- 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, ...
Noise with energy monotonically decreasing as the frequency increases; unlike white noise where the same energy is found at all frequencies.
Industry:Weather
Numerous cloud shreds below the main cloud. These shreds may constitute a layer, which may be separated from the main part of the cloud, or attached to it. This accessory cloud occurs mostly with nimbostratus, cumulus, and cumulonimbus. See scud, cloud classification.
Industry:Weather
Name given to the isotope <sup>14</sup>C, which has a half-life of about 5500 years and is formed in the upper atmosphere by the reaction of neutrons on nitrogen. It has also been formed locally by nuclear detonations in the upper atmosphere. Thus, it is useful as a radioactive tracer for distinguishing stratospheric transport and for dating organic matter. As a result of the gradual decay of this isotope, carbon-containing compounds that have been deposited at the earth's surface have a different isotopic signature than the carbon in the atmosphere.
Industry:Weather
Mountain waves with very large amplitudes produced when the natural wavelength of the air matches the width of the hill. The Froude number is near 1 in this type of flow.
Industry:Weather
Movement of ocean water into a coastal aquifer, often caused by pumping of the aquifer. See'' also'' saltwater intrusion.
Industry:Weather
Movement of saline water into an aquifer. See'' also'' seawater intrusion.
Industry:Weather
Modulation in which the phase of a signal is caused to depart from its reference value by an amount proportional to the instantaneous value of the modulating function. A signal phase modulated by a given function can be regarded as the same as a signal frequency modulated by the time derivative of that function.
Industry:Weather
Most indicators of solar activity vary in a quasiperiodic manner, with successive maxima separated by an average interval of about 11 years.
Industry:Weather
