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The association between the North Atlantic oscillation and the interannual variability of the tropospheric transport pathways in Western Europe

Orza, J. A. G.; Cabello, M.; Galiano, V.; Vermeulen, Alex LU and Stein, A. F. (2012) AGU Chapman Conference on Advances in Lagrangian Modeling of the Atmosphere In Lagrangian Modeling of the Atmosphere 200. p.127-141
Abstract
The variations in tropospheric transport pathways over a 20 year period, 1990-2009, are studied at six locations in Europe. Three Atlantic (Lisbon, Mace Head, and Cabauw) and three Mediterranean sites (Malaga and Elche in the western part and Lecce in the central Mediterranean) are considered. The work is based on the identification of flow types at each location by robust cluster analysis of the trajectories, the assessment of temporal trends for each advection pattern, and subsequent quantification of the association, at the monthly scale, between the North Atlantic Oscillation (NAO) index (NAOi) and the frequency of occurrence of the identified flows. This exploratory study demonstrates the usefulness of the approach for specific... (More)
The variations in tropospheric transport pathways over a 20 year period, 1990-2009, are studied at six locations in Europe. Three Atlantic (Lisbon, Mace Head, and Cabauw) and three Mediterranean sites (Malaga and Elche in the western part and Lecce in the central Mediterranean) are considered. The work is based on the identification of flow types at each location by robust cluster analysis of the trajectories, the assessment of temporal trends for each advection pattern, and subsequent quantification of the association, at the monthly scale, between the North Atlantic Oscillation (NAO) index (NAOi) and the frequency of occurrence of the identified flows. This exploratory study demonstrates the usefulness of the approach for specific locations in a context where synoptic circulation/weather-type classifications are usually used. A different number of advection pathways were identified at each location. Common features to all the sites were prevalence of westerly flows, strong seasonal variability, and association of the air flow types to known synoptic situations in both phases of the NAO. The degree of association varies strongly with latitude, location within the Mediterranean basin, and closeness to the action centers. Overall, flows reaching Mace Head and Cabauw present stronger association to the NAO, which is substantially reduced at lower latitudes and is not significant at Lisbon. Significant temporal trends are found for northerly flows at Mace Head and Malaga, associated to changes at the beginning of the study period that are also present in the NAOi time series. WSW flows at Mace Head exhibit a steady decreasing trend over the whole period. (Less)
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author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Lagrangian Modeling of the Atmosphere
volume
200
pages
127 - 141
publisher
American Geophysical Union
conference name
AGU Chapman Conference on Advances in Lagrangian Modeling of the Atmosphere
external identifiers
  • wos:000320012300012
  • scopus:84899554916
ISSN
0065-8448
DOI
10.1029/2012GM001315
language
English
LU publication?
no
id
46c5cc2e-9df4-497c-960c-3d11917f80f9 (old id 4623783)
date added to LUP
2014-10-14 14:23:01
date last changed
2017-08-13 04:00:49
@inproceedings{46c5cc2e-9df4-497c-960c-3d11917f80f9,
  abstract     = {The variations in tropospheric transport pathways over a 20 year period, 1990-2009, are studied at six locations in Europe. Three Atlantic (Lisbon, Mace Head, and Cabauw) and three Mediterranean sites (Malaga and Elche in the western part and Lecce in the central Mediterranean) are considered. The work is based on the identification of flow types at each location by robust cluster analysis of the trajectories, the assessment of temporal trends for each advection pattern, and subsequent quantification of the association, at the monthly scale, between the North Atlantic Oscillation (NAO) index (NAOi) and the frequency of occurrence of the identified flows. This exploratory study demonstrates the usefulness of the approach for specific locations in a context where synoptic circulation/weather-type classifications are usually used. A different number of advection pathways were identified at each location. Common features to all the sites were prevalence of westerly flows, strong seasonal variability, and association of the air flow types to known synoptic situations in both phases of the NAO. The degree of association varies strongly with latitude, location within the Mediterranean basin, and closeness to the action centers. Overall, flows reaching Mace Head and Cabauw present stronger association to the NAO, which is substantially reduced at lower latitudes and is not significant at Lisbon. Significant temporal trends are found for northerly flows at Mace Head and Malaga, associated to changes at the beginning of the study period that are also present in the NAOi time series. WSW flows at Mace Head exhibit a steady decreasing trend over the whole period.},
  author       = {Orza, J. A. G. and Cabello, M. and Galiano, V. and Vermeulen, Alex and Stein, A. F.},
  booktitle    = {Lagrangian Modeling of the Atmosphere},
  issn         = {0065-8448},
  language     = {eng},
  pages        = {127--141},
  publisher    = {American Geophysical Union},
  title        = {The association between the North Atlantic oscillation and the interannual variability of the tropospheric transport pathways in Western Europe},
  url          = {http://dx.doi.org/10.1029/2012GM001315},
  volume       = {200},
  year         = {2012},
}