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Summer North Atlantic Oscillation (SNAO) variability on decadal to palaeoclimate time scales

Magazine article
Authors Hans Linderholm
Chris K. Folland
Published in CLIVAR Exchanges
Volume 72
Pages 57-60
ISSN 1026-0471
Publication year 2017
Published at Department of Earth Sciences
Pages 57-60
Language en
Links dx.doi.org/10.22498/pages.25.1.57
www.clivar.org/documents/clivar-exc...
Subject categories Climate Research, Earth and Related Environmental Sciences

Abstract

The influence of the North Atlantic Oscillation (NAO) on climate in the North Atlantic region has been highlighted over the past few decades. Although most prominent during winter, the NAO is one of the few modes of variability that persist throughout the year, although there are systematic differences in its configuration through the seasons (Barnston and Livezey, 1987). This is related to seasonal variations of the North Atlantic jet stream which on average moves northwards in summer relative to winter. Consequently, the positive and negative nodes of the dipole NAO pattern have more northerly positions during summer. Until recently, most studies of the link between the NAO and climate have focused on winter, but after a thorough study of the summer NAO (SNAO) by Folland et al. (2009, henceforth F09), attention has also been directed to summer.

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