- 行业: Weather
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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, ...
A system of physical units in which the fundamental quantities are length, time, mass, electric current, temperature, luminous intensity, and amount of substance, and the corresponding units are the meter, second, kilogram, ampere, kelvin, candela, and mole. It has been given official status and recommended for universal use by the General Conference on Weights and Measures. It is also known (in French) as Système International d'Unités.
Industry:Weather
The signal at an intermediate stage of radar and lidar receivers, chosen at a standard frequency (often 30 or 60 MHz) where amplifiers and filters are commonly available. The radar or lidar echoes are converted to IF signals by a mixer, which shifts the frequency of the signals through the use of a local oscillator. Information is extracted from IF signals by detection or coherent detection.
Industry:Weather
In Doppler radar and lidar receivers, the quadrature video channels produced by coherent detection of the IF signal. The energy in the two channels is in phase quadrature, and they may be considered together to be a single complex signal with frequency components from −F to +F, where F is the passband limit of the low-pass filter used in the demodulator.
Industry:Weather
A type of dead-reckoning navigational system, used on aircraft and other vehicles, which is based on the measurement of accelerations. Accelerations are measured by devices such as gyroscopes, stabilized with respect to inertial space. Navigational information such as vehicle velocity, orientation, and position is determined from these measurements by computers or other instrumentation.
Industry:Weather
A radiation scale for measurement of solar exitance (irradiance). Defined in 1956, it replaced the Ångström and Smithsonian scales, and was itself replaced in 1975 by the Absolute Radiation Scale.
Industry:Weather
A Michelson interferometer that flew on Nimbus 3 and 4, launched in April 1969 and April 1970, respectively. IRIS measured a broad spectrum from 5 to 20 μm, with a resolution of 150 km.
Industry:Weather
A World Meteorological Organization project, which began in July 1983, to collect visible and 11-μm infrared satellite data from polar and geostationary platforms and process them into cloud climatology. Satellite data are sampled at intervals of 30 km and 3 h.
Industry:Weather
Same as calorie; sometimes called the international calorie or international steam table calorie.
Industry:Weather
The name given to ITOS-1 and NOAA- 1 to -5. ITOS satellites were launched between 1970 and 1976. See TIROS.
Industry:Weather
