Mountain torques and atmospheric oscillations
Theoretical work and general circulation model (GCM) experiments suggest that the midlatitude jet stream's interaction with large‐scale topography can drive intraseasonal oscillations in large‐scale atmospheric circulation patterns. In support of this theory, we present new observational eviden...
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American Geophysical Union
2001
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D86Q26ZX 2023-05-15T14:59:35+02:00 Mountain torques and atmospheric oscillations Lott, François Robertson, Andrew W. Ghil, Michael 2001 https://doi.org/10.7916/D86Q26ZX English eng American Geophysical Union https://doi.org/10.7916/D86Q26ZX Mountains Atmospheric tides Atmosphere Articles 2001 ftcolumbiauniv https://doi.org/10.7916/D86Q26ZX 2019-04-04T08:08:11Z Theoretical work and general circulation model (GCM) experiments suggest that the midlatitude jet stream's interaction with large‐scale topography can drive intraseasonal oscillations in large‐scale atmospheric circulation patterns. In support of this theory, we present new observational evidence that mountain‐induced torques play a key role in 15–30‐day oscillations of the Northern Hemisphere circulation's dominant patterns. The affected patterns include the Arctic Oscillation (AO) and the Pacific‐North‐American (PNA) pattern. Positive torques both accelerate and anticipate the midlatitude westerly winds at these periodicities. Moreover, torque anomalies anticipate the onsets of weather regimes over the Pacific, as well as the break‐ups of hemispheric‐scale regimes. Article in Journal/Newspaper Arctic Columbia University: Academic Commons Arctic Pacific |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Mountains Atmospheric tides Atmosphere |
spellingShingle |
Mountains Atmospheric tides Atmosphere Lott, François Robertson, Andrew W. Ghil, Michael Mountain torques and atmospheric oscillations |
topic_facet |
Mountains Atmospheric tides Atmosphere |
description |
Theoretical work and general circulation model (GCM) experiments suggest that the midlatitude jet stream's interaction with large‐scale topography can drive intraseasonal oscillations in large‐scale atmospheric circulation patterns. In support of this theory, we present new observational evidence that mountain‐induced torques play a key role in 15–30‐day oscillations of the Northern Hemisphere circulation's dominant patterns. The affected patterns include the Arctic Oscillation (AO) and the Pacific‐North‐American (PNA) pattern. Positive torques both accelerate and anticipate the midlatitude westerly winds at these periodicities. Moreover, torque anomalies anticipate the onsets of weather regimes over the Pacific, as well as the break‐ups of hemispheric‐scale regimes. |
format |
Article in Journal/Newspaper |
author |
Lott, François Robertson, Andrew W. Ghil, Michael |
author_facet |
Lott, François Robertson, Andrew W. Ghil, Michael |
author_sort |
Lott, François |
title |
Mountain torques and atmospheric oscillations |
title_short |
Mountain torques and atmospheric oscillations |
title_full |
Mountain torques and atmospheric oscillations |
title_fullStr |
Mountain torques and atmospheric oscillations |
title_full_unstemmed |
Mountain torques and atmospheric oscillations |
title_sort |
mountain torques and atmospheric oscillations |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
https://doi.org/10.7916/D86Q26ZX |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://doi.org/10.7916/D86Q26ZX |
op_doi |
https://doi.org/10.7916/D86Q26ZX |
_version_ |
1766331686697566208 |