The potential vorticity budget of mean winter anomalies /
NCEP reanalyses have been used to compute the climatological isentropic potential vorticity (IPV) budget at the 315K level for 39 winters and for those winters with a North Atlantic Oscillation (NAO) as well as winters with a Pacific/North American (PNA) pattern. The climatology shows two main IPV s...
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ftcanadathes:oai:collectionscanada.gc.ca:QMM.29930 2023-05-15T17:34:01+02:00 The potential vorticity budget of mean winter anomalies / Wang, Yuhui, 1970- Derome, Jacques (advisor) Brunet, Gilbert (advisor) Master of Engineering (Department of Atmospheric and Oceanic Sciences.) 1999 application/pdf http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29930 en eng McGill University alephsysno: 001737927 proquestno: MQ55097 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29930 All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. Physics Atmospheric Science Electronic Thesis or Dissertation 1999 ftcanadathes 2014-02-16T01:06:18Z NCEP reanalyses have been used to compute the climatological isentropic potential vorticity (IPV) budget at the 315K level for 39 winters and for those winters with a North Atlantic Oscillation (NAO) as well as winters with a Pacific/North American (PNA) pattern. The climatology shows two main IPV sources, each being upstream of the two main centers of positive PV on the east coasts of North America and Asia. The results for the winters with a NAO (PNA) anomaly show, in particular, that the mean-winter IPV anomalies associated with these patterns also have upstream sources. The importance of the latter is not as clear as that of the continential sources that maintain the climatological centers. The mean-winter IPV advection that balances the IPV sources/sinks is composed of the advection by the time-mean flow and by the transient eddies (decomposed into high- and low-frequency components), where the former is the dominant component. The latter are found to produce a negative feedback in that they act to reduce the amplitude of the IPV anomaly. For the NAO anomaly, low-frequency transient advection is more important, while high-frequency transient advection is more statistically significant for the PNA anomaly. Both the high and low-frequency advection have comparable contributions in maintaining the climatological distribution of the stationary eddy IPV. Thesis North Atlantic North Atlantic oscillation Theses Canada/Thèses Canada (Library and Archives Canada) Pacific |
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Open Polar |
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Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Physics Atmospheric Science |
spellingShingle |
Physics Atmospheric Science Wang, Yuhui, 1970- The potential vorticity budget of mean winter anomalies / |
topic_facet |
Physics Atmospheric Science |
description |
NCEP reanalyses have been used to compute the climatological isentropic potential vorticity (IPV) budget at the 315K level for 39 winters and for those winters with a North Atlantic Oscillation (NAO) as well as winters with a Pacific/North American (PNA) pattern. The climatology shows two main IPV sources, each being upstream of the two main centers of positive PV on the east coasts of North America and Asia. The results for the winters with a NAO (PNA) anomaly show, in particular, that the mean-winter IPV anomalies associated with these patterns also have upstream sources. The importance of the latter is not as clear as that of the continential sources that maintain the climatological centers. The mean-winter IPV advection that balances the IPV sources/sinks is composed of the advection by the time-mean flow and by the transient eddies (decomposed into high- and low-frequency components), where the former is the dominant component. The latter are found to produce a negative feedback in that they act to reduce the amplitude of the IPV anomaly. For the NAO anomaly, low-frequency transient advection is more important, while high-frequency transient advection is more statistically significant for the PNA anomaly. Both the high and low-frequency advection have comparable contributions in maintaining the climatological distribution of the stationary eddy IPV. |
author2 |
Derome, Jacques (advisor) Brunet, Gilbert (advisor) |
format |
Thesis |
author |
Wang, Yuhui, 1970- |
author_facet |
Wang, Yuhui, 1970- |
author_sort |
Wang, Yuhui, 1970- |
title |
The potential vorticity budget of mean winter anomalies / |
title_short |
The potential vorticity budget of mean winter anomalies / |
title_full |
The potential vorticity budget of mean winter anomalies / |
title_fullStr |
The potential vorticity budget of mean winter anomalies / |
title_full_unstemmed |
The potential vorticity budget of mean winter anomalies / |
title_sort |
potential vorticity budget of mean winter anomalies / |
publisher |
McGill University |
publishDate |
1999 |
url |
http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29930 |
op_coverage |
Master of Engineering (Department of Atmospheric and Oceanic Sciences.) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
alephsysno: 001737927 proquestno: MQ55097 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29930 |
op_rights |
All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
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