- 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, ...
In hydrology, a statistically derived hydrograph for a storm of specified duration, graphically representing the percent of total direct runoff passing a point on a stream, as a function of time. This is usually presented as a histogram or table of percent runoff within each of successive short time intervals. In principle it is the same as the unit hydrograph; both are used as tools in river forecasting and for other purposes such as the comparison of runoff characteristics of different drainage areas.
Industry:Weather
A clearly delineated limpid lane forming behind an aircraft flying in a thin cloud layer; the opposite of a condensation trail. The heat of combustion of the aircraft fuel, released into the swept path by the exhaust stacks of the aircraft, can, under certain conditions, evaporate existing clouds (if not too dense) and yield a distrail. Clouds of low liquid water content and relatively high temperature are susceptible to distrail formation but the phenomenon is comparatively rare.
Industry:Weather
The quantity of a solute sorbed by a solid, per unit weight of solid, divided by the quantity of the solute dissolved in the water per unit volume of water.
Industry:Weather
A radar target that is large compared with the pulse volume, which is the cross-sectional area of the radar beam multiplied by one- half the length of the radar pulse. Clouds and precipitation are examples.
Industry:Weather
Arrangement in time or space, or appointment among various classes or class intervals, especially ranges of values of a certain variable. See probability distribution, frequency distribution.
Industry:Weather
Nonrealistic reproduction, or nonideal formation. In optics, it is an imperfection in an image caused by an imperfection in the optical system by which the image is produced. In electronics, distortion is a change in waveform of a signal that occurs upon passage of the signal through an instrument. Crystal distortion is the expansion of a crystal lattice near any crystal boundary surface.
Industry:Weather
The process in which a molecule is broken into two fragments by rupture of a chemical bond. The dissociation may occur via a thermal process, or following the absorption of a photon (photodissociation).
Industry:Weather
A clearly delineated limpid lane forming behind an aircraft flying in a thin cloud layer; the opposite of a condensation trail. The heat of combustion of the aircraft fuel, released into the swept path by the exhaust stacks of the aircraft, can, under certain conditions, evaporate existing clouds (if not too dense) and yield a distrail. Clouds of low liquid water content and relatively high temperature are susceptible to distrail formation but the phenomenon is comparatively rare.
Industry:Weather
A closed thermal circulation in a vertical plane in which the rising motion occurs at higher potential temperature than the sinking motion. Such a cell converts heat energy to potential energy and then to kinetic energy. The importance of such cells in the atmosphere, in particular the subtropical and equatorial circulation, is much discussed in theories of the general circulation. It has also been suggested that the tropical cyclone is essentially a direct cell. See indirect cell.
Industry:Weather
1. In radar, a presentation of the reflectivity, mean Doppler velocity, or other properties of the received signals in a form to facilitate analysis or interpretation. Common displays are the PPI, RHI, and THI. 2. Same as indicator.
Industry:Weather
