to the 8.2 event, with peak temperature reached at ca. 7.8 cal ka BP. Neoglacial cooling started after ca. 5.5 cal ka BP, the median reconstructed July temperature dropped to 2–3°C cooler than present (mean T July 13.5°C) before recovering in recent time. |
format |
Article in Journal/Newspaper |
author |
Nazarova, Larisa Syrykh, Liudmila S. Mayfield, Roseanna J. Frolova, Larisa A. Ibragimova, Aisylu G. Grekov, Ivan M. Subetto, Dmitry A. |
spellingShingle |
Nazarova, Larisa Syrykh, Liudmila S. Mayfield, Roseanna J. Frolova, Larisa A. Ibragimova, Aisylu G. Grekov, Ivan M. Subetto, Dmitry A. Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
author_facet |
Nazarova, Larisa Syrykh, Liudmila S. Mayfield, Roseanna J. Frolova, Larisa A. Ibragimova, Aisylu G. Grekov, Ivan M. Subetto, Dmitry A. |
author_sort |
Nazarova, Larisa |
title |
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
title_short |
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
title_full |
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
title_fullStr |
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
title_full_unstemmed |
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene |
title_sort |
palaeoecological and palaeoclimatic conditions on the karelian isthmus (northwestern russia) during the holocene |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/qua.2019.88 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589419000887 |
genre |
Fennoscandia karelia* karelian |
genre_facet |
Fennoscandia karelia* karelian |
op_source |
Quaternary Research volume 95, page 65-83 ISSN 0033-5894 1096-0287 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/qua.2019.88 |
container_title |
Quaternary Research |
container_volume |
95 |
container_start_page |
65 |
op_container_end_page |
83 |
_version_ |
1809909144033951744 |