Fr.: nombre de Rossby
A dimensionless number relating the ratio of inertial to Coriolis forces for a given flow of a rotating fluid. It is used in the study of atmospheric motions in planets. In case a small number is involved, cyclones and anticyclones are observed for low and high pressures. When it is large (Venus) the Coriolis force becomes negligible and atmospheric motions are barely affected by planetary rotation.
Named after Carl-Gustav Arvid Rossby (1898-1957), a Swedish-American meteorologist who first explained the large-scale motions of the atmosphere in terms of fluid mechanics; → number.
Fr.: paramètre de Rossby
The northward variation of the Coriolis parameter, arising from the sphericity of the Earth.
Fr.: onde de Rossby
A wave on a uniform current in a two-dimensional non-divergent fluid system, rotating with varying angular speed about the local vertical.