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Geostrophic Wind Level
The lowest level at which the wind becomes geostrophic
in the theory of the Ekman
, proportional to
Missing Image:img src="SP7-g_files/geostw.gif" alt="geostrophic wind equation" align="middle"
where v is the kinematic eddy viscosity and Missing Image:img src="SP7-g_files/geostw2.gif" alt="lowercase italic rho" align="middle"
the latitude. Also called gradient wind
In practice it is observed that the geostrophic wind level is between
1.2 and 1.6 kilometers, and it is assumed that this marks the upper limit of
frictional influence of the earth's surface. The geostrophic wind level may be
considered to be the top of the Ekman layer
boundary layer, i.e., the
base of the free
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use