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Spatio-temporal patterns of pressure over the North Atlantic

✍ Scribed by Sílvia Antunes; Oliveira Pires; Alfredo Rocha

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
406 KB
Volume
30
Category
Article
ISSN
0899-8418

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✦ Synopsis

Abstract

The North Atlantic mean sea level pressure field variability is analysed. A space–time study is performed using multichannel singular spectral analysis, allowing the detection of significant space–time modes of variability with periodicity behaviour. It is shown that there is a space variability associated with the time variability of the pressure field. The oscillation is not quasi‐meridional but has different orientations, rotating in a cycle, with a periodicity of about 9 years, from the positive North Atlantic oscillation (NAO) phase through the negative NAO phase and again to the positive phase. This periodicity behaviour was previously detected in the temporal principal components extracted from a principal component analysis but, in the time domain, it was found as not significant. Furthermore, the analysis of a long series of an NAO index had already revealed similar periodicity behaviour. Copyright © 2009 Royal Meteorological Society

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