How well CMIP6 models simulate key boundary conditions afecting South American climate? Insights for regional modeling eforts

South America is a large continent with a wide diversity of weather and climate features, including tropical, subtropical and extratropical regimes interacting within a complex landscape. Simulations by global climate models, as well as their downscaling through regional circulation models or statistical methods, are important tools, particularly when assessing the impacts of climate change in the continent. This work evaluates 57 models of the sixth phase of the Coupled Model Intercomparison Project (CMIP6) in their simulation of various spatial patterns and circulation features over South America. Our evaluation aims to provide useful input for the selection of climate models to force regional simulations in South America. Therefore, we focus on spatial fields that are relevant for regional simulations, such as horizontal winds, sea level pressure, sea surface temperature (SST), and moisture and energy fluxes across the domain boundaries. Additionally, we evaluated different circulation features influencing the regional climate of South America that have not been widely evaluated in these models. Several indices are studied to assess the main low-level and upper-level continental-scale circulation patterns, the regional Walker and Hadley cells, the subtropical highs and the boundary SST patterns. Our results show that no single model performs best across all evaluated features, highlighting the importance of in-depth model evaluation for the region concerning the features of interest.

• Autores: Arias Gómez, Paola Andrea; Correa Sánchez, Isabel Cristina; Fita Borrel, Lluís; Martínez Agudelo, John Alejandro; Álvarez Garretón, Camila; Alves, Lincoln Muniz; Boisier, Juan Pablo; Campozano, Lenin; Espinoza, Jhan Carlo; Junquas, Clémentine; Llopart, Marta; Sorensson, Anna A.
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2025
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/46028
• Acceso en línea: https://hdl.handle.net/10495/46028
• Palabra clave: Ejercicio de Simulación; Simulation Exercise; Clima tropical; Tropical climate; Efecto del cambio climático; Climate change impacts; Modelo de simulación; Simulation models; Circulación atmosférica; Atmospheric circulation; http://aims.fao.org/aos/agrovoc/c_7973; http://aims.fao.org/aos/agrovoc/c_13fb5a08; http://aims.fao.org/aos/agrovoc/c_24242; http://aims.fao.org/aos/agrovoc/c_29546; ODS 13: Acción por el Clima. Adoptar medidas urgentes para combatir el cambio climático y sus efectos
• Rights: openAccess
• License: http://creativecommons.org/licenses/by/4.0/