- 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, ...
In a radiosonde observation, a level (other than a mandatory level) for which values of pressure, temperature, and humidity are reported because temperature and/or moisture- content data at that level are sufficiently important or unusual to warrant the attention of the forecaster, or they are required for the reasonably accurate reproduction of the radiosonde observation. There are definite rules governing the selection of significant levels, set forth in the Manual of Radiosonde Observations, WBAN Circular P, 7th ed. Rev. , 1957.
Industry:Weather
In an elementary chemical reaction, the reaction order is the number of species that actually participate in the reaction. In a complex reaction scheme, the overall apparent reaction order may be fractional or may change with time.
Industry:Weather
In an electromagnetic wave, the rate of power flow in a specific direction at a particular point in a transmission medium, expressed as energy per unit time (power, or radiant flux) per unit cross-sectional area normal to the direction of propagation. The power density generally diminishes with increasing distance from the source as a result of absorption, reflection, scattering, and possibly other effects, as well as geometric spreading of the beam. For surfaces or objects that intercept the radiation at a sufficiently long distance from the source, the propagating energy may be regarded as plane-wave or parallel-beam radiation. Then the power density is the same as the irradiance at a surface normal to the beam.
Industry:Weather
In air navigation, wind direction and speed, either observed or forecast if so specified, at a designated altitude over a fixed location. Compare track wind, sector wind.
Industry:Weather
In air navigation, a method of pressure-pattern flight utilizing a single value of drift-correction angle applied to an entire flight from point of origin to destination. The value is based upon a forecast of mean wind velocity en route. See multiple drift correction; Compare aerologation, single-heading navigation.
Industry:Weather
In Ahlmann's glacier classification, a polar glacier with 10–20 m of firn in the accumulation area where some melting occurs.
Industry:Weather
In Ahlmann's glacier classification, a glacier with an accumulation area covered by firn and with subsurface temperatures below freezing throughout the year. The two subtypes are the high polar glacier and the subpolar glacier.
Industry:Weather
In a surface water body, a curve depicting the volume of stored water as a function of stage.
Industry:Weather
Generally, a number describing some characteristic of a population or samples therefrom. Specifically, an estimate of a statistical parameter computed from a sample.
Industry:Weather
Generally, any wave that exhibits stable motion and is not an unstable wave.
Industry:Weather
