Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska
Permafrost degradation influences the morphology, biogeochemical cycling and hydrology of Arctic landscapes over a range of time scales. To reconstruct temporal patterns of early to late Holocene permafrost and thermokarst dynamics, site‐specific palaeo‐records are needed. Here we present a multi‐pr...
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crwiley:10.1111/bor.12186 2024-09-15T18:11:31+00:00 Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Meyer, Hanno Bobrov, Anatoly Grosse, Guido National Science Foundation National Aeronautics and Space Administration Russian Foundation for Basic Research European Research Council Universität Potsdam 2016 http://dx.doi.org/10.1111/bor.12186 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12186 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12186 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12186 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12186 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 45, issue 4, page 584-603 ISSN 0300-9483 1502-3885 journal-article 2016 crwiley https://doi.org/10.1111/bor.12186 2024-07-02T04:11:11Z Permafrost degradation influences the morphology, biogeochemical cycling and hydrology of Arctic landscapes over a range of time scales. To reconstruct temporal patterns of early to late Holocene permafrost and thermokarst dynamics, site‐specific palaeo‐records are needed. Here we present a multi‐proxy study of a 350‐cm‐long permafrost core from a drained lake basin on the northern Seward Peninsula, Alaska, revealing Lateglacial to Holocene thermokarst lake dynamics in a central location of Beringia. Use of radiocarbon dating, micropalaeontology (ostracods and testaceans), sedimentology (grain‐size analyses, magnetic susceptibility, tephra analyses), geochemistry (total nitrogen and carbon, total organic carbon, δ 13 C org ) and stable water isotopes (δ 18 O, δD, d excess) of ground ice allowed the reconstruction of several distinct thermokarst lake phases. These include a pre‐lacustrine environment at the base of the core characterized by the Devil Mountain Maar tephra (22 800±280 cal. a BP , Unit A), which has vertically subsided in places due to subsequent development of a deep thermokarst lake that initiated around 11 800 cal. a BP (Unit B). At about 9000 cal. a BP this lake transitioned from a stable depositional environment to a very dynamic lake system (Unit C) characterized by fluctuating lake levels, potentially intermediate wetland development, and expansion and erosion of shore deposits. Complete drainage of this lake occurred at 1060 cal. a BP , including post‐drainage sediment freezing from the top down to 154 cm and gradual accumulation of terrestrial peat (Unit D), as well as uniform upward talik refreezing. This core‐based reconstruction of multiple thermokarst lake generations since 11 800 cal. a BP improves our understanding of the temporal scales of thermokarst lake development from initiation to drainage, demonstrates complex landscape evolution in the ice‐rich permafrost regions of Central Beringia during the Lateglacial and Holocene, and enhances our understanding of biogeochemical cycles ... Article in Journal/Newspaper Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Alaska Beringia Wiley Online Library Boreas 45 4 584 603 |
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Wiley Online Library |
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crwiley |
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English |
description |
Permafrost degradation influences the morphology, biogeochemical cycling and hydrology of Arctic landscapes over a range of time scales. To reconstruct temporal patterns of early to late Holocene permafrost and thermokarst dynamics, site‐specific palaeo‐records are needed. Here we present a multi‐proxy study of a 350‐cm‐long permafrost core from a drained lake basin on the northern Seward Peninsula, Alaska, revealing Lateglacial to Holocene thermokarst lake dynamics in a central location of Beringia. Use of radiocarbon dating, micropalaeontology (ostracods and testaceans), sedimentology (grain‐size analyses, magnetic susceptibility, tephra analyses), geochemistry (total nitrogen and carbon, total organic carbon, δ 13 C org ) and stable water isotopes (δ 18 O, δD, d excess) of ground ice allowed the reconstruction of several distinct thermokarst lake phases. These include a pre‐lacustrine environment at the base of the core characterized by the Devil Mountain Maar tephra (22 800±280 cal. a BP , Unit A), which has vertically subsided in places due to subsequent development of a deep thermokarst lake that initiated around 11 800 cal. a BP (Unit B). At about 9000 cal. a BP this lake transitioned from a stable depositional environment to a very dynamic lake system (Unit C) characterized by fluctuating lake levels, potentially intermediate wetland development, and expansion and erosion of shore deposits. Complete drainage of this lake occurred at 1060 cal. a BP , including post‐drainage sediment freezing from the top down to 154 cm and gradual accumulation of terrestrial peat (Unit D), as well as uniform upward talik refreezing. This core‐based reconstruction of multiple thermokarst lake generations since 11 800 cal. a BP improves our understanding of the temporal scales of thermokarst lake development from initiation to drainage, demonstrates complex landscape evolution in the ice‐rich permafrost regions of Central Beringia during the Lateglacial and Holocene, and enhances our understanding of biogeochemical cycles ... |
author2 |
National Science Foundation National Aeronautics and Space Administration Russian Foundation for Basic Research European Research Council Universität Potsdam |
format |
Article in Journal/Newspaper |
author |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Meyer, Hanno Bobrov, Anatoly Grosse, Guido |
spellingShingle |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Meyer, Hanno Bobrov, Anatoly Grosse, Guido Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
author_facet |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Meyer, Hanno Bobrov, Anatoly Grosse, Guido |
author_sort |
Lenz, Josefine |
title |
Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
title_short |
Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
title_full |
Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
title_fullStr |
Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
title_full_unstemmed |
Evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern Seward Peninsula, Alaska |
title_sort |
evidence of multiple thermokarst lake generations from an 11 800‐year‐old permafrost core on the northern seward peninsula, alaska |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/bor.12186 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12186 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12186 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12186 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12186 |
genre |
Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Alaska Beringia |
genre_facet |
Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Alaska Beringia |
op_source |
Boreas volume 45, issue 4, page 584-603 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12186 |
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Boreas |
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45 |
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4 |
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584 |
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1810449111758929920 |