- 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 ratio of the mass of ice per unit mass of dry air in a sample containing cloud ice and/or frozen precipitation.
Industry:Weather
An aircraft flight conducted by use of navigational instruments that permit the flight crew to proceed without reference to visual landmarks or celestial fixes.
Industry:Weather
In aviation terminology, route or terminal weather conditions of sufficiently low visibility to require the operation of aircraft under instrument flight rules.
Industry:Weather
The ratio of the mass of ice per unit mass of dry air in a sample containing cloud ice and/or frozen precipitation.
Industry:Weather
A type of fog, composed of suspended particles of ice, partly ice crystals 20 to 100 μm in diameter, but chiefly, especially when dense, droxtals 12–20 μm in diameter. It occurs at very low temperatures, and usually in clear, calm weather in high latitudes. The sun is usually visible and may cause halo phenomena. Ice fog is rare at temperatures warmer than −30°C, and increases in frequency with decreasing temperature until it is almost always present at air temperatures of −45°C in the vicinity of a source of water vapor. Such sources are the open water of fast-flowing streams or of the sea, herds of animals, volcanoes, and especially products of combustion for heating or propulsion. At temperatures warmer than −30°C, these sources can cause steam fog of liquid water droplets, which may turn into ice fog when cooled (see frost smoke). See ice-crystal haze, arctic mist.
Industry:Weather
A thin but hard layer of sea ice, river ice, or lake ice. Apparently this term is used in at least two ways: 1) for a new encrustation upon old ice; and 2) for a single layer of ice usually found in bays and fjords where freshwater freezes on top of slightly colder seawater. See ice crust.
Industry:Weather
A type of radio antenna often used because of its directional properties and simple structure. It consists essentially of flared extensions of a metallic waveguide. Large horn antennas are used primarily in research applications to produce very narrow vertical or horizontal beams.
Industry:Weather
The cycle in which water evaporates from the oceans and the land surface, is carried over the earth in atmospheric circulation as water vapor, precipitates again as rain or snow, is intercepted by trees and vegetation, provides runoff on the land surface, infiltrates into soils, recharges groundwater, discharges into streams, and ultimately, flows out into the oceans, from which it will eventually evaporate again.
Industry:Weather
The cycle in which water evaporates from the oceans and the land surface, is carried over the earth in atmospheric circulation as water vapor, precipitates again as rain or snow, is intercepted by trees and vegetation, provides runoff on the land surface, infiltrates into soils, recharges groundwater, discharges into streams, and ultimately, flows out into the oceans, from which it will eventually evaporate again.
Industry:Weather
