AOGCM stands for coupled atmosphere–ocean general circulation model. It combines an atmospheric general circulation model with an oceanic model so the two parts can exchange heat, moisture and momentum.
An atmospheric model represents winds, temperature, pressure, water vapour, clouds and radiation across a three-dimensional grid. An ocean model simulates currents, temperature, salinity and related processes. Coupling them allows the ocean surface and atmosphere to respond to one another instead of treating sea-surface conditions as fixed inputs.
That interaction matters because the ocean stores and transports enormous amounts of heat. It also affects evaporation, clouds, sea ice and carbon exchange. Many AOGCMs include land-surface and sea-ice components as well, making them central tools for climate simulations and projections.
The acronym is easy to confuse with ENSO, which names a climate pattern, or MODIS and LIDAR, which refer to observing technologies. AOGCMs are computational models, not instruments or individual measurements. Early coupled models required artificial flux corrections in some cases; improved physics and resolution have largely reduced that need.