Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores
Thermokarst is a commonly observed process in the Arctic and an indicator of permafrost degradation. The formation of thermokarst landforms may indicate a localized disturbance to the ground thermal regime or be indicative of widespread permafrost degradation driven by climate-induced top-down perma...
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ftawi:oai:epic.awi.de:41258 2023-05-15T15:01:59+02:00 Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Walter Anthony, Katey M. Meyer, Hanno Bobrov, Anatoly Wulf, Sabine Grosse, Guido 2016-06-23 application/pdf https://epic.awi.de/id/eprint/41258/ https://epic.awi.de/id/eprint/41258/1/Poster_ICOP2016_Lenz.pdf https://www.conftool.pro/icop2016/index.php?page=browseSessions&form_session=144 https://hdl.handle.net/10013/epic.48175 https://hdl.handle.net/10013/epic.48175.d001 unknown https://epic.awi.de/id/eprint/41258/1/Poster_ICOP2016_Lenz.pdf https://hdl.handle.net/10013/epic.48175.d001 Lenz, J. orcid:0000-0002-4050-3169 , Wetterich, S. orcid:0000-0001-9234-1192 , Jones, B. M. , Walter Anthony, K. M. , Meyer, H. orcid:0000-0003-4129-4706 , Bobrov, A. , Wulf, S. and Grosse, G. orcid:0000-0001-5895-2141 (2016) Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores , 11th International Conference on Permafrost, Potsdam, Germany, 20 June 2016 - 24 June 2016 . hdl:10013/epic.48175 info:eu-repo/semantics/openAccess EPIC311th International Conference on Permafrost, Potsdam, Germany, 2016-06-20-2016-06-24 Conference notRev info:eu-repo/semantics/conferenceObject 2016 ftawi 2022-10-02T23:12:33Z Thermokarst is a commonly observed process in the Arctic and an indicator of permafrost degradation. The formation of thermokarst landforms may indicate a localized disturbance to the ground thermal regime or be indicative of widespread permafrost degradation driven by climate-induced top-down permafrost thaw. Thermokarst lakes are one of the most prominent landforms that develop in ice-rich arctic and boreal lowlands. In our study, we investigate two drained thermokarst lake basins on the northern Seward Peninsula in Central Beringia to gain insights into site-specific landscape development and past permafrost dynamics during glacial and interglacial periods. A 350 cm permafrost core (core ID: Kit-43) and a 400 cm permafrost core (core ID: Kit-64) were acquired from two drained lake basins that represent contrasting geological settings and cover a range of time periods (Mid-Wisconsin to Holocene). Kit-64 was a first generation lake in yedoma upland; Kit-43 was a later generation lake in a thermokarst-shaped lowland. The cores were analyzed using a multi-proxy approach including sedimentological (magnetic susceptibility, grain size), biogeochemical (TN, TC, TOC, δ13C), and micropaleontological methods (ostracods, testaceans), tephra analyses, radiocarbon dating on sediments, as well as isotope geochemical methods (δD and δ18O) on intra-sedimentary ground ice. The Kit-64 core was acquired from a first generation lake basin on a yedoma upland that preserved a depositional environment of more than 45,000 years (Lenz et al., 2015) including: (1) Mid-Wisconsin yedoma accumulation, (2) intermediate wetland development between 41,500 and 44,500 yr BP, (3) South Killeak Maar tephra deposition that interrupted the wetland development, (4) continued terrestrial yedoma accumulation probably until the Late Glacial when a significant gap in the sedimentary record indicates formation of thermokarst lakes in the surroundings of this site that prevented further accumulation, and (5) finally a 300 cal yr BP thermokarst lake ... Conference Object Arctic Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Beringia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Thermokarst is a commonly observed process in the Arctic and an indicator of permafrost degradation. The formation of thermokarst landforms may indicate a localized disturbance to the ground thermal regime or be indicative of widespread permafrost