### Rossby number

**(Ro, Kibel number)**
(ratio of inertial to Coriolis force)

The **Rossby number** (**Ro**) is a dimensionless number consisting of
the ratio of inertial (e.g., centrifugal) force to Coriolis force.
It is used in modeling atmosphere and ocean dynamics.
It is defined as:

Ro = U / Lf

- U - characteristic velocity scale
- L - characteristic length scale
- f = 2 Ω sin φ - the Coriolis frequency where Ω is the angular frequency of rotation and φ is the latitude.

The **convective Rossby number**, of interest in the study
of convection in stars and planets and the resulting dynamos,
is the ratio of a buoyancy force to the Coriolis force.

(*fluid dynamics,measure,atmosphere*)
http://en.wikipedia.org/wiki/Rossby_number

**Referenced by:**

Rossby radius of deformation

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