Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3
Abstract Preferred structures in the surface pressure variability are investigated in and compared between two 100‐year simulations of the Hadley Centre climate model HadCM3. In the first (control) simulation, the model is forced with pre‐industrial carbon dioxide concentration (1 × CO 2 ) and in th...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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crwiley:10.1002/qj.236 2024-06-02T07:54:45+00:00 Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 Hannachi, A. Turner, A. G. 2008 http://dx.doi.org/10.1002/qj.236 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.236 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.236 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 134, issue 631, page 469-480 ISSN 0035-9009 1477-870X journal-article 2008 crwiley https://doi.org/10.1002/qj.236 2024-05-03T10:57:40Z Abstract Preferred structures in the surface pressure variability are investigated in and compared between two 100‐year simulations of the Hadley Centre climate model HadCM3. In the first (control) simulation, the model is forced with pre‐industrial carbon dioxide concentration (1 × CO 2 ) and in the second simulation the model is forced with doubled CO 2 concentration (2 × CO 2 ). Daily winter (December–January–February) surface pressures over the Northern Hemisphere are analysed. The identification of preferred patterns is addressed using multivariate mixture models. For the control simulation, two significant flow regimes are obtained at 5% and 2.5% significance levels within the state space spanned by the leading two principal components. They show a high pressure centre over the North Pacific/Aleutian Islands associated with a low pressure centre over the North Atlantic, and its reverse. For the 2 × CO 2 simulation, no such behaviour is obtained. At higher‐dimensional state space, flow patterns are obtained from both simulations. They are found to be significant at the 1% level for the control simulation and at the 2.5% level for the 2 × CO 2 simulation. Hence under CO 2 doubling, regime behaviour in the large‐scale wave dynamics weakens. Doubling greenhouse gas concentration affects both the frequency of occurrence of regimes and also the pattern structures. The less frequent regime becomes amplified and the more frequent regime weakens. The largest change is observed over the Pacific where a significant deepening of the Aleutian low is obtained under CO 2 doubling. Copyright © 2008 Royal Meteorological Society Article in Journal/Newspaper aleutian low North Atlantic Aleutian Islands Wiley Online Library Pacific Quarterly Journal of the Royal Meteorological Society 134 631 469 480 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Preferred structures in the surface pressure variability are investigated in and compared between two 100‐year simulations of the Hadley Centre climate model HadCM3. In the first (control) simulation, the model is forced with pre‐industrial carbon dioxide concentration (1 × CO 2 ) and in the second simulation the model is forced with doubled CO 2 concentration (2 × CO 2 ). Daily winter (December–January–February) surface pressures over the Northern Hemisphere are analysed. The identification of preferred patterns is addressed using multivariate mixture models. For the control simulation, two significant flow regimes are obtained at 5% and 2.5% significance levels within the state space spanned by the leading two principal components. They show a high pressure centre over the North Pacific/Aleutian Islands associated with a low pressure centre over the North Atlantic, and its reverse. For the 2 × CO 2 simulation, no such behaviour is obtained. At higher‐dimensional state space, flow patterns are obtained from both simulations. They are found to be significant at the 1% level for the control simulation and at the 2.5% level for the 2 × CO 2 simulation. Hence under CO 2 doubling, regime behaviour in the large‐scale wave dynamics weakens. Doubling greenhouse gas concentration affects both the frequency of occurrence of regimes and also the pattern structures. The less frequent regime becomes amplified and the more frequent regime weakens. The largest change is observed over the Pacific where a significant deepening of the Aleutian low is obtained under CO 2 doubling. Copyright © 2008 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Hannachi, A. Turner, A. G. |
spellingShingle |
Hannachi, A. Turner, A. G. Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
author_facet |
Hannachi, A. Turner, A. G. |
author_sort |
Hannachi, A. |
title |
Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
title_short |
Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
title_full |
Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
title_fullStr |
Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
title_full_unstemmed |
Preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in HadCM3 |
title_sort |
preferred structures in large‐scale circulation and the effect of doubling greenhouse gas concentration in hadcm3 |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1002/qj.236 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.236 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.236 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low North Atlantic Aleutian Islands |
genre_facet |
aleutian low North Atlantic Aleutian Islands |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 134, issue 631, page 469-480 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.236 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
134 |
container_issue |
631 |
container_start_page |
469 |
op_container_end_page |
480 |
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1800743358011801600 |