GENERAL CIRCULATION MODELS (GCMs): TOOLS FOR UNDERSTANDING CLIMATE AND WEATHER

General Circulation Models (GCMs) are advanced numerical models that simulate the global climate system by solving physical equations governing atmospheric, oceanic, land surface, and cryospheric processes. Originating from early weather prediction tools, GCMs have evolved into essential instruments for climate research, climate change projections, and impact assessments. These models discretize Earth’s system into grids and compute exchanges of momentum, heat, moisture, and chemical species to represent interactions among climate components. This article examines the foundations, structure, applications, and challenges of GCMs and highlights their critical role in climate science.