- 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 line of finite width in the emission spectrum, characteristic of gaseous emission. Emission lines are characterized by their central wavelength, line intensity, and line width.
Industry:Weather
The mass of air pollutants emitted from a source every second, for example, 1 kg s−1 of sulfur dioxide from the top of a smokestack.
Industry:Weather
A catalog or list of each emission source within a region, along with the location and emission height, type of air pollutants emitted, rate of emissions, initial emission characteristics such as buoyancy and initial momentum, and emission schedule if not continuous. Such a catalog often includes anthropogenic sources such as individual point sources from industry including some farming activities, line sources along roads, and area sources associated with quasi-uniform distributions of sources such as houses in a residential neighborhood. Biogenic area sources are also included, such as lawns, parks, farmland, pasture, and forests.
Industry:Weather
For air pollution produced during an industrial process, the ratio of output (air pollutants or other by-product such as waste heat) to some measure of productivity, such as input quantity of fuel or raw materials or amount of final product. As written by the U. S. Environmental Protection Agency, an emission factor is a representative value that attempts to relate the quantity of a pollutant released to the atmosphere with an activity associated with the release of that pollutant. These factors are usually expressed as the weight of pollutant divided by a unit weight, volume, distance, or duration of the activity emitting the pollutant (e.g., kilograms of particulate emitted per megagram of coal burned).
Industry:Weather
A sky of cirrus clouds that are either isolated or in small, separated groups; so called because this formation is often one of the first indications of the approach of a cyclonic storm.
Industry:Weather
With respect to radiation, the generation and sending out of radiant energy. The emission of radiation by natural emitters is accompanied by a loss of energy and is considered separately from the processes of absorption or scattering.
Industry:Weather
A local onshore southwest wind caused by the reversal of the northeast trade winds in the lee of the Canary Islands.
Industry:Weather
An incipient nucleus of many molecular dimensions for the initiation of one phase in another, as ice in supercooled water.
Industry:Weather
An instrument for the measurement of the radon content of the atmosphere. Radon is removed from a sample of air by condensation or adsorption on a surface, and is then placed in an ionization chamber and its activity determined.
Industry:Weather
1. A measure (or condition) of height, especially with respect to the height of a point on the earth's surface above a reference plane (usually mean sea level), as “station elevation. ”
The term altitude (e.g., “high-altitude station”) and the general term “height” are also used in this sense. 2. Same as elevation angle.
Industry:Weather
