Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada
Annual observations of aeolian transport in an arctic proglacial setting indicate that summer transport is minimal when frequent precipitation occurs and water levels are high, but that autumn and winter transport is much more significant than is usually assumed. Strong katabatic winds and low snowf...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.3430010304 |
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ftrepec:oai:RePEc:wly:perpro:v:1:y:1990:i:3-4:p:235-247 2023-05-15T15:16:16+02:00 Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada Cheryl Mckenna Neuman https://doi.org/10.1002/ppp.3430010304 unknown https://doi.org/10.1002/ppp.3430010304 article ftrepec https://doi.org/10.1002/ppp.3430010304 2020-12-04T13:31:25Z Annual observations of aeolian transport in an arctic proglacial setting indicate that summer transport is minimal when frequent precipitation occurs and water levels are high, but that autumn and winter transport is much more significant than is usually assumed. Strong katabatic winds and low snowfall are typical of the winter season, so that bare frozen surfaces contribute grains to the transport load through sublimation and abrasion. During violent winter sandstorms, coarse granules are suspended up to 4 m above the surface and conventional instrumentation grossly underestimates the transport load. Most of the depositional record of this transport is erased during flooding of the sandur in the following season. Relatively light summer winds winnow out the fine fraction of the coarse, poorly to moderately sorted winter aeolian deposits, so that a lag develops on the surface of thin aeolian sand sheets lining the sandur. Des observations annuelles de transport éolien dans un environnement arctique proglaciaire indiquent que le transport d'été est minimal quand des précipitations fréquentes se produisent et quand le niveau de l'eau des riviéres est élevé. En automne et en hiver, le transport éolien est beaucoup plus important qu'on ne le croit habituellement. Des vents catabatiques violents et des faibles précipitations sont typiques pour la saison hivernale de telle sorte que les surfaces nues gelées fournissent des grains á la charge transportée. Pendant les violentes tempětes de sable hivernales, des granules grossiers sont déplacés en suspension á plus de 4 métres au dessus de la surface du sol et les instruments conventionnels sous‐estiment beaucoup la charge transportée. La plus grande partie du dépǒt dǔ á ce transport est effacée pendant l'inondation du sandur au cours de la saison estivale suivante. Des vents d'été relativement légers vannent la fraction fine des dépǒts éoliens hivernaux grossiers et pauvrement ou modérément triés, de telle sorte qu'une couche de sables éoliens fins se développe á la surface de la couverture sableuse qui s'étire le long du sandur. Article in Journal/Newspaper Arctic Arctique* RePEc (Research Papers in Economics) Arctic Canada Crater Lake ENVELOPE(-60.667,-60.667,-62.983,-62.983) Pangnirtung ENVELOPE(-65.707,-65.707,66.145,66.145) Permafrost and Periglacial Processes 1 3-4 235 247 |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
Annual observations of aeolian transport in an arctic proglacial setting indicate that summer transport is minimal when frequent precipitation occurs and water levels are high, but that autumn and winter transport is much more significant than is usually assumed. Strong katabatic winds and low snowfall are typical of the winter season, so that bare frozen surfaces contribute grains to the transport load through sublimation and abrasion. During violent winter sandstorms, coarse granules are suspended up to 4 m above the surface and conventional instrumentation grossly underestimates the transport load. Most of the depositional record of this transport is erased during flooding of the sandur in the following season. Relatively light summer winds winnow out the fine fraction of the coarse, poorly to moderately sorted winter aeolian deposits, so that a lag develops on the surface of thin aeolian sand sheets lining the sandur. Des observations annuelles de transport éolien dans un environnement arctique proglaciaire indiquent que le transport d'été est minimal quand des précipitations fréquentes se produisent et quand le niveau de l'eau des riviéres est élevé. En automne et en hiver, le transport éolien est beaucoup plus important qu'on ne le croit habituellement. Des vents catabatiques violents et des faibles précipitations sont typiques pour la saison hivernale de telle sorte que les surfaces nues gelées fournissent des grains á la charge transportée. Pendant les violentes tempětes de sable hivernales, des granules grossiers sont déplacés en suspension á plus de 4 métres au dessus de la surface du sol et les instruments conventionnels sous‐estiment beaucoup la charge transportée. La plus grande partie du dépǒt dǔ á ce transport est effacée pendant l'inondation du sandur au cours de la saison estivale suivante. Des vents d'été relativement légers vannent la fraction fine des dépǒts éoliens hivernaux grossiers et pauvrement ou modérément triés, de telle sorte qu'une couche de sables éoliens fins se développe á la surface de la couverture sableuse qui s'étire le long du sandur. |
format |
Article in Journal/Newspaper |
author |
Cheryl Mckenna Neuman |
spellingShingle |
Cheryl Mckenna Neuman Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
author_facet |
Cheryl Mckenna Neuman |
author_sort |
Cheryl Mckenna Neuman |
title |
Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
title_short |
Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
title_full |
Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
title_fullStr |
Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
title_full_unstemmed |
Observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, N.W.T., Canada |
title_sort |
observations of winter aeolian transport and niveo‐aeolian deposition at crater lake, pangnirtung pass, n.w.t., canada |
url |
https://doi.org/10.1002/ppp.3430010304 |
long_lat |
ENVELOPE(-60.667,-60.667,-62.983,-62.983) ENVELOPE(-65.707,-65.707,66.145,66.145) |
geographic |
Arctic Canada Crater Lake Pangnirtung |
geographic_facet |
Arctic Canada Crater Lake Pangnirtung |
genre |
Arctic Arctique* |
genre_facet |
Arctic Arctique* |
op_relation |
https://doi.org/10.1002/ppp.3430010304 |
op_doi |
https://doi.org/10.1002/ppp.3430010304 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
1 |
container_issue |
3-4 |
container_start_page |
235 |
op_container_end_page |
247 |
_version_ |
1766346552707645440 |