Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF
Foehn winds are a prominent feature of the McMurdo Dry Valleys (MDVs) climate, and are responsible for periods of strong winds and warming. The foehn mechanism determined from a case study presented in earlier work is shown here to be robust for a set of the MDVs summer foehn events over the 1994–20...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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Language: | English |
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John Wiley & Sons
2014
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-919 https://doi.org/10.1002/qj.2278 |
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ftncar:oai:drupal-site.org:articles_18246 2023-07-30T03:59:11+02:00 Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF Steinhoff, Daniel (author) Bromwich, David (author) Speirs, Johanna (author) McGowan, Hamish (author) Monaghan, Andrew (author) 2014-07-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-919 https://doi.org/10.1002/qj.2278 en eng John Wiley & Sons Quarterly Journal of the Royal Meteorological Society articles:18246 ark:/85065/d7q241t1 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-919 doi:10.1002/qj.2278 Copyright 2014 Royal Meteorological Society. This is the accepted version of the following article: FULL CITE, which has been published in final form at http://dx.doi.org/10.1002/qj.2278 Text article 2014 ftncar https://doi.org/10.1002/qj.2278 2023-07-17T18:14:10Z Foehn winds are a prominent feature of the McMurdo Dry Valleys (MDVs) climate, and are responsible for periods of strong winds and warming. The foehn mechanism determined from a case study presented in earlier work is shown here to be robust for a set of the MDVs summer foehn events over the 1994–2009 period using output from the Polar Weather Research and Forecasting Model (Polar WRF). Gap flow south of the MDVs is evidenced by the positive relationship between the pressure gradient and near-surface wind speed along the gap. Subsequently, mountain waves are generated and result in adiabatic warming and the downward transport of warm air into the MDVs, and differences in mountain wave characteristics depend on the ambient wind direction and the degree of flow nonlinearity. Pressure-driven channelling then brings warm foehn air downvalley. Although a large range of synoptic-scale circulation patterns can drive foehn events, the warmest foehn events are typically associated with blocking highs over the Australian sector of the Southern Ocean, leading to warm air advection over continental Antarctica. The episodic nature of foehn events, and the tenuous connections between such events and interannual modes of climate variability, suggests that intraseasonal variability may be more important for determining their frequency and magnitude. The extraordinarily warm austral summer of 2001/2002 across Antarctica shows that advection of warm maritime air into the continental interior and strong flow aloft result in warm foehn conditions and significant melt for the MDVs. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Southern Ocean Austral McMurdo Dry Valleys Quarterly Journal of the Royal Meteorological Society 140 683 1825 1837 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Foehn winds are a prominent feature of the McMurdo Dry Valleys (MDVs) climate, and are responsible for periods of strong winds and warming. The foehn mechanism determined from a case study presented in earlier work is shown here to be robust for a set of the MDVs summer foehn events over the 1994–2009 period using output from the Polar Weather Research and Forecasting Model (Polar WRF). Gap flow south of the MDVs is evidenced by the positive relationship between the pressure gradient and near-surface wind speed along the gap. Subsequently, mountain waves are generated and result in adiabatic warming and the downward transport of warm air into the MDVs, and differences in mountain wave characteristics depend on the ambient wind direction and the degree of flow nonlinearity. Pressure-driven channelling then brings warm foehn air downvalley. Although a large range of synoptic-scale circulation patterns can drive foehn events, the warmest foehn events are typically associated with blocking highs over the Australian sector of the Southern Ocean, leading to warm air advection over continental Antarctica. The episodic nature of foehn events, and the tenuous connections between such events and interannual modes of climate variability, suggests that intraseasonal variability may be more important for determining their frequency and magnitude. The extraordinarily warm austral summer of 2001/2002 across Antarctica shows that advection of warm maritime air into the continental interior and strong flow aloft result in warm foehn conditions and significant melt for the MDVs. |
author2 |
Steinhoff, Daniel (author) Bromwich, David (author) Speirs, Johanna (author) McGowan, Hamish (author) Monaghan, Andrew (author) |
format |
Article in Journal/Newspaper |
title |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
spellingShingle |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
title_short |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
title_full |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
title_fullStr |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
title_full_unstemmed |
Austral summer foehn winds over the McMurdo dry valleys of Antarctica from Polar WRF |
title_sort |
austral summer foehn winds over the mcmurdo dry valleys of antarctica from polar wrf |
publisher |
John Wiley & Sons |
publishDate |
2014 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-919 https://doi.org/10.1002/qj.2278 |
geographic |
Southern Ocean Austral McMurdo Dry Valleys |
geographic_facet |
Southern Ocean Austral McMurdo Dry Valleys |
genre |
Antarc* Antarctica McMurdo Dry Valleys Southern Ocean |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys Southern Ocean |
op_relation |
Quarterly Journal of the Royal Meteorological Society articles:18246 ark:/85065/d7q241t1 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-919 doi:10.1002/qj.2278 |
op_rights |
Copyright 2014 Royal Meteorological Society. This is the accepted version of the following article: FULL CITE, which has been published in final form at http://dx.doi.org/10.1002/qj.2278 |
op_doi |
https://doi.org/10.1002/qj.2278 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
140 |
container_issue |
683 |
container_start_page |
1825 |
op_container_end_page |
1837 |
_version_ |
1772809911664640000 |