Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica
The meteorological characteristics and hydrological response of an extreme warm, and cold summer in the McMurdo Dry Valleys are compared. The driver behind the warmer summer conditions was the occurrence of down-valley winds, which were not present during the colder summer. Occurrence of the summer...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geog_fac-1005 2023-05-15T13:58:46+02:00 Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica Doran, Peter T. McKay, Christopher P. Fountain, Andrew G. Nylen, Thomas H. McKnight, Diane M. Jaros, Chris Barrett, John E. 2008-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geog_fac/6 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1005&context=geog_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geog_fac/6 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1005&context=geog_fac Geography Faculty Publications and Presentations Paleoclimatology -- Antarctica -- McMurdo Dry Valleys Glacial climates -- Antarctica Glacial landforms -- Antarctica Hydrologic cycle -- Climatic factors -- Antarctica Environmental Sciences Glaciology text 2008 ftportlandstate 2022-01-09T19:25:32Z The meteorological characteristics and hydrological response of an extreme warm, and cold summer in the McMurdo Dry Valleys are compared. The driver behind the warmer summer conditions was the occurrence of down-valley winds, which were not present during the colder summer. Occurrence of the summer down-valley winds coincided with lower than typical mean sea level pressure in the Ross Sea region. There was no significant difference in the amount of solar radiation received during the two summers. Compared to the cold summer, glaciological and hydrological response to the warm summer in Taylor Valley included significant glacier mass loss, and 3- to nearly 6000-fold increase in annual streamflow. Lake levels decreased slightly during the cold summer, and increased between 0.54 and 1.01 m during the warm summer, effectively erasing the prior 14 years of lake level lowering in a period of three months. Lake level rise during the warm summer was shown to be strongly associated with and increase in degree days above freezing at higher elevations. We suggest that strong summer down-valley winds may have been responsible for the generation of large glacial lakes during the Last Glacial Maximum when ice core records recorded annual temperatures significantly colder than present. Text Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys Ross Sea Portland State University: PDXScholar East Antarctica Ross Sea McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) |
institution |
Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
Paleoclimatology -- Antarctica -- McMurdo Dry Valleys Glacial climates -- Antarctica Glacial landforms -- Antarctica Hydrologic cycle -- Climatic factors -- Antarctica Environmental Sciences Glaciology |
spellingShingle |
Paleoclimatology -- Antarctica -- McMurdo Dry Valleys Glacial climates -- Antarctica Glacial landforms -- Antarctica Hydrologic cycle -- Climatic factors -- Antarctica Environmental Sciences Glaciology Doran, Peter T. McKay, Christopher P. Fountain, Andrew G. Nylen, Thomas H. McKnight, Diane M. Jaros, Chris Barrett, John E. Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
topic_facet |
Paleoclimatology -- Antarctica -- McMurdo Dry Valleys Glacial climates -- Antarctica Glacial landforms -- Antarctica Hydrologic cycle -- Climatic factors -- Antarctica Environmental Sciences Glaciology |
description |
The meteorological characteristics and hydrological response of an extreme warm, and cold summer in the McMurdo Dry Valleys are compared. The driver behind the warmer summer conditions was the occurrence of down-valley winds, which were not present during the colder summer. Occurrence of the summer down-valley winds coincided with lower than typical mean sea level pressure in the Ross Sea region. There was no significant difference in the amount of solar radiation received during the two summers. Compared to the cold summer, glaciological and hydrological response to the warm summer in Taylor Valley included significant glacier mass loss, and 3- to nearly 6000-fold increase in annual streamflow. Lake levels decreased slightly during the cold summer, and increased between 0.54 and 1.01 m during the warm summer, effectively erasing the prior 14 years of lake level lowering in a period of three months. Lake level rise during the warm summer was shown to be strongly associated with and increase in degree days above freezing at higher elevations. We suggest that strong summer down-valley winds may have been responsible for the generation of large glacial lakes during the Last Glacial Maximum when ice core records recorded annual temperatures significantly colder than present. |
format |
Text |
author |
Doran, Peter T. McKay, Christopher P. Fountain, Andrew G. Nylen, Thomas H. McKnight, Diane M. Jaros, Chris Barrett, John E. |
author_facet |
Doran, Peter T. McKay, Christopher P. Fountain, Andrew G. Nylen, Thomas H. McKnight, Diane M. Jaros, Chris Barrett, John E. |
author_sort |
Doran, Peter T. |
title |
Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
title_short |
Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
title_full |
Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
title_fullStr |
Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
title_full_unstemmed |
Hydrologic Response to Extreme Warm and Cold Summers in the McMurdo Dry Valleys, East Antarctica |
title_sort |
hydrologic response to extreme warm and cold summers in the mcmurdo dry valleys, east antarctica |
publisher |
PDXScholar |
publishDate |
2008 |
url |
https://pdxscholar.library.pdx.edu/geog_fac/6 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1005&context=geog_fac |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
East Antarctica Ross Sea McMurdo Dry Valleys Taylor Valley |
geographic_facet |
East Antarctica Ross Sea McMurdo Dry Valleys Taylor Valley |
genre |
Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys Ross Sea |
genre_facet |
Antarc* Antarctica East Antarctica ice core McMurdo Dry Valleys Ross Sea |
op_source |
Geography Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geog_fac/6 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1005&context=geog_fac |
_version_ |
1766267104556744704 |