Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation
The North Atlantic Oscillation (NAO) represents the dominant mode of atmospheric variability in the North Atlantic region. In the present study, the role of the synoptic systems (cyclones and anticyclones) in generating the NAO pattern is investigated. To study the intermonthly variations of the NAO...
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American Meteorological Society, AMS
2005
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Online Access: | https://oceanrep.geomar.de/id/eprint/8082/ https://oceanrep.geomar.de/id/eprint/8082/1/mwr3007.1.pdf https://doi.org/10.1175/MWR3007.1 |
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ftoceanrep:oai:oceanrep.geomar.de:8082 2023-05-15T17:28:14+02:00 Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation Löptien, Ulrike Ruprecht, Eberhard 2005 text https://oceanrep.geomar.de/id/eprint/8082/ https://oceanrep.geomar.de/id/eprint/8082/1/mwr3007.1.pdf https://doi.org/10.1175/MWR3007.1 en eng American Meteorological Society, AMS https://oceanrep.geomar.de/id/eprint/8082/1/mwr3007.1.pdf Löptien, U. and Ruprecht, E. (2005) Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation. Open Access Monthly Weather Review, 133 (10). pp. 2894-2904. DOI 10.1175/MWR3007.1 <https://doi.org/10.1175/MWR3007.1>. doi:10.1175/MWR3007.1 info:eu-repo/semantics/openAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1175/MWR3007.1 2023-04-07T14:56:00Z The North Atlantic Oscillation (NAO) represents the dominant mode of atmospheric variability in the North Atlantic region. In the present study, the role of the synoptic systems (cyclones and anticyclones) in generating the NAO pattern is investigated. To study the intermonthly variations of the NAO, NCEP–NCAR reanalysis data are used, and for the interdecadal variations the results of a 300-yr control integration under present-day conditions of the coupled model ECHAM4/OPYC3 are analyzed. A filtering method is developed for the sea level pressure anomalies. Application of this method to each grid point yields the low-frequency variability in the sea level pressure field that is due to the synoptic systems. The low-frequency variability of the filtered and the original data are in high agreement. This indicates that the low-frequency pressure variability, and with it the variability of the NAO, is essentially caused by the distribution of the synoptic systems. The idea that the distribution of the synoptic systems is the cause of the variation of the NAO is confirmed by high correlation between the latitudinal position of the polar front over the North Atlantic and the NAO index. Since most of the low-frequency variability in sea level pressure can be explained through the distribution of the synoptic systems, the NAO seems to be a reflection of the distribution of the synoptic systems, rather than the source for variations in the cyclone tracks. Article in Journal/Newspaper North Atlantic North Atlantic oscillation OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Monthly Weather Review 133 10 2894 2904 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The North Atlantic Oscillation (NAO) represents the dominant mode of atmospheric variability in the North Atlantic region. In the present study, the role of the synoptic systems (cyclones and anticyclones) in generating the NAO pattern is investigated. To study the intermonthly variations of the NAO, NCEP–NCAR reanalysis data are used, and for the interdecadal variations the results of a 300-yr control integration under present-day conditions of the coupled model ECHAM4/OPYC3 are analyzed. A filtering method is developed for the sea level pressure anomalies. Application of this method to each grid point yields the low-frequency variability in the sea level pressure field that is due to the synoptic systems. The low-frequency variability of the filtered and the original data are in high agreement. This indicates that the low-frequency pressure variability, and with it the variability of the NAO, is essentially caused by the distribution of the synoptic systems. The idea that the distribution of the synoptic systems is the cause of the variation of the NAO is confirmed by high correlation between the latitudinal position of the polar front over the North Atlantic and the NAO index. Since most of the low-frequency variability in sea level pressure can be explained through the distribution of the synoptic systems, the NAO seems to be a reflection of the distribution of the synoptic systems, rather than the source for variations in the cyclone tracks. |
format |
Article in Journal/Newspaper |
author |
Löptien, Ulrike Ruprecht, Eberhard |
spellingShingle |
Löptien, Ulrike Ruprecht, Eberhard Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
author_facet |
Löptien, Ulrike Ruprecht, Eberhard |
author_sort |
Löptien, Ulrike |
title |
Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
title_short |
Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
title_full |
Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
title_fullStr |
Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
title_full_unstemmed |
Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation |
title_sort |
effect of synoptic systems on the variability of the north atlantic oscillation |
publisher |
American Meteorological Society, AMS |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/8082/ https://oceanrep.geomar.de/id/eprint/8082/1/mwr3007.1.pdf https://doi.org/10.1175/MWR3007.1 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://oceanrep.geomar.de/id/eprint/8082/1/mwr3007.1.pdf Löptien, U. and Ruprecht, E. (2005) Effect of Synoptic Systems on the Variability of the North Atlantic Oscillation. Open Access Monthly Weather Review, 133 (10). pp. 2894-2904. DOI 10.1175/MWR3007.1 <https://doi.org/10.1175/MWR3007.1>. doi:10.1175/MWR3007.1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/MWR3007.1 |
container_title |
Monthly Weather Review |
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133 |
container_issue |
10 |
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2894 |
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2904 |
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1766120799921504256 |