Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska
Permafrost-related processes drive regional landscape dynamics in the Arctic terrestrial system. A better understanding of past periods indicative of permafrost degradation and aggradation is important for predicting the future response of Arctic landscapes to climate change. Here, we used a multi-p...
Published in: | Permafrost and Periglacial Processes |
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:45836 2023-05-15T14:51:58+02:00 Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska Lenz, Josefine Grosse, Guido Jones, Benjamin M. Anthony, Katey M. Walter Bobrov, Anatoly Wulf, Sabine Wetterich, Sebastian 2016 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/45836 https://doi.org/10.1002/ppp.1848 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/45836 https://doi.org/10.1002/ppp.1848 info:eu-repo/semantics/closedAccess Institut für Geowissenschaften article doc-type:article 2016 ftubpotsdam https://doi.org/10.1002/ppp.1848 2022-07-28T20:48:56Z Permafrost-related processes drive regional landscape dynamics in the Arctic terrestrial system. A better understanding of past periods indicative of permafrost degradation and aggradation is important for predicting the future response of Arctic landscapes to climate change. Here, we used a multi-proxy approach to analyse a4m long sediment core from a drained thermokarst lake basin on the northern Seward Peninsula in western Arctic Alaska (USA). Sedimentological, biogeochemical, geochronological, micropalaeontological (ostracoda, testate amoebae) and tephra analyses were used to determine the long-term environmental Early-Wisconsin to Holocene history preserved in our core for central Beringia. Yedoma accumulation dominated throughout the Early to Late-Wisconsin but was interrupted by wetland formation from 44.5 to 41.5ka BP. The latter was terminated by the deposition of 1m of volcanic tephra, most likely originating from the South Killeak Maar eruption at about 42ka BP. Yedoma deposition continued until 22.5ka BP and was followed by a depositional hiatus in the sediment core between 22.5 and 0.23ka BP. We interpret this hiatus as due to intense thermokarst activity in the areas surrounding the site, which served as a sediment source during the Late-Wisconsin to Holocene climate transition. The lake forming the modern basin on the upland initiated around 0.23ka BP and drained catastrophically in spring 2005. The present study emphasises that Arctic lake systems and periglacial landscapes are highly dynamic and that permafrost formation as well as degradation in central Beringia was controlled by regional to global climate patterns as well as by local disturbances. Copyright (c) 2015 John Wiley & Sons, Ltd. Article in Journal/Newspaper Arctic Climate change permafrost Seward Peninsula Thermokarst Alaska Beringia University of Potsdam: publish.UP Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Permafrost and Periglacial Processes 27 1 56 75 |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
Institut für Geowissenschaften |
spellingShingle |
Institut für Geowissenschaften Lenz, Josefine Grosse, Guido Jones, Benjamin M. Anthony, Katey M. Walter Bobrov, Anatoly Wulf, Sabine Wetterich, Sebastian Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
topic_facet |
Institut für Geowissenschaften |
description |
Permafrost-related processes drive regional landscape dynamics in the Arctic terrestrial system. A better understanding of past periods indicative of permafrost degradation and aggradation is important for predicting the future response of Arctic landscapes to climate change. Here, we used a multi-proxy approach to analyse a4m long sediment core from a drained thermokarst lake basin on the northern Seward Peninsula in western Arctic Alaska (USA). Sedimentological, biogeochemical, geochronological, micropalaeontological (ostracoda, testate amoebae) and tephra analyses were used to determine the long-term environmental Early-Wisconsin to Holocene history preserved in our core for central Beringia. Yedoma accumulation dominated throughout the Early to Late-Wisconsin but was interrupted by wetland formation from 44.5 to 41.5ka BP. The latter was terminated by the deposition of 1m of volcanic tephra, most likely originating from the South Killeak Maar eruption at about 42ka BP. Yedoma deposition continued until 22.5ka BP and was followed by a depositional hiatus in the sediment core between 22.5 and 0.23ka BP. We interpret this hiatus as due to intense thermokarst activity in the areas surrounding the site, which served as a sediment source during the Late-Wisconsin to Holocene climate transition. The lake forming the modern basin on the upland initiated around 0.23ka BP and drained catastrophically in spring 2005. The present study emphasises that Arctic lake systems and periglacial landscapes are highly dynamic and that permafrost formation as well as degradation in central Beringia was controlled by regional to global climate patterns as well as by local disturbances. Copyright (c) 2015 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Lenz, Josefine Grosse, Guido Jones, Benjamin M. Anthony, Katey M. Walter Bobrov, Anatoly Wulf, Sabine Wetterich, Sebastian |
author_facet |
Lenz, Josefine Grosse, Guido Jones, Benjamin M. Anthony, Katey M. Walter Bobrov, Anatoly Wulf, Sabine Wetterich, Sebastian |
author_sort |
Lenz, Josefine |
title |
Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
title_short |
Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
title_full |
Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
title_fullStr |
Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
title_full_unstemmed |
Mid-Wisconsin to Holocene Permafrost and Landscape Dynamics based on a Drained Lake Basin Core from the Northern Seward Peninsula, Northwest Alaska |
title_sort |
mid-wisconsin to holocene permafrost and landscape dynamics based on a drained lake basin core from the northern seward peninsula, northwest alaska |
publishDate |
2016 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/45836 https://doi.org/10.1002/ppp.1848 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic Climate change permafrost Seward Peninsula Thermokarst Alaska Beringia |
genre_facet |
Arctic Climate change permafrost Seward Peninsula Thermokarst Alaska Beringia |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/45836 https://doi.org/10.1002/ppp.1848 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1002/ppp.1848 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
27 |
container_issue |
1 |
container_start_page |
56 |
op_container_end_page |
75 |
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1766323096513413120 |