- 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, ...
Weather forecasting based on meteorological observations made at a single station. See single-station analysis.
Industry:Weather
Weight of streamlined shape attached to a sounding line or to the suspension of a current meter when observing depth and/or velocities in streams.
Industry:Weather
Without qualification usually means the speed of propagation of electromagnetic radiation of any frequency in free space, a universal constant with the value 2. 99792 × 10<sup>8</sup> m s<sup>−1</sup>. Could also mean the phase velocity or group velocity of an electromagnetic wave in a material medium.
Industry:Weather
The use of special forms of frequency, phase, or amplitude modulation to permit a radar system to achieve higher range resolution than that normally permitted by a given pulse duration. A suitably modulated transmitter pulse of duration τ (and hence range resolution ''c''τ/2, where ''c'' is the velocity of light) may be processed after reception to obtain a higher range resolution ''c''τ/2''n'', where ''n'' is the pulse-compression ratio. Compression ratios of 10–100 are commonly achieved through the use of linear FM, nonlinear FM, or phase-coded modulation, implemented by analog or digital means. The advantage of pulse compression over simply transmitting shorter pulses is that high range resolution is achieved while maintaining the benefits of high pulse energy.
Industry:Weather
The use of modulation within a radar or sodar pulse to increase the range resolution beyond that normally achievable with a pulse of the same length. In a common technique, the phase of the transmitter carrier is inverted several times in an optimized sequence during the transmitted pulse. This modulation is undone by a complementary process in the receiver to produce an effective pulse length narrower by a factor equal to the number of inversions in the transmitted pulse sequence. See pulse compression.
Industry:Weather
The unit of kinematic viscosity in the centimeter-gram-second system, one cm<sup>2</sup>s<sup>−1</sup>, named in honor of Sir George Gabriel Stokes (1819–1903).
Industry:Weather
The use of meteorological radar measurements for hydrological purposes, particularly for estimating the current precipitation intensity as a function of location over a region and the total precipitation during a prescribed time interval, and for deriving estimates of runoff and streamflow.
Industry:Weather
The use of artificial earth-orbiting satellites for the purposes of imaging the atmospheric, land, and oceanic systems; providing atmospheric profiling; and collecting and relaying environmental data. Satellite meteorology involves the sampling of weather and climate features in time and space, as well as the development of new algorithms and interpretation methods, satellite sensors, and products for weather and weather applications.
Industry:Weather
