Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada
Abstract Thermokarst lakes form following the thaw of ice‐rich permafrost and drain after a few decades to millennia. Drained thermokarst lake basins (DTLBs) become epicenters for peat accumulation and re‐aggradation of ice‐rich permafrost. This re‐aggradation of permafrost may be interrupted by sub...
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crwiley:10.1002/ppp.2073 2024-06-02T08:07:58+00:00 Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada Bandara, Sasiri Froese, Duane Porter, Trevor J. Calmels, Fabrice Natural Sciences and Engineering Research Council of Canada W. Garfield Weston Foundation 2020 http://dx.doi.org/10.1002/ppp.2073 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2073 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2073 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2073 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 31, issue 4, page 497-508 ISSN 1045-6740 1099-1530 journal-article 2020 crwiley https://doi.org/10.1002/ppp.2073 2024-05-03T11:40:47Z Abstract Thermokarst lakes form following the thaw of ice‐rich permafrost and drain after a few decades to millennia. Drained thermokarst lake basins (DTLBs) become epicenters for peat accumulation and re‐aggradation of ice‐rich permafrost. This re‐aggradation of permafrost may be interrupted by subsequent thermokarst lake formation with sufficient disturbance. Thermokarst lakes and DTLBs are abundant near Old Crow, Yukon, Canada, but little is known about their evolution through the Holocene. In this study, we investigate the hydrology and drainage histories of seven DTLBs from the Old Crow Flats on the basis of cryostratigraphy, radiocarbon dating, and pore‐ice δ 18 O and δ 2 H records. Cryostratigraphic evidence implies only one of the seven studied DTLBs underwent multiple thermokarst cycles. Radiocarbon age–depth models demonstrate a slowdown in the rate of post‐drainage peat accumulation with time. Pore‐ice isotope analyses reveal a spectrum of possible post‐drainage isotopic histories resulting from spatial variability in permafrost, vegetation, and hydrology. Unlike lacustrine silt, post‐drainage peat contains relatively constant pore‐ice isotope trends. In light of our findings, we propose that syngenetic peat permafrost in DTLBs preserve a warm‐season sampling of local meteoric waters. These pore‐ice δ 18 O and δ 2 H records may aid millennial‐scale paleoclimate investigations, as we demonstrate through our reconstruction of Holocene climate change in northern Yukon. Article in Journal/Newspaper Ice Old Crow permafrost Permafrost and Periglacial Processes Thermokarst Yukon Wiley Online Library Canada Old Crow Flats ENVELOPE(-139.755,-139.755,68.083,68.083) Yukon Permafrost and Periglacial Processes 31 4 497 508 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Thermokarst lakes form following the thaw of ice‐rich permafrost and drain after a few decades to millennia. Drained thermokarst lake basins (DTLBs) become epicenters for peat accumulation and re‐aggradation of ice‐rich permafrost. This re‐aggradation of permafrost may be interrupted by subsequent thermokarst lake formation with sufficient disturbance. Thermokarst lakes and DTLBs are abundant near Old Crow, Yukon, Canada, but little is known about their evolution through the Holocene. In this study, we investigate the hydrology and drainage histories of seven DTLBs from the Old Crow Flats on the basis of cryostratigraphy, radiocarbon dating, and pore‐ice δ 18 O and δ 2 H records. Cryostratigraphic evidence implies only one of the seven studied DTLBs underwent multiple thermokarst cycles. Radiocarbon age–depth models demonstrate a slowdown in the rate of post‐drainage peat accumulation with time. Pore‐ice isotope analyses reveal a spectrum of possible post‐drainage isotopic histories resulting from spatial variability in permafrost, vegetation, and hydrology. Unlike lacustrine silt, post‐drainage peat contains relatively constant pore‐ice isotope trends. In light of our findings, we propose that syngenetic peat permafrost in DTLBs preserve a warm‐season sampling of local meteoric waters. These pore‐ice δ 18 O and δ 2 H records may aid millennial‐scale paleoclimate investigations, as we demonstrate through our reconstruction of Holocene climate change in northern Yukon. |
author2 |
Natural Sciences and Engineering Research Council of Canada W. Garfield Weston Foundation |
format |
Article in Journal/Newspaper |
author |
Bandara, Sasiri Froese, Duane Porter, Trevor J. Calmels, Fabrice |
spellingShingle |
Bandara, Sasiri Froese, Duane Porter, Trevor J. Calmels, Fabrice Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
author_facet |
Bandara, Sasiri Froese, Duane Porter, Trevor J. Calmels, Fabrice |
author_sort |
Bandara, Sasiri |
title |
Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
title_short |
Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
title_full |
Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
title_fullStr |
Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
title_full_unstemmed |
Holocene pore‐ice δ 18 O and δ 2 H records from drained thermokarst lake basins in the Old Crow Flats, Yukon, Canada |
title_sort |
holocene pore‐ice δ 18 o and δ 2 h records from drained thermokarst lake basins in the old crow flats, yukon, canada |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ppp.2073 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2073 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2073 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2073 |
long_lat |
ENVELOPE(-139.755,-139.755,68.083,68.083) |
geographic |
Canada Old Crow Flats Yukon |
geographic_facet |
Canada Old Crow Flats Yukon |
genre |
Ice Old Crow permafrost Permafrost and Periglacial Processes Thermokarst Yukon |
genre_facet |
Ice Old Crow permafrost Permafrost and Periglacial Processes Thermokarst Yukon |
op_source |
Permafrost and Periglacial Processes volume 31, issue 4, page 497-508 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.2073 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
31 |
container_issue |
4 |
container_start_page |
497 |
op_container_end_page |
508 |
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1800753122689155072 |