- 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, ...
A cold, northeasterly, often strong fall wind descending the southerly slopes of Mount Athos, on the Hagion Oros Peninsula in northeastern Greece, and extending several kilometers out over the northern Aegean Sea.
Industry:Weather
A supplementary meteorological observation between regular synoptic observation periods.
Industry:Weather
Communication where the sender is able to send data at any time, and with any time gaps the sender desires.
Industry:Weather
A series of the form c0 + (c1/x) + (c2/x2) +. . . + (cn/xn) +. . . Often used for formal solution of differential equations or for function approximation when is large. Though such series are divergent, terms initially decrease in size to one of minimum value at which term the series can be truncated to obtain a useful approximation.
Industry:Weather
The mean cosine of the scattering angle, found by integration over the complete scattering phase function. The asymmetry factor is a fundamental property of a scattering medium that affects the transfer of radiant energy through the medium. Particles that are small compared to the wavelength of the radiation, such as air molecules, have asymmetry factors close to zero. Larger particles, such as cloud droplets, typically have asymmetry factors ∼0. 85 for visible radiation, consistent with strong forward scattering.
Industry:Weather
The twilight stage during which the sun's unrefracted center is at elevation angles −12° > h0 > −18°. During a clear evening's astronomical twilight, horizontal illuminance due to scattered sunlight decreases from ∼0. 008 lux to ∼6 × 10−4 lux. At h0 = −18°, 1) no horizon glow is visible at the sun's azimuth (the bright segment's upper boundary is at the observer's astronomical horizon), 2) sixth-magnitude stars can be seen near the zenith, and 3) scattered sunlight's residual illuminance is less than that from starlight and airglow. Compare civil twilight.
Industry:Weather
1. The difference between the angular positions of the image and object of a celestial object that results from refraction in the earth's atmosphere. Astronomical refraction is greatest near the horizon where it normally exceeds a solar diameter. Consequently, we see the image of the sun above the horizon even though the sun itself is below, and this extends the length of the day measurably at both ends. 2. A variety of phenomena that result from the refraction of celestial light by the earth's atmosphere. It is distinguished from the term terrestrial refraction, which is used when the source is within our atmosphere.
Industry:Weather
Formation of a layer of relatively large particles at the surface of a deposit due to the removal of finer sediment particles by fluid erosion. The armoured layer generally resists further erosion.
Industry:Weather
The great circle that is 90° from the local vertical. The astronomical horizon is usually more convenient to use than the apparent horizon.
Industry:Weather
A northeasterly foehn extending over the Garonne Plain in France, resulting from flow over the Massif Central.
Industry:Weather
