- 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, ...
A general term that refers to a groundwater flow boundary, usually induced by groundwater pumping, that significantly impedes the movement of dissolved contaminants.
Industry:Weather
A general class of radar display or indicator in which echoes from targets are presented as areas of light with intensity, brilliance, or color normally a function of the power of the target signal. These indicators usually show the position of a target in terms of spatial coordinates. B-scopes, PPI scopes, and RHI scopes are intensity modulated. See intensity modulation.
Industry:Weather
A freeze in which seasonal vegetation is destroyed, the ground surface is frozen solid underfoot, and heavy ice is formed on small water surfaces such as puddles and water containers. It is to be distinguished from a hard frost (black frost).
Industry:Weather
A four-port waveguide device used in microwave circuits having the property that a signal incident at one port is divided equally between two other ports, provided that the fourth port is terminated by a matched load. A particular type of hybrid, known as a 90° hybrid, yields outputs that differ in phase by 90°.
Industry:Weather
A form of tabular iceberg found in the Arctic Ocean, with a thickness of 30–50 m and from a few thousand square meters to 500 km2 in area. Ice islands often have an undulated surface, which gives them a ribbed appearance from the air.
Industry:Weather
A form of psychrometer with wet- and dry-bulb thermometers mounted on opposite edges of a specially designed graph of the psychrometric tables. It is so arranged that the intersections of two curves determined by the wet- and dry-bulb readings yield the relative humidity, dewpoint, and absolute humidity.
Industry:Weather
A form of high-pressure liquid chromatography using a conductivity detector where a combination of weak ionic solvents are used to separate anions and cations of a solution, with the contribution of the solvent to conductivity suppressed just prior to detection. The technique is useful for measuring anions such as sulfate, nitrate, and chloride in hydrometeors.
Industry:Weather
A fall in the temperature of an animal body below the usual level. This state is brought about when the homeostatic mechanisms fail to maintain adequate production of heat under conditions of extreme cold.
Industry:Weather
A form of degree-day used as an indication of fuel consumption; in U. S. Usage, one heating degree-day is given for each degree that the daily mean temperature departs below the base of 65°F (where degrees Celsius are used, the base is usually 19°C). In accumulating degree-days over a “heating season,” days on which the mean temperature exceeds 65°F are ignored. See cooling degree-day.
Industry:Weather
A forecast based on the supposition that the initial conditions of weather and its elements will persist throughout the entire period of the forecast.
Industry:Weather
