The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses
Multi-temporal satellite images, field observations and field measurements were used to investigate the mechanisms by which sea ice melts offshore from the Mackenzie River Delta. Satellite data recorded between April and August 1986 were corrected to a map projection and calibrated such that albedo...
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Norwegian Polar Institute
1994
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Online Access: | https://polarresearch.net/index.php/polar/article/view/1968 https://doi.org/10.3402/polar.v13i1.6683 |
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ftjpolarres:oai:journals.openacademia.net:article/1968 2023-05-15T14:24:55+02:00 The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses Dean, K. G. Stringer, W. J. Ahlnäs, K. Searcy, C. Weingartner, T. 1994-01-06 application/pdf https://polarresearch.net/index.php/polar/article/view/1968 https://doi.org/10.3402/polar.v13i1.6683 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/1968/5217 https://polarresearch.net/index.php/polar/article/view/1968 doi:10.3402/polar.v13i1.6683 Copyright (c) 2018 Polar Research Polar Research; Vol. 13 No. 1 (1994): Special issue: Proceedings of the Second Circumpolar Symposium on Remote Sensing of Arctic Environments; 83-94 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1994 ftjpolarres https://doi.org/10.3402/polar.v13i1.6683 2021-11-11T19:11:42Z Multi-temporal satellite images, field observations and field measurements were used to investigate the mechanisms by which sea ice melts offshore from the Mackenzie River Delta. Satellite data recorded between April and August 1986 were corrected to a map projection and calibrated such that albedo and temperature values could be compared. Three stages in the melting of sea ice were identified: flooding (overflows), insolation and melting by warm river water. The albedo values of overflows were as much as 1/7 that of ice values while the albedo of ice decreased by 1/3 over the summer. Approximately two weeks after the overflows develop, sea surface temperatures rise as the river-discharge peaks and becomes the dominant source of energy. By this process, ice removal in the delta regime is initiated two months earlier than adjacent coasts with minimal runoff. However, the net result is only a two-week acceleration of ice removal in the delta region. Article in Journal/Newspaper Arctic Mackenzie river Polar Research Sea ice Polar Research (E-Journal) Mackenzie River Polar Research 13 1 83 94 |
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Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Multi-temporal satellite images, field observations and field measurements were used to investigate the mechanisms by which sea ice melts offshore from the Mackenzie River Delta. Satellite data recorded between April and August 1986 were corrected to a map projection and calibrated such that albedo and temperature values could be compared. Three stages in the melting of sea ice were identified: flooding (overflows), insolation and melting by warm river water. The albedo values of overflows were as much as 1/7 that of ice values while the albedo of ice decreased by 1/3 over the summer. Approximately two weeks after the overflows develop, sea surface temperatures rise as the river-discharge peaks and becomes the dominant source of energy. By this process, ice removal in the delta regime is initiated two months earlier than adjacent coasts with minimal runoff. However, the net result is only a two-week acceleration of ice removal in the delta region. |
format |
Article in Journal/Newspaper |
author |
Dean, K. G. Stringer, W. J. Ahlnäs, K. Searcy, C. Weingartner, T. |
spellingShingle |
Dean, K. G. Stringer, W. J. Ahlnäs, K. Searcy, C. Weingartner, T. The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
author_facet |
Dean, K. G. Stringer, W. J. Ahlnäs, K. Searcy, C. Weingartner, T. |
author_sort |
Dean, K. G. |
title |
The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
title_short |
The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
title_full |
The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
title_fullStr |
The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
title_full_unstemmed |
The influence of river discharge on the thawing of sea ice, Mackenzie River Delta: albedo and temperature analyses |
title_sort |
influence of river discharge on the thawing of sea ice, mackenzie river delta: albedo and temperature analyses |
publisher |
Norwegian Polar Institute |
publishDate |
1994 |
url |
https://polarresearch.net/index.php/polar/article/view/1968 https://doi.org/10.3402/polar.v13i1.6683 |
geographic |
Mackenzie River |
geographic_facet |
Mackenzie River |
genre |
Arctic Mackenzie river Polar Research Sea ice |
genre_facet |
Arctic Mackenzie river Polar Research Sea ice |
op_source |
Polar Research; Vol. 13 No. 1 (1994): Special issue: Proceedings of the Second Circumpolar Symposium on Remote Sensing of Arctic Environments; 83-94 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/1968/5217 https://polarresearch.net/index.php/polar/article/view/1968 doi:10.3402/polar.v13i1.6683 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v13i1.6683 |
container_title |
Polar Research |
container_volume |
13 |
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1 |
container_start_page |
83 |
op_container_end_page |
94 |
_version_ |
1766297369068961792 |