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Meteorology

A database of terms pertaining to the scientific study of the atmosphere.

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Meteorology

Ekman number

Weather; Meteorology

A dimensionless number relating the ratio of eddy viscous forces to Coriolis forces. Explicitly, the vertical Ekman number is [[File:ams2001glos-Ee14.gif

Fluctuation velocity

Weather; Meteorology

The difference between the mean velocity of fluid flow and the instantaneous velocity at a point. For example, [[File:ams2001glos-Ee7.gif

Eddy velocity

Weather; Meteorology

The difference between the mean velocity of fluid flow and the instantaneous velocity at a point. For example, [[File:ams2001glos-Ee7.gif

Eddy flux

Weather; Meteorology

The rate of transfer of a conservative fluid property through a surface by turbulent eddies. In the case of an unchanging mean state, the eddy flux of a property ''S'' in the ''z'' direction is ...

Eddy correlation

Weather; Meteorology

1. The covariance between two variables, associated with turbulent motions. For example, if the overbar represents a mean value, and the prime denotes a deviation from the mean, then ...

Energy density spectrum

Weather; Meteorology

The square of the amplitude of the (complex) Fourier transform of an aperiodic function. Thus, if f(t) is the given function, its Fourier transform is [[File:ams2001glos-Ee21.gif

fog patches

Weather; Meteorology

Small areas of fog of little vertical extent (normally greater than 2 but less than 6 m (6–20 ft)) that reduce horizontal visibility. Stars and the sun may be seen through the patches.

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