- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
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 conical mound on a land surface, caused by the freezing of water in the ground. It is a product of frost heaving, but is unusual in that it requires a great concentration of water in a relatively small subsurface volume. Usually a frost mound is of seasonal duration. Compare pingo, earth hummock, ground ice; see frost blister.
Industry:Weather
A thin skin of frazil crystals coagulated on the sea surface having a dark, greasy appearance. It precedes the development of shuga.
Industry:Weather
The upper rim of the low sun usually displays a green rim. The transient sighting of this rim, between its obscuration by the rest of the sun and its obstruction by the horizon, is sometimes credited with being the origin of the green flash. But, while the color of the flash is provided by the green rim, the size and transient nature has more to do with multiple-image mirages.
Industry:Weather
The upper rim of the low sun usually displays a green rim. The transient sighting of this rim, between its obscuration by the rest of the sun and its obstruction by the horizon, is sometimes credited with being the origin of the green flash. But, while the color of the flash is provided by the green rim, the size and transient nature has more to do with multiple-image mirages.
Industry:Weather
The lowest level at which the wind becomes geostrophic in the theory of the Ekman spiral, proportional to (ν/sinφ)½, where ν is the kinetic eddy viscosity and φ the latitude. In practice it is observed that the geostrophic wind level is often between 1 and 2 km, and it is assumed that this marks the upper limit of frictional influence of the earth's surface. The geostrophic wind level may be considered to be the top of the Ekman layer and planetary boundary layer, that is, the base of the free atmosphere.
Industry:Weather
The lowest level at which the wind becomes geostrophic in the theory of the Ekman spiral, proportional to (ν/sinφ)½, where ν is the kinetic eddy viscosity and φ the latitude. In practice it is observed that the geostrophic wind level is often between 1 and 2 km, and it is assumed that this marks the upper limit of frictional influence of the earth's surface. The geostrophic wind level may be considered to be the top of the Ekman layer and planetary boundary layer, that is, the base of the free atmosphere.
Industry:Weather
In England, a storm or gale occurring at about the end of April or the beginning of May.
Industry:Weather
