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Past long-term summer warming over western Europe in new generation climate models: Role of large-scale atmospheric circulation

Past long-term summer warming over western Europe in new generation climate models: Role of large-scale atmospheric circulation
Past long-term summer warming over western Europe in new generation climate models: Role of large-scale atmospheric circulation
Past studies have concluded that climate models of previous generations tended to underestimate the large warming trend that has been observed in summer over western Europe in the last few decades. The causes of this systematic error are still not clear. Here, we investigate this issue with a new generation of climate models and systematically explore the role of large-scale circulation in that context.

As an ensemble, climate models in this study warm less over western Europe and warm more over eastern Europe than observed on the 1951–2014 period, but it is difficult to conclude this is directly due to systematic errors given the large potential impact of internal variability. These differences in temperature trends are explained to an important extent by an anti-correlation of sea level pressure trends over the North Atlantic / Europe domain between models and observations. The observed trend tends to warm (cool) western (eastern) Europe but the simulated trends generally have the opposite effect, both in new generation and past generation climate models. The differences between observed and simulated sea level pressure trends are likely the result of systematic model errors, which might also impact future climate projections. Neither a higher resolution nor the realistic representation of the evolution of sea surface temperature and sea ice leads to a better simulation of sea level pressure trends.
1748-9326
Boé, Julien
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Terray, Laurent
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Moine, Marie-pierre
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Valcke, Sophie
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Bellucci, Alessio
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Drijfhout, Sybren
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Haarsma, Rein
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Lohmann, Katja
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Putrasahan, Dian A.
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Roberts, Chris
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Roberts, Malcom
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Scoccimarro, Enrico
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Seddon, Jon
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Senan, Retish
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Wyser, Klaus
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Boé, Julien
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Terray, Laurent
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Moine, Marie-pierre
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Valcke, Sophie
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Bellucci, Alessio
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Drijfhout, Sybren
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Haarsma, Rein
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Lohmann, Katja
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Putrasahan, Dian A.
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Roberts, Chris
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Roberts, Malcom
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Scoccimarro, Enrico
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Seddon, Jon
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Senan, Retish
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Wyser, Klaus
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Boé, Julien, Terray, Laurent, Moine, Marie-pierre, Valcke, Sophie, Bellucci, Alessio, Drijfhout, Sybren, Haarsma, Rein, Lohmann, Katja, Putrasahan, Dian A., Roberts, Chris, Roberts, Malcom, Scoccimarro, Enrico, Seddon, Jon, Senan, Retish and Wyser, Klaus (2020) Past long-term summer warming over western Europe in new generation climate models: Role of large-scale atmospheric circulation. Environmental Research Letters, 15 (8), [084038]. (doi:10.1088/1748-9326/ab8a89).

Record type: Article

Abstract

Past studies have concluded that climate models of previous generations tended to underestimate the large warming trend that has been observed in summer over western Europe in the last few decades. The causes of this systematic error are still not clear. Here, we investigate this issue with a new generation of climate models and systematically explore the role of large-scale circulation in that context.

As an ensemble, climate models in this study warm less over western Europe and warm more over eastern Europe than observed on the 1951–2014 period, but it is difficult to conclude this is directly due to systematic errors given the large potential impact of internal variability. These differences in temperature trends are explained to an important extent by an anti-correlation of sea level pressure trends over the North Atlantic / Europe domain between models and observations. The observed trend tends to warm (cool) western (eastern) Europe but the simulated trends generally have the opposite effect, both in new generation and past generation climate models. The differences between observed and simulated sea level pressure trends are likely the result of systematic model errors, which might also impact future climate projections. Neither a higher resolution nor the realistic representation of the evolution of sea surface temperature and sea ice leads to a better simulation of sea level pressure trends.

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Accepted/In Press date: 17 April 2020
Published date: 7 August 2020

Identifiers

Local EPrints ID: 452131
URI: http://eprints.soton.ac.uk/id/eprint/452131
ISSN: 1748-9326
PURE UUID: 7e0c1a9c-70d0-4f98-bdf4-2fa15bdb2893

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Date deposited: 25 Nov 2021 17:45
Last modified: 09 Jan 2022 01:50

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Contributors

Author: Julien Boé
Author: Laurent Terray
Author: Marie-pierre Moine
Author: Sophie Valcke
Author: Alessio Bellucci
Author: Rein Haarsma
Author: Katja Lohmann
Author: Dian A. Putrasahan
Author: Chris Roberts
Author: Malcom Roberts
Author: Enrico Scoccimarro
Author: Jon Seddon
Author: Retish Senan
Author: Klaus Wyser

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