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Assessing future changes in tropical cyclone activity in the North Atlantic basin through dynamical downscaling
Albenis Pérez-Alarcón1,2,3, Ricardo M Trigo2,4, Raquel Nieto1,5
1Centro de Investigación Mariña, Universidade de Vigo, Environmental Physics Laboratory (EPhysLab), Campus As Lagoas s/n, 32004 Ourense, Spain.
None:
Projecting future tropical cyclone (TC) activity is challenging due to climate model limitations. In this study, we downscaled the bias-corrected CMIP6 dataset for the medium (SSP2-4.5) and high (SSP5-8.5) emission scenarios by the end of the 21st century (2071-2100) using the Weather Research and Forecasting at 20 km horizontal resolution to investigate future changes in TC activity in the North Atlantic basin (NATL). The results reveal a statistically significant (p < 0.05) reduction in TC density in the tropical and central NATL and in the mean annual TC frequency. Although the average annual number of major hurricanes (category 3+) is projected to increase under the SSP5-8.5 scenario, non-statistically significant signals for a change in TC intensity were detected. Furthermore, despite the discrepancies with some previous studies regarding intensity projections, our findings on TC frequency are consistent with a projected trend toward El Niño-like conditions in the equatorial Pacific Ocean.
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