- 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 series of field tests expected to yield unbiased statistical data of the efficiency of a given agent used in cloud seeding. Attempts are made to simulate chance distributions in order to reduce the effects of uncontrolled natural variability in meteorological and other external conditions. Also required are the delineations of a defined target area and an undisturbed, but otherwise similar, control area.
Industry:Weather
A series composed of all events during the period of record that exceed some set criterion, for example, all floods above a selected base, or all daily rainfalls greater than a specified amount. Such series are used in frequency analysis to determine return periods, etc.
Industry:Weather
A sequence of interactions that amplifies the response to an initial perturbation. The snow and ice albedo–temperature feedback is an example of a positive feedback. Compare negative feedback.
Industry:Weather
A sensor with a narrow field of view that must scan to enlarge the portion of the atmosphere or earth being measured.
Industry:Weather
A sensor designed to detect the rapid rise in pressure associated with the leading edges of outflow boundaries (pressure jump) or beneath strong downdrafts (pressure nose).
Industry:Weather
A semipermanent mass of firn formed by drifted snow in depressions in the ground or behind obstructions.
Industry:Weather
A secondary front that forms behind a frontal cyclone and within a cold air mass characterized by an appreciable horizontal temperature gradient. These are not uncommon phenomena; however, they often appear more as weak troughs or instability lines embedded in the cold-air flow. It may be difficult to determine when or if these become true fronts.
Industry:Weather
A sealed balloon made from a material of high modulus of elasticity. The balloon has an excess of lifting gas, producing an overpressure at the altitude of neutral buoyancy. As the balloon gas heats and cools, the excess pressure stresses the balloon film. If the balloon material has a high enough modulus, strain is minimal. With system mass constant and balloon volume almost constant, the balloon floats at a near-constant density level night and day in the absence of convection or wetting.
Industry:Weather
A selectable interval of range (or of time delay from transmission) within which returning radar signals are measured. Gating is used to isolate the echoes from different regions of distributed targets. Contiguous range gates of narrow width, separated by a distance equal to half the transmitted pulse length, are often used in lidar and weather radar systems. Some systems employ as many as a thousand range gates to measure the signals returned along each pointing direction. See gating.
Industry:Weather
A seasonal current along the south coast of Java. The current flows southeastward during December–April and northwestward during June– October, when it is associated with coastal upwelling.
Industry:Weather
