δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada
A study of δ 18 O variations of snow samples taken on traverses across the Devon Island ice cap in June 1971, 1972, and 1973 has shown a difference between the accumulation conditions on the southeast and northwest sides of the ice cap. On the southeast side there is an increasing depletion of 18 O...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1979
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Online Access: | http://dx.doi.org/10.1139/e79-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-126 |
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crcansciencepubl:10.1139/e79-126 2024-09-09T19:31:19+00:00 δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada Koerner, R. Russell, R. D. 1979 http://dx.doi.org/10.1139/e79-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-126 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 16, issue 7, page 1419-1427 ISSN 0008-4077 1480-3313 journal-article 1979 crcansciencepubl https://doi.org/10.1139/e79-126 2024-06-20T04:11:56Z A study of δ 18 O variations of snow samples taken on traverses across the Devon Island ice cap in June 1971, 1972, and 1973 has shown a difference between the accumulation conditions on the southeast and northwest sides of the ice cap. On the southeast side there is an increasing depletion of 18 O in the snow with increasing elevation. This pattern is attributed to the effect of orographic uplift of air masses moving over the ice cap from the southeast, which promotes condensation and precipitation due to adiabatic cooling. On the northwest side of the ice cap there is no evidence of any further depletion of 18 O in snow, neither with increasing distance from the possible moisture source in Baffin Bay to the southeast nor with increasing elevation if the air mass comes from the northwest. In this case condensation is due to isobaric cooling so that precipitation is generally from level cloud bases. The changes inferred for the isotopic composition of the water vapour as it rises up the southeast slope are found to be consistent with its depletion through precipitation under near-equilibrium conditions. It is calculated that approximately 30% of the moisture at sea level on the southeast side of the ice cap and 8% at the top of the ice cap are of local origin. Lower temporal and aerial variabilty of the δ values on the southeast side of the ice cap is attributed to dominance of the Baffin Bay low on that side effecting consistency of storm conditions there.The δ values of ice in the ablation zone on the Sverdrup Glacier show the combined effect of ice movement from the accumulation to the ablation zone and climatic change during the period of movement from cold to warm and back to cold conditions again. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Devon Island glacier* Ice cap Northwest Territories Canadian Science Publishing Northwest Territories Baffin Bay Canada Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Sverdrup Glacier ENVELOPE(-83.271,-83.271,75.679,75.679) Canadian Journal of Earth Sciences 16 7 1419 1427 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A study of δ 18 O variations of snow samples taken on traverses across the Devon Island ice cap in June 1971, 1972, and 1973 has shown a difference between the accumulation conditions on the southeast and northwest sides of the ice cap. On the southeast side there is an increasing depletion of 18 O in the snow with increasing elevation. This pattern is attributed to the effect of orographic uplift of air masses moving over the ice cap from the southeast, which promotes condensation and precipitation due to adiabatic cooling. On the northwest side of the ice cap there is no evidence of any further depletion of 18 O in snow, neither with increasing distance from the possible moisture source in Baffin Bay to the southeast nor with increasing elevation if the air mass comes from the northwest. In this case condensation is due to isobaric cooling so that precipitation is generally from level cloud bases. The changes inferred for the isotopic composition of the water vapour as it rises up the southeast slope are found to be consistent with its depletion through precipitation under near-equilibrium conditions. It is calculated that approximately 30% of the moisture at sea level on the southeast side of the ice cap and 8% at the top of the ice cap are of local origin. Lower temporal and aerial variabilty of the δ values on the southeast side of the ice cap is attributed to dominance of the Baffin Bay low on that side effecting consistency of storm conditions there.The δ values of ice in the ablation zone on the Sverdrup Glacier show the combined effect of ice movement from the accumulation to the ablation zone and climatic change during the period of movement from cold to warm and back to cold conditions again. |
format |
Article in Journal/Newspaper |
author |
Koerner, R. Russell, R. D. |
spellingShingle |
Koerner, R. Russell, R. D. δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
author_facet |
Koerner, R. Russell, R. D. |
author_sort |
Koerner, R. |
title |
δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
title_short |
δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
title_full |
δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
title_fullStr |
δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
title_full_unstemmed |
δ 18 O variations in snow on the Devon Island ice cap, Northwest Territories, Canada |
title_sort |
δ 18 o variations in snow on the devon island ice cap, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1979 |
url |
http://dx.doi.org/10.1139/e79-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-126 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) ENVELOPE(-83.271,-83.271,75.679,75.679) |
geographic |
Northwest Territories Baffin Bay Canada Devon Island Sverdrup Glacier |
geographic_facet |
Northwest Territories Baffin Bay Canada Devon Island Sverdrup Glacier |
genre |
Baffin Bay Baffin Bay Baffin Devon Island glacier* Ice cap Northwest Territories |
genre_facet |
Baffin Bay Baffin Bay Baffin Devon Island glacier* Ice cap Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 16, issue 7, page 1419-1427 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e79-126 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
16 |
container_issue |
7 |
container_start_page |
1419 |
op_container_end_page |
1427 |
_version_ |
1809900210774605824 |