- 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 chart used in making subjective estimates of the amount of solid matter emitted by smokestacks. The observer compares the grayness of the smoke with a series of shade diagrams formed by horizontal and vertical black lines on a white background.
Industry:Weather
A chemical reaction for which the rate of disappearance of reactants or the rate of appearance of the reaction product(s) is proportional to the product of the concentration of two reacting species, which may be the same. The constant of proportionality is the second-order rate coefficient for the chemical reaction and has the units of inverse concentration multiplied by inverse time.
Industry:Weather
A chart of an ocean area on which are plotted synoptic wave reports from vessels, along with computer-generated wave heights for areas where reports are lacking. Atmospheric fronts, highs, and lows are also shown. Isolines of wave height and the boundaries of areas having the same dominant wave direction are drawn.
Industry:Weather
A chart of a major ocean area that presents in graphic form averages obtained from weather, wave, ice, and other marine data gathered over many years in meteorology and oceanography to aid the navigator in selecting the quickest and safest routes; published in the United States by the Defense Mapping Agency Hydrographic/Topographic Center from data provided by the U. S. Naval Oceanographic Office and the National Environmental, Satellite Data and Information Service of the National Oceanic and Atmospheric Administration.
Industry:Weather
A chart or graph on which time is one coordinate and one (or more) of the observed meteorological elements at that station is the other coordinate. Compare continuity chart.
Industry:Weather
A characteristