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Future changes in winter explosive cyclones over the Southern Hemisphere domains from the CORDEX-CORE ensemble

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Abstract

Future projections in austral winter characteristics of explosive extratropical cyclones (EECs) in three CORDEX Southern Hemisphere domains (Africa-AFR, Australia-AUS and South America-SAM) are investigated. The projections are obtained with a fine resolution (25 km) Regional Climate Model (RegCM4) within the CORDEX-CORE framework driven by three Global Climate Models (GCMs: HadGEM2-ES, MPI-ESM-MR and NorESM-1 M) under the RCP8.5 scenario. The cyclone database was obtained using a tracking scheme applied to 6-hourly mean sea level pressure fields and EECs are selected using the Sanders and Gyakum criterion. EECs represent ~ 13–17% of the total number of extratropical cyclones during austral winter in the ERA-Interim reanalysis (1995–2014), while both GCMs and RegCM4 ensembles underestimate this percentage. The frequency of EECs is projected to increase in AFR and in SAM domains at the end of the twenty-first century. However, the magnitude of the projected changes needs to be considered with caution because it is smaller than the underestimations in the frequency of EECs of both ensembles in the present climate. EECs in the future will be deeper and faster but with a shorter lifetime. Eady Growth Rate composites, when EECs reach the explosive phase, indicate a less baroclinic large-scale environment in the future. On the other hand, the intensification of precipitation associated with EECs in the future indicates an increase in the contribution of the diabatic processes acting to strengthen the local baroclinicity of the EECs.

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AUS and c SAM domains

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The authors declare that all data used in this study are freely available in online repositories described in the methodology.

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Acknowledgements

We thank the international centers that provided data for this study. We also thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and PETROBRAS from Brazil for the financial support. M.Reale has been supported in this work by OGS and CINECA under HPC-TRES award number 2015-07 and by the project FAIRSEA (Fisheries in the Adriatic Region ‐ a Shared Ecosystem. Approach) funded by the 2014 ‐ 2020 Interreg V‐A Italy ‐ Croatia CBC Programme (Standard project ID 10046951).

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Correspondence to Michelle Simões Reboita.

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Reboita, M.S., Crespo, N.M., Torres, J.A. et al. Future changes in winter explosive cyclones over the Southern Hemisphere domains from the CORDEX-CORE ensemble. Clim Dyn 57, 3303–3322 (2021). https://doi.org/10.1007/s00382-021-05867-w

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  • DOI: https://doi.org/10.1007/s00382-021-05867-w

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