Summer Deep Depressions Increase Over the Eastern North Atlantic

Autor: Fabio D'Andrea, Jean‐Philippe Duvel, Gwendal Rivière, Robert Vautard, Christophe Cassou, Julien Cattiaux, Dim Coumou, Davide Faranda, Tamara Happé, Aglaé Jézéquel, Aurelien Ribes, Pascal Yiou
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Geophysical Research Letters, Vol 51, Iss 5, Pp n/a-n/a (2024)
Druh dokumentu: article
ISSN: 1944-8007
0094-8276
DOI: 10.1029/2023GL104435
Popis: Abstract Mid‐tropospheric deep depressions in summer over the North Atlantic are shown to have strongly increased in the eastern and strongly decreased in the western North Atlantic region. This evolution is linked to a change in baroclinicity in the west of the North Atlantic ocean and over the North American coast, likely due to the increased surface temperature there. Deep depressions in the Eastern North Atlantic are linked to a temperature pattern typical of extreme heat events in the region. The same analysis is applied to a sample of CMIP6 model outputs, and no such trends are found. This study suggests a link between the observed increase of summer extreme heat events in the region and the increase of the number of Atlantic depressions. The failure of CMIP6 models to reproduce these events can consequently also reside in an incorrect reproduction of this specific feature of midlatitude atmospheric dynamics.
Databáze: Directory of Open Access Journals
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