Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T.
Field studies have been carried out on two pingos on Tuktoyaktuk Peninsula, N.W.T. One pingo was studied from 1969–1976; the other was studied from 1974–1976. Precise levelling of bench marks in permafrost shows that the tops of these pingos alternately rise and subside in response to the rate of ac...
Published in: | Canadian Journal of Earth Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Canadian Science Publishing
1977
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Online Access: | http://dx.doi.org/10.1139/e77-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-023 |
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crcansciencepubl:10.1139/e77-023 2023-12-17T10:48:32+01:00 Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. Mackay, J. Ross 1977 http://dx.doi.org/10.1139/e77-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-023 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 14, issue 2, page 209-222 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1977 crcansciencepubl https://doi.org/10.1139/e77-023 2023-11-19T13:38:41Z Field studies have been carried out on two pingos on Tuktoyaktuk Peninsula, N.W.T. One pingo was studied from 1969–1976; the other was studied from 1974–1976. Precise levelling of bench marks in permafrost shows that the tops of these pingos alternately rise and subside in response to the rate of accumulation and loss of water beneath them. The water lenses may exceed 50 cm in depth. The high pore water pressure that causes pingo uplift is produced by pore water expulsion adjacent to the pingo, where the thickness of permafrost is 2 to 3 times the pingo height. The pore water pressure beneath the permafrost surrounding the pingo may approach 100% of the lithostatic pressure. When uplift from the water lens exceeds the strength of the pingo, peripheral failure occurs, water escapes as a spring, and the pingo subsides. Pulsating pingos seem characterized by long radial tension cracks which extend far onto the drained lake floor.The pulsation of pingos has also been experimentally achieved by drilling holes through two pingos to release spring flow from subpingo pore water. The field evidence, from precise before-and-after surveys, indicates that the two pingos and their adjacent drained lake floors are virtually 'afloat' on subpermafrost water. Article in Journal/Newspaper permafrost Canadian Science Publishing (via Crossref) Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Tuktoyaktuk Peninsula ENVELOPE(-131.339,-131.339,69.750,69.750) Canadian Journal of Earth Sciences 14 2 209 222 |
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Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Mackay, J. Ross Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
topic_facet |
General Earth and Planetary Sciences |
description |
Field studies have been carried out on two pingos on Tuktoyaktuk Peninsula, N.W.T. One pingo was studied from 1969–1976; the other was studied from 1974–1976. Precise levelling of bench marks in permafrost shows that the tops of these pingos alternately rise and subside in response to the rate of accumulation and loss of water beneath them. The water lenses may exceed 50 cm in depth. The high pore water pressure that causes pingo uplift is produced by pore water expulsion adjacent to the pingo, where the thickness of permafrost is 2 to 3 times the pingo height. The pore water pressure beneath the permafrost surrounding the pingo may approach 100% of the lithostatic pressure. When uplift from the water lens exceeds the strength of the pingo, peripheral failure occurs, water escapes as a spring, and the pingo subsides. Pulsating pingos seem characterized by long radial tension cracks which extend far onto the drained lake floor.The pulsation of pingos has also been experimentally achieved by drilling holes through two pingos to release spring flow from subpingo pore water. The field evidence, from precise before-and-after surveys, indicates that the two pingos and their adjacent drained lake floors are virtually 'afloat' on subpermafrost water. |
format |
Article in Journal/Newspaper |
author |
Mackay, J. Ross |
author_facet |
Mackay, J. Ross |
author_sort |
Mackay, J. Ross |
title |
Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
title_short |
Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
title_full |
Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
title_fullStr |
Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
title_full_unstemmed |
Pulsating pingos, Tuktoyaktuk Peninsula, N.W.T. |
title_sort |
pulsating pingos, tuktoyaktuk peninsula, n.w.t. |
publisher |
Canadian Science Publishing |
publishDate |
1977 |
url |
http://dx.doi.org/10.1139/e77-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/e77-023 |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) ENVELOPE(-131.339,-131.339,69.750,69.750) |
geographic |
Tuktoyaktuk Tuktoyaktuk Peninsula |
geographic_facet |
Tuktoyaktuk Tuktoyaktuk Peninsula |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Canadian Journal of Earth Sciences volume 14, issue 2, page 209-222 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e77-023 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
14 |
container_issue |
2 |
container_start_page |
209 |
op_container_end_page |
222 |
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1785572747592597504 |