degradation driven by climate-induced top-down permafrost thaw. Thermokarst lakes are one of the most prominent landforms that develop in ice-rich arctic and boreal lowlands. In our study, we investigate two drained thermokarst lake basins on the northern Seward Peninsula in Central Beringia to gain insights into site-specific landscape development and past permafrost dynamics during glacial and interglacial periods. A 350 cm permafrost core (core ID: Kit-43) and a 400 cm permafrost core (core ID: Kit-64) were acquired from two drained lake basins that represent contrasting geological settings and cover a range of time periods (Mid-Wisconsin to Holocene). Kit-64 was a first generation lake in yedoma upland; Kit-43 was a later generation lake in a thermokarst-shaped lowland. The cores were analyzed using a multi-proxy approach including sedimentological (magnetic susceptibility, grain size), biogeochemical (TN, TC, TOC, δ13C), and micropaleontological methods (ostracods, testaceans), tephra analyses, radiocarbon dating on sediments, as well as isotope geochemical methods (δD and δ18O) on intra-sedimentary ground ice. The Kit-64 core was acquired from a first generation lake basin on a yedoma upland that preserved a depositional environment of more than 45,000 years (Lenz et al., 2015) including: (1) Mid-Wisconsin yedoma accumulation, (2) intermediate wetland development between 41,500 and 44,500 yr BP, (3) South Killeak Maar tephra deposition that interrupted the wetland development, (4) continued terrestrial yedoma accumulation probably until the Late Glacial when a significant gap in the sedimentary record indicates formation of thermokarst lakes in the surroundings of this site that prevented further accumulation, and (5) finally a 300 cal yr BP thermokarst lake ... |
format |
Conference Object |
author |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Walter Anthony, Katey M. Meyer, Hanno Bobrov, Anatoly Wulf, Sabine Grosse, Guido |
spellingShingle |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Walter Anthony, Katey M. Meyer, Hanno Bobrov, Anatoly Wulf, Sabine Grosse, Guido Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
author_facet |
Lenz, Josefine Wetterich, Sebastian Jones, Benjamin M. Walter Anthony, Katey M. Meyer, Hanno Bobrov, Anatoly Wulf, Sabine Grosse, Guido |
author_sort |
Lenz, Josefine |
title |
Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
title_short |
Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
title_full |
Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
title_fullStr |
Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
title_full_unstemmed |
Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores |
title_sort |
past permafrost and landscape dynamics in central beringia: two case studies from drained thermokarst lake basin cores |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41258/ https://epic.awi.de/id/eprint/41258/1/Poster_ICOP2016_Lenz.pdf https://www.conftool.pro/icop2016/index.php?page=browseSessions&form_session=144 https://hdl.handle.net/10013/epic.48175 https://hdl.handle.net/10013/epic.48175.d001 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Beringia |
genre_facet |
Arctic Ice Magnetic susceptibility permafrost Seward Peninsula Thermokarst Beringia |
op_source |
EPIC311th International Conference on Permafrost, Potsdam, Germany, 2016-06-20-2016-06-24 |
op_relation |
https://epic.awi.de/id/eprint/41258/1/Poster_ICOP2016_Lenz.pdf https://hdl.handle.net/10013/epic.48175.d001 Lenz, J. orcid:0000-0002-4050-3169 , Wetterich, S. orcid:0000-0001-9234-1192 , Jones, B. M. , Walter Anthony, K. M. , Meyer, H. orcid:0000-0003-4129-4706 , Bobrov, A. , Wulf, S. and Grosse, G. orcid:0000-0001-5895-2141 (2016) Past Permafrost and Landscape Dynamics in Central Beringia: Two Case Studies from Drained Thermokarst Lake Basin Cores , 11th International Conference on Permafrost, Potsdam, Germany, 20 June 2016 - 24 June 2016 . hdl:10013/epic.48175 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766333985781186560 |