- 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, ...
Any barrier designed to shelter an object or area from snow; analogous to windbreak. See snow fence, snow shed.
Industry:Weather
Analytical technique in which an atom or molecule absorbs and then emits radiation of a specific frequency, followed by detection of the emitted radiation. The radiation is usually provided by a plasma containing the atom or molecule to be detected, ensuring that radiation of the correct frequency is available (hence the term resonance). The technique has been adapted with great success to atmospheric measurements, for example, the measurement of ClO radicals in the antarctic ozone hole.
Industry:Weather
Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred.
Industry:Weather
Analog radar device used in the 1950s to measure the fluctuation rate of the detected target signal from which may be estimated the root-mean-square relative velocity among the scatterers in the pulse volume. This approach was made obsolete when pulsed Doppler radar was introduced to meteorology in the late 1950s.
Industry:Weather
An upper-air sounding that includes determination of wind speeds and directions. Historically, wind data were obtained by tracking a balloon-borne radiosonde with a radio direction finder. Contemporary methods include measuring position or radiosonde velocity from GPS or Loran radio navigation signals.
Industry:Weather
An upper-air observation that uses radar to obtain meteorological measurements of hydrometeors and winds aloft.
Industry:Weather
An update. ''Bull. Amer. Meteor. Soc. '', 72, 1521–1529.
Industry:Weather
An oscillation in the zonal winds of the equatorial stratosphere having a period that fluctuates between about 24 and 30 months. This oscillation is a manifestation of a downward propagation of winds with alternating sign. This phenomenon is sometimes referred to as the stratospheric quasi-biennial oscillation to distinguish it from other atmospheric features that also have spectral peaks near two years.
Industry:Weather
An orbit that precesses 360° during the course of the year, permitting the satellite to obtain views of a given geographical area at the same local time each day. A sun-synchronous satellite always crosses the equator on the ascending node at the same local solar time.
Industry:Weather
An optical phenomenon in which some species of dew-covered plants become strongly retroreflective. On a warm summer evening when a beam of light, such as car headlights, illuminates dew- covered trees, the scene is reminiscent of snow-covered trees in the moonlight. Four things must be present for the sylvanshine to be seen: the proper species of tree, the proper season of the year, dew-covered leaves, and a view looking directly down the beam of light illuminating the tree in an otherwise dark scene. The sylvanshine is closely related to the heiligenschein.
Industry:Weather
