- 行业: Weather
- Number of terms: 60695
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
The amount of water left in the soil after it has been saturated and allowed to drain by gravity for 24 hours. See also detention storage, gravitational water, retention storage.
Industry:Weather
That radio broadcast, to all navy ships and merchant ships, on which are given: marine warnings; area forecasts; map analyses and forecasts; surface weather reports; and upper air, aircraft report, and satellite information. See Fleet Broadcast, MERCAST.
Industry:Weather
That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction. See barometric corrections.
Industry:Weather
The amount of energy fixed by photosynthesis over a defined time period.
Industry:Weather
The “solid” portion of the earth, including water masses; the lithosphere plus the hydrosphere. Above the geosphere lies the atmosphere and at the interface between these two regions is found almost all of the biosphere, or zone of life. Compare geoid, equilibrium spheroid.
Industry:Weather
That horizontal wind velocity for which the Coriolis acceleration exactly balances the horizontal pressure force:
where vg is the geostrophic wind, f the Coriolis parameter, k the vertical unit vector, g the acceleration of gravity, ∇p the horizontal del operator with pressure as the vertical coordinate, and z the height of the constant-pressure surface. The geostrophic wind is thus directed along the contour lines on a constant-pressure surface (or along the isobars in a geopotential surface) with low elevations (or low pressure) to the left in the Northern Hemisphere and to the right in the Southern Hemisphere. The speed of the geostrophic wind Vg is given by
where ∂z/∂n is the slope of the isobaric surface normal to the contour lines to the left of the direction of motion in the Northern Hemisphere and to the right in the Southern Hemisphere. The geostrophic wind is defined at every point except along the equator. The validity of this approximation in dynamic theory depends upon the particular context. See geostrophic equilibrium, geostrophic approximation, quasigeostrophic approximation; compare gradient wind.
Industry:Weather
Term used in hydraulics; nappe, the underside of which is not in contact with the overflow structure and is at ambient atmospheric pressure.
Industry:Weather
Term used in remote sensing to represent the vertical projection of the actual flight path of an aerial or space vehicle onto the surface of the earth or other celestial body.
Industry:Weather
That high frequency radio broadcast (in addition to the General Broadcast) to all navy ships and merchant ships in which warnings are given.
Industry:Weather
