Subgrid-scale process

From Glossary of Meteorology

subgrid-scale process

Atmospheric processes that cannot be adequately resolved within a numerical simulation.

Examples can include turbulent fluxes, phase changes of water, chemical reactions, and radiative flux divergence. Such processes are often parameterized in numerical integrations and even neglected in some applications.
See parameterization, convective adjustment, Mellor–Yamada parameterization, shallow convection parameterization.