- 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, ...
An effect due to heat sources within a local exhaust enclosure (stack) producing convective air currents with vertical velocities proportional to the rate of heat transferred to the surrounding air and to the height of rise of the heated air. When hot gases rise through a stack, the vertical stack exit velocity is proportional to the square root of the difference in the densities of the heated air column and that of an equal column of the surrounding ambient air.
Industry:Weather
An averaging of data in space or time, designed to compensate for random errors or fluctuations of a scale smaller than that presumed significant to the problem at hand. Thus, for example, a thermometer smooths the temperature reading on the scale of its time constant; the analysis of a sea level weather map smooths the pressure field on a space scale more or less systematically determined by the analyst by taking each pressure as representative not of a point but of an area about the point. See consecutive mean, curve fitting, filtering, bloxam.
Industry:Weather
An aurora that occurs in the sunlit part of the upper atmosphere above the earth's shadow. Sunlit auroras have been observed to extend up to about 1000 km.
Industry:Weather
An atmospheric sounding that indicates a consistent positive change of temperature with height (a temperature inversion) or zero convective available potential energy (CAPE) at any height in the atmosphere. See'' also'' Richardson number, barotropic instability.
Industry:Weather
An atmospheric wave represented in two-dimensional rectangular Cartesian coordinates, in contrast to a wave considered on the spherical earth.
Industry:Weather
An atmospheric tide due to the thermal or gravitational action of the sun. Six- and eight-hour components of small amplitude have been observed. They are primarily thermal in origin. The 12-hour component has by many times the greatest amplitude of any atmospheric tidal component, about 1. 5 mb at the equator and 0. 5 mb in mid-latitudes. This relatively large amplitude is often explained as a resonance effect. The 24-hour component is a thermal tide with great local variability.
Industry:Weather
An arrangement of flags or pennants (by day) and lanterns (by night) displayed on a coastal storm-warning tower.
Industry:Weather
An area of grass-covered and generally treeless plains, with a semiarid climate, which forms a broad belt over southeastern Europe and the southwestern part of the former Soviet Union.
Industry:Weather
