Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska
Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 boreholes w...
Published in: | Permafrost and Periglacial Processes |
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Language: | unknown |
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Online Access: | https://doi.org/10.1002/ppp.2046 |
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ftrepec:oai:RePEc:wly:perpro:v:31:y:2020:i:2:p:239-254 2023-05-15T15:07:23+02:00 Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska Eva Stephani Jeremiah Drage Duane Miller Benjamin M. Jones Mikhail Kanevskiy https://doi.org/10.1002/ppp.2046 unknown https://doi.org/10.1002/ppp.2046 article ftrepec https://doi.org/10.1002/ppp.2046 2020-12-04T13:40:38Z Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 boreholes with a remote sensing analysis to measure channel changes in 1948–2013. We found that closed taliks occurred under the active channel and extended into intrapermafrost cryopeg layers under the riverbed/riverbar and active floodplain. Cryopegs as isolated small pockets were also identified at depths in older terrain units. In the study corridor, we estimated that the likelihood of talik and cryopeg occurrence was predominantly (42.2% of area) low, yet a high likelihood was also identified (27.0% of area). Permafrost growth occurred at a rapid rate in the land exposed following channel migration, likely due to the low and delayed release of latent heat as the freezing front progresses downward in the coarse‐grained soils of increasing salinity but decreasing temperatures. As the deposits keep cooling, ground ice will continue forming therefore increasing furthermore the salinity of the remaining unfrozen soil pore‐water and likely prevent the complete freezeback of the cryopegs developed in relation to channel migration. Article in Journal/Newspaper Arctic Ice permafrost Alaska RePEc (Research Papers in Economics) Arctic Talik ENVELOPE(146.601,146.601,59.667,59.667) Permafrost and Periglacial Processes 31 2 239 254 |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
Talik and cryopeg development related to channel migration has been observed in arctic deltas, but our knowledge on the configuration, properties, and rate of freezeback has remained limited. Along a main channel of the Colville River Delta (Alaska), we integrated subsurface data from 79 boreholes with a remote sensing analysis to measure channel changes in 1948–2013. We found that closed taliks occurred under the active channel and extended into intrapermafrost cryopeg layers under the riverbed/riverbar and active floodplain. Cryopegs as isolated small pockets were also identified at depths in older terrain units. In the study corridor, we estimated that the likelihood of talik and cryopeg occurrence was predominantly (42.2% of area) low, yet a high likelihood was also identified (27.0% of area). Permafrost growth occurred at a rapid rate in the land exposed following channel migration, likely due to the low and delayed release of latent heat as the freezing front progresses downward in the coarse‐grained soils of increasing salinity but decreasing temperatures. As the deposits keep cooling, ground ice will continue forming therefore increasing furthermore the salinity of the remaining unfrozen soil pore‐water and likely prevent the complete freezeback of the cryopegs developed in relation to channel migration. |
format |
Article in Journal/Newspaper |
author |
Eva Stephani Jeremiah Drage Duane Miller Benjamin M. Jones Mikhail Kanevskiy |
spellingShingle |
Eva Stephani Jeremiah Drage Duane Miller Benjamin M. Jones Mikhail Kanevskiy Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
author_facet |
Eva Stephani Jeremiah Drage Duane Miller Benjamin M. Jones Mikhail Kanevskiy |
author_sort |
Eva Stephani |
title |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_short |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_full |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_fullStr |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_full_unstemmed |
Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska |
title_sort |
taliks, cryopegs, and permafrost dynamics related to channel migration, colville river delta, alaska |
url |
https://doi.org/10.1002/ppp.2046 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Arctic Talik |
geographic_facet |
Arctic Talik |
genre |
Arctic Ice permafrost Alaska |
genre_facet |
Arctic Ice permafrost Alaska |
op_relation |
https://doi.org/10.1002/ppp.2046 |
op_doi |
https://doi.org/10.1002/ppp.2046 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
31 |
container_issue |
2 |
container_start_page |
239 |
op_container_end_page |
254 |
_version_ |
1766338898057756672 |