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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/esd-2017-106
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
21 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Dynamics (ESD).
Euro-Atlantic winter storminess and precipitation extremes under 1.5 °C versus 2 °C warming scenarios
Monika J. Barcikowska1, Scott J. Weaver2, Frauke Feser3, Simone Russo4, Frederik Schenk5, Dáithí A. Stone6,7, and Matthias Zahn3 1Environmental Defense Fund, New York City, United States
2Environmental Defense Fund, Washington, D.C, United States
3Institute of Coastal Research, Helmholtz Centre Geesthacht, Geesthacht, German
4European Commission, Joint Research Centre, Via Enrico Fermi, Ispra, Italy
5Bolin Centre for Climate Research, Department of Geological Sciences, Stockholm University, Stockholm, Sweden
6Lawrence Berkeley National Laboratory, Berkeley, CA, USA
7Global Climate Adaptation Partnership, UK
Abstract. Severe winter storms in combination with precipitation extremes pose a serious threat to Europe. Located at the south-east exit of the North Atlantic's storm track, European coastlines are directly exposed to impacts by high wind speeds, storm floods and coastal erosion. In this study we analyze potential changes in simulated winter storminess and extreme precipitation which may occur under 1.5 °C or 2 °C warming scenarios. Here we focus on a first simulation suite of the atmospheric model CAM5 performed within the HAPPI project and evaluate how changes of the horizontal model resolution impact the results regarding atmospheric pressure, storm tracks, wind speed and precipitation extremes.

The comparison of CAM5 simulations with different resolution indicates that an increased horizontal resolution to 0.25° is not only refining regional-scale information, but also improves large-scale atmospheric circulation features over the Euro-Atlantic region. The zonal bias in SLP and wind fields, which is typically found in low-resolution models, is considerably reduced. This allows us to analyze potential changes in regional- to local-scale extreme wind speeds and precipitation in a more realistic way. Our analysis of the future response for the 2 °C warming scenario generally confirms previous model simulations suggesting a poleward shift and intensification of the meridional circulation the Euro-Atlantic region. Additional analysis suggests that this shift occurs mainly after exceeding the 1.5 °C global warming level, when the midltatitude jetstream manifests a strengthening north-eastward. At the same time, this north-east shift of the storm tracks allows an intensification and north-east expansion of the Azores high leading to a tendency of less precipitation across the Bay of Biscay and North Sea.

Regions impacted by the strengthening of the midlatitude jet, such as the northwest coasts of British Isles, Scandinavia and the Norwegian Sea, and over the North Atlantic east from Newfoundland experience an increase in the mean as well as daily and sub daily precipitation and wind extremes and storminess suggesting an important influence of increasing storm activity in these regions in response to global warming.


Citation: Barcikowska, M. J., Weaver, S. J., Feser, F., Russo, S., Schenk, F., Stone, D. A., and Zahn, M.: Euro-Atlantic winter storminess and precipitation extremes under 1.5 °C versus 2 °C warming scenarios, Earth Syst. Dynam. Discuss., https://doi.org/10.5194/esd-2017-106, in review, 2017.
Monika J. Barcikowska et al.
Monika J. Barcikowska et al.
Monika J. Barcikowska et al.

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