- 行业: Weather
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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, ...
A term long used by astronomers for the degradation of images by the atmosphere.
Industry:Weather
A basic flow that exerts a strong influence upon the direction of movement of disturbances embedded in it. This is the concept of steering in meteorology.
Industry:Weather
A southeasterly wind, particularly a strong wind or gale, for example, the winter southeast storms of the Bay of San Francisco. A specific application to a local wind is the southeaster of Table Bay, South Africa (Table Mountain southeaster). When there are dark clouds over Table Mountain, it is a black southeaster; when there are no clouds, it is a blind southeaster. See Cape doctor.
Industry:Weather
A function that has different constant values over adjacent subintervals; thus it has discontinuities at the ends of each interval. The distribution function of a discrete variate and a histogram have this shape.
Industry:Weather
A positively charged subatomic particle with the same mass and charge magnitude as that of the electron. The electron's antiparticle, the positron was first observed in 1932 in cosmic rays by Carl Anderson using a Wilson cloud chamber.
Industry:Weather
The movement of a cold air mass from its source region; almost invariably applied to a vigorous equatorward thrust of cold polar air, a rapid equatorward movement of the polar front.
Industry:Weather
(Symbol Na. ) A very light, soft, metallic element, atomic number 11, atomic mass 23; one of the most common metals on earth. It is alkaline, very reactive, and, due to its high activity, sodium is almost always found in chemical combination with other elements. It is a major component of minerals, ocean water, and marine aerosol particles. Sodium is present in atomic form in the upper atmosphere due to the ablation of meteors and forms a sodium layer at the approximately 80-km altitude. Sodium has a very strong, yellow, optical transition at 593 nm (sodium D-line). Emission from this line is seen in the airglow, following the reaction of sodium with ozone. The transition has also been used in ground-based lidar sounding applications to detect the passage of gravity waves.
Industry:Weather
(Symbol σ''<sub>t'',''p</sub>''. ) Sigma-t, corrected to the hydrostatic pressure in situ.
Industry:Weather
Climate for periods prior to the development of measuring instruments, including historic and geologic time, for which only proxy climate records are available.
Industry:Weather
An international code used to report the direction of sferics azimuth in terms of bearings from the observing station. See direction finder.
Industry:Weather
