Abstract
The climate features over Central America and the Caribbean are simulated with the regional climate model RegCM4 to analyze the performance of the model in reproducing precipitation and temperature patterns over the region. Results from RegCM4 and the driving global climate model (GCM) HadGEM2-ES (HadG) are compared against gridded observations for a period from January 1980 to December 2004 using a perturbed physics ensemble formed by four configurations of the RegCM4 using different combinations of four convection schemes run over land and ocean areas: Kain Fritsch (Kf), Emanuel (Em), Grell (Ge), and Tiedtke (Tk). The added value of RegCM4 relative to the GCM simulation is also estimated, with focus over four subregions, using several metrics calculated on the RegCM4 as well as the GCM grids. The RegCM4 downscaling, expressed by the ensemble mean ENS, adds significant details to the HadG simulation of the temperature field patterns, showing smaller biases of up to ± 1.6 °C at the RCM resolution. Regarding the spatial patterns of precipitation, the HadG has overall higher correlation values with observations than ENS. However, the regional model provides more detailed spatial distributions, decreasing the bias by more than 1 mm/day over some of the islands. It also captures extreme precipitation events that are underestimated in the HadG simulation, even after upscaling to the GCM resolution grid. Concerning the performance of the different RegCM4 convection scheme combinations, KfEm and EmEm show the highest skill values for precipitation, while for temperature TkEm and GeEm are the best performing. This highlights that no individual scheme outperforms the others in all respects, while the application of the averaged ensemble technique provides the best results.
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Acknowledgments
Special thanks to the ICTP “Earth System Physics” (ESP) group for providing the regional climate model RegCM4, access to the “Argo” supercomputer cluster and technical assistance and to the Associateship Program, funded by the Simons Foundation. We also thank the “Caribbean Community Climate Change Centre” (CCCCC) for its support.
Funding
This study was supported by funding from Technology and Environment (CITMA) of Cuba through the project SUPERCLIMA of the Institute of Meteorology of Cuba (INSMET) and the “Sandwich Training Educational Program” (STEP) of the International Centre for Atmospheric Physics (ICTP).
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Vichot-Llano, A., Martinez-Castro, D., Giorgi, F. et al. Comparison of GCM and RCM simulated precipitation and temperature over Central America and the Caribbean. Theor Appl Climatol 143, 389–402 (2021). https://doi.org/10.1007/s00704-020-03400-3
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DOI: https://doi.org/10.1007/s00704-020-03400-3