Future projections in tropical cyclone activity over multiple CORDEX domains from RegCM4 CORDEX-CORE simulations

The characteristics of tropical cyclone (TC) activity over five TC basins lying within four Coordinated Regional Downscaling Experiment (CORDEX) domains are examined for present and future climate conditions using a new ensemble simulations completed as part the CORDEX-CORE initiative with regional model RegCM4. conducted at 25 km horizontal grid spacing driven by three CMIP5 general circulation models (GCMs) under two Representative Concentration Pathways (RCP2.6 RCP8.5). RegCM4 captures most features observed climatology, except intensity, which is thus statistically adjusted bias correction procedure to account effect coarse resolution. exhibits an improved simulation several statistics compared driving GCMs, analyzed. In we find significant increases in frequency North Indian Ocean, Northwest Pacific Eastern regions, consistent increase mid-tropospheric relative humidity. Atlantic Australasia regions show decrease frequency, mostly associated wind shear. We also storm rainfall rates TCs intense domains. Our study shows robust responses often, but not always, line previous studies, still implying presence uncertainties projection characteristics, need be addressed large ensembles high-resolution models.