The Influence of Föhn Winds on Glacial Lake Washburn and Palaeotemperatures in the McMurdo Dry Valleys, Antarctica, During the Last Glacial Maximum
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 de...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1112 2023-05-15T13:52:19+02:00 The Influence of Föhn Winds on Glacial Lake Washburn and Palaeotemperatures in the McMurdo Dry Valleys, Antarctica, During the Last Glacial Maximum Obryk, Maciej Doran, Peter Waddington, Ed McKay, Chris 2017-03-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/112 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1112&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/112 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1112&context=geology_fac Geology Faculty Publications and Presentations McMurdo Dry Valleys (Antarctica) -- Environmental conditions Evolutionary paleoecology -- Antarctica Paleoclimatology --Antarctica Antarctica -- Hydrologic models Föhn Geology text 2017 ftportlandstate 2022-01-09T19:44:23Z 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. © Antarctic Science Ltd 2017 Text Antarc* Antarctic Antarctica ice core McMurdo Dry Valleys Portland State University: PDXScholar Antarctic 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) |
institution |
Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
McMurdo Dry Valleys (Antarctica) -- Environmental conditions Evolutionary paleoecology -- Antarctica Paleoclimatology --Antarctica Antarctica -- Hydrologic models Föhn Geology |
spellingShingle |
McMurdo Dry Valleys (Antarctica) -- Environmental conditions Evolutionary paleoecology -- Antarctica Paleoclimatology --Antarctica Antarctica -- Hydrologic models Föhn Geology Obryk, Maciej Doran, Peter Waddington, Ed McKay, Chris The Influence of Föhn Winds on Glacial Lake Washburn and Palaeotemperatures in the McMurdo Dry Valleys, Antarctica, During the Last Glacial Maximum |
topic_facet |
McMurdo Dry Valleys (Antarctica) -- Environmental conditions Evolutionary paleoecology -- Antarctica Paleoclimatology --Antarctica Antarctica -- Hydrologic models Föhn Geology |
description |
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. © Antarctic Science Ltd 2017 |
format |
Text |
author |
Obryk, Maciej Doran, Peter Waddington, Ed McKay, Chris |
author_facet |
Obryk, Maciej Doran, Peter Waddington, Ed McKay, Chris |
author_sort |
Obryk, Maciej |
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 |
PDXScholar |
publishDate |
2017 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/112 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1112&context=geology_fac |
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 |
Antarctic Glacial Lake McMurdo Dry Valleys Taylor Dome Washburn |
geographic_facet |
Antarctic Glacial Lake McMurdo Dry Valleys Taylor Dome Washburn |
genre |
Antarc* Antarctic Antarctica ice core McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica ice core McMurdo Dry Valleys |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/112 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1112&context=geology_fac |
_version_ |
1766256595778404352 |