The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum
Abstract Large glacial lakes, including Glacial Lake Washburn, were present in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum (LGM) despite a colder and drier climate. To address the mechanism capable of generating enough meltwater to sustain these large lakes, a conceptual mod...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/s0954102017000062 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000062 |
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crcambridgeupr:10.1017/s0954102017000062 2024-09-09T19:10:09+00:00 The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum Obryk, M.K. Doran, P.T. Waddington, E.D. Mckay, C.P. 2017 http://dx.doi.org/10.1017/s0954102017000062 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000062 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 29, issue 5, page 457-467 ISSN 0954-1020 1365-2079 journal-article 2017 crcambridgeupr https://doi.org/10.1017/s0954102017000062 2024-06-19T04:04:44Z Abstract Large glacial lakes, including Glacial Lake Washburn, were present in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum (LGM) despite a colder and drier climate. To address the mechanism capable of generating enough meltwater to sustain these large lakes, a conceptual model was developed based on the warming potential of infrequent contemporary föhn winds. The model suggests that föhn winds were capable of generating enough meltwater to sustain large glacial lakes during the LGM by increasing degree days above freezing (DDAF) and prolonging the melt season. A present-day relationship between infrequent summer föhn winds and DDAF was established. It is assumed that the Taylor Dome ice core record represents large-scale palaeoclimatic variations for the McMurdo Dry Valleys region. This analysis suggests that because of the warming influence of the more frequent föhn winds, summer DDAF in the McMurdo Dry Valleys during the LGM were equivalent to present-day values, but this enhanced summer signal is not preserved in the annually averaged ice core temperature record. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica ice core McMurdo Dry Valleys Cambridge University Press Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) McMurdo Dry Valleys Taylor Dome ENVELOPE(157.667,157.667,-77.667,-77.667) Washburn ENVELOPE(-86.133,-86.133,-77.617,-77.617) Antarctic Science 29 5 457 467 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Large glacial lakes, including Glacial Lake Washburn, were present in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum (LGM) despite a colder and drier climate. To address the mechanism capable of generating enough meltwater to sustain these large lakes, a conceptual model was developed based on the warming potential of infrequent contemporary föhn winds. The model suggests that föhn winds were capable of generating enough meltwater to sustain large glacial lakes during the LGM by increasing degree days above freezing (DDAF) and prolonging the melt season. A present-day relationship between infrequent summer föhn winds and DDAF was established. It is assumed that the Taylor Dome ice core record represents large-scale palaeoclimatic variations for the McMurdo Dry Valleys region. This analysis suggests that because of the warming influence of the more frequent föhn winds, summer DDAF in the McMurdo Dry Valleys during the LGM were equivalent to present-day values, but this enhanced summer signal is not preserved in the annually averaged ice core temperature record. |
format |
Article in Journal/Newspaper |
author |
Obryk, M.K. Doran, P.T. Waddington, E.D. Mckay, C.P. |
spellingShingle |
Obryk, M.K. Doran, P.T. Waddington, E.D. Mckay, C.P. The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
author_facet |
Obryk, M.K. Doran, P.T. Waddington, E.D. Mckay, C.P. |
author_sort |
Obryk, M.K. |
title |
The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
title_short |
The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
title_full |
The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
title_fullStr |
The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
title_full_unstemmed |
The influence of föhn winds on Glacial Lake Washburn and palaeotemperatures in the McMurdo Dry Valleys, Antarctica, during the Last Glacial Maximum |
title_sort |
influence of föhn winds on glacial lake washburn and palaeotemperatures in the mcmurdo dry valleys, antarctica, during the last glacial maximum |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/s0954102017000062 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000062 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) ENVELOPE(157.667,157.667,-77.667,-77.667) ENVELOPE(-86.133,-86.133,-77.617,-77.617) |
geographic |
Glacial Lake McMurdo Dry Valleys Taylor Dome Washburn |
geographic_facet |
Glacial Lake McMurdo Dry Valleys Taylor Dome Washburn |
genre |
Antarc* Antarctic Science Antarctica ice core McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Science Antarctica ice core McMurdo Dry Valleys |
op_source |
Antarctic Science volume 29, issue 5, page 457-467 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102017000062 |
container_title |
Antarctic Science |
container_volume |
29 |
container_issue |
5 |
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457 |
op_container_end_page |
467 |
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1809824693409021952 |