- 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, ...
Colloquially an ice crystal, or more commonly an aggregation of many crystals that falls from a cloud. Simple snowflakes (single crystals) exhibit beautiful variety of form, but the symmetrical shapes reproduced so often in photomicrographs are not found frequently in snowfalls. Broken single crystals, fragments, or clusters of such elements are much more typical of actual snow. Snowflakes made up of clusters of crystals (many thousand or more) or crystal fragments may grow as large as three to four inches in diameter, often building themselves into hollow cones falling point downward. In extremely still air, flakes with diameters as large as 10 inches have been reported.
Industry:Weather
Collective term for a series of totally fluorinated hydrocarbons (e.g., CF<sub><sub>4</sub></sub>, C<sub><sub>2</sub></sub>F<sub>6</sub>), which are present in the atmosphere as a result of anthropogenic activities. These species are very resistive to destruction in the atmosphere and thus have extremely long lifetimes (thousands of years). As a consequence of their extremely long lifetimes and strong infrared absorption features, the large greenhouse warming potentials of these compounds is of some concern.
Industry:Weather
Circulation of flow about a horizontal or nearly horizontal axis that is usually associated with flow over the lee side of a barrier, such as a mountain range. See rotor cloud.
Industry:Weather
Chemical derivatives of sulfuric acid; can be regarded as being formed by neutralizing sulfuric acid by an appropriate base, for example, reaction with NaOH forms sodium sulfate. Sulfates are a large component of seawater and, hence, sea-salt aerosol.
Industry:Weather
Chart showing elapsed time between plant or crop development stages through its life cycle. The unit of time may be in calendar units such as days or in other measures such as thermal time (growing degree-days), fraction of life cycle, etc. See phenology.
Industry:Weather
Chart displaying the observed or forecast significant weather phenomena at different flight levels that may affect the operation of the aircraft.
Industry:Weather
Characteristics of the seasonal distribution of precipitation at a particular place.
Industry:Weather
Calculation of the pressure at a standard level from the pressure measured at another level by taking into account, according to theory, the weight of a column of air between the two levels.
Industry:Weather
Calculation by which temperature observed at a particular altitude is reduced to value for mean sea level, assuming a mean lapse rate of the atmosphere.
Industry:Weather
