Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index
Abstract A westerly index for Europe is developed back to 1692 using newly recovered and corrected Mean Sea‐level Pressure (MSLP) data from London and Paris. The index is compared against various instrumental and proxy indices of the North Atlantic Oscillation (NAO). In the winter, the Paris‐London...
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crwiley:10.1002/joc.3416 2024-06-02T08:11:17+00:00 Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index Cornes, Richard C. Jones, Philip D. Briffa, Keith R. Osborn, Timothy J. 2012 http://dx.doi.org/10.1002/joc.3416 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3416 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3416 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 33, issue 1, page 228-248 ISSN 0899-8418 1097-0088 journal-article 2012 crwiley https://doi.org/10.1002/joc.3416 2024-05-03T12:06:31Z Abstract A westerly index for Europe is developed back to 1692 using newly recovered and corrected Mean Sea‐level Pressure (MSLP) data from London and Paris. The index is compared against various instrumental and proxy indices of the North Atlantic Oscillation (NAO). In the winter, the Paris‐London index depicts a spatial pattern of atmospheric circulation that is bi‐modal, with centres of action that are shifted eastwards compared to the NAO. Owing to asymmetry in the NAO the Paris‐London index provides a good depiction of positive NAO conditions as well as extreme negative phases of the NAO that arise from reversals of the pressure centres, but less extreme negative NAO conditions are associated with westerly index values approaching zero. The merit in using the Paris‐London index lies with its consistency over time as a measure of westerly wind flow, which may not be the case with other proxy‐based indices. In the summer, the Paris‐London index bears a close relationship to the reconstructed high‐summer NAO series of Folland et al. ( 2009 ) as well as the summer Luterbacher et al. ( 1999 ) NAO reconstruction. An important finding is that the summer NAO was highly variable during the early nineteenth century but was predominately positive on the decadal time scale during that period. Since circa 1970 the summer index has mostly been negative, indicating reduced westerlies and increased blocking conditions that are exceptional in the context of the last 250 years. Copyright © 2012 Royal Meteorological Society Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library Folland ENVELOPE(7.471,7.471,63.004,63.004) International Journal of Climatology 33 1 228 248 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract A westerly index for Europe is developed back to 1692 using newly recovered and corrected Mean Sea‐level Pressure (MSLP) data from London and Paris. The index is compared against various instrumental and proxy indices of the North Atlantic Oscillation (NAO). In the winter, the Paris‐London index depicts a spatial pattern of atmospheric circulation that is bi‐modal, with centres of action that are shifted eastwards compared to the NAO. Owing to asymmetry in the NAO the Paris‐London index provides a good depiction of positive NAO conditions as well as extreme negative phases of the NAO that arise from reversals of the pressure centres, but less extreme negative NAO conditions are associated with westerly index values approaching zero. The merit in using the Paris‐London index lies with its consistency over time as a measure of westerly wind flow, which may not be the case with other proxy‐based indices. In the summer, the Paris‐London index bears a close relationship to the reconstructed high‐summer NAO series of Folland et al. ( 2009 ) as well as the summer Luterbacher et al. ( 1999 ) NAO reconstruction. An important finding is that the summer NAO was highly variable during the early nineteenth century but was predominately positive on the decadal time scale during that period. Since circa 1970 the summer index has mostly been negative, indicating reduced westerlies and increased blocking conditions that are exceptional in the context of the last 250 years. Copyright © 2012 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Cornes, Richard C. Jones, Philip D. Briffa, Keith R. Osborn, Timothy J. |
spellingShingle |
Cornes, Richard C. Jones, Philip D. Briffa, Keith R. Osborn, Timothy J. Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
author_facet |
Cornes, Richard C. Jones, Philip D. Briffa, Keith R. Osborn, Timothy J. |
author_sort |
Cornes, Richard C. |
title |
Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
title_short |
Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
title_full |
Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
title_fullStr |
Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
title_full_unstemmed |
Estimates of the North Atlantic Oscillation back to 1692 using a Paris–London westerly index |
title_sort |
estimates of the north atlantic oscillation back to 1692 using a paris–london westerly index |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1002/joc.3416 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3416 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3416 |
long_lat |
ENVELOPE(7.471,7.471,63.004,63.004) |
geographic |
Folland |
geographic_facet |
Folland |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 33, issue 1, page 228-248 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.3416 |
container_title |
International Journal of Climatology |
container_volume |
33 |
container_issue |
1 |
container_start_page |
228 |
op_container_end_page |
248 |
_version_ |
1800757369456558080 |