- 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, ...
The portion of the boundary layer extending from the surface to the average altitude of the base of clouds with updrafts originating in the boundary layer. It encompasses the mixed layer and the surface layer.
Industry:Weather
The period from about 3. 2 to 2. 5 million years ago during which polar temperature was 5°–10°C warmer than today, the Antarctic and Arctic ice caps nearly melted, and sea level was 35 m higher.
Industry:Weather
The period of time in which continuous precipitation is observed, or occurs at a specific point or within a specific area.
Industry:Weather
The periodic expansion of continental ice sheets to cover much of Canada and northeastern Asia during the interval 2 500 000–10 000 years ago.
Industry:Weather
The permanent outflow of ionization from the polar regions of the magnetosphere.
Industry:Weather
The phase function applicable to Rayleigh scattering of unpolarized radiation. The Rayleigh phase function is expressed as ''p''(θ) = (3/4)(1 + cos<sup>2</sup>θ), where θ is the scattering angle.
Industry:Weather
The part of the hydrologic cycle undergone by water between the time it reaches the land as precipitation and its subsequent evapotranspiration or discharge through stream channels.
Industry:Weather
The point on the earth's orbit that is nearest the sun. At present, the earth reaches this point on about 1 January, but the date varies irregularly from year to year (due to leap years) and also has a slow secular change. For a more complete discussion, See aphelion; See'' also'' pericenter, perigee.
Industry:Weather
The point on the earth where a satellite sensor is focused at any time during its orbit. If the sensor vertical axis is perpendicular to the earth's surface, the principal point coincides with the subpoint. 2. A term used in remote sensing; the point where the optical axis intersects the principal plane.
Industry:Weather
The point on the earth centered directly below a satellite. This is also called the point of zero nadir angle for a satellite in earth orbit.
Industry:Weather
