Summer Deep Depressions Increase Over the Eastern North Atlantic

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

doi:10.1029/2023GL104435

Summer Deep Depressions Increase Over the Eastern North Atlantic

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

Water and Climate Risk

Research output: Contribution to Journal › Article › Academic › peer-review

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.

Original language	English
Article number	e2023GL104435
Pages (from-to)	1-9
Number of pages	9
Journal	Geophysical Research Letters
Volume	51
Issue number	5
Early online date	4 Mar 2024
DOIs	https://doi.org/10.1029/2023GL104435
Publication status	Published - 16 Mar 2024

Funding

Two anonymous reviewers largely contributed to improving the manuscript. FDA thanks Paolo Davini for advice and discussion. RV, DC, DF, TH, and PY acknowledge funding from the European Union's H2020 program grant agreement 101003469 (XAIDA).

Funders	Funder number
European Union's H2020	101003469
Horizon 2020 Framework Programme	101003469

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title = "Summer Deep Depressions Increase Over the Eastern North Atlantic",

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.",

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AU - D'Andrea, Fabio

AU - Duvel, Jean‐Philippe

AU - Rivière, Gwendal

AU - Vautard, Robert

AU - Cassou, Christophe

AU - Cattiaux, Julien

AU - Coumou, Dim

AU - Faranda, Davide

AU - Happé, Tamara

AU - Jézéquel, Aglaé

AU - Ribes, Aurelien

AU - Yiou, Pascal

PY - 2024/3/16

Y1 - 2024/3/16

N2 - 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.

AB - 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.

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Summer Deep Depressions Increase Over the Eastern North Atlantic

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Funding

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