Point source

From Glossary of Meteorology

point source

  1. With respect to radiation, a single point in space emitting radiation.

    The radiation from such a source may be expressed as flux per unit solid angle (W sr-1).

  2. In experimental studies of atmospheric turbulence and diffusion, a source of particulate matter from a single fixed point.

    There are continuous and instantaneous point sources. The analogous concepts of line source and plane source are also frequently encountered.

  3. In hydrodynamics, a source of mass, that is, a singular point in the field where the equation of continuity fails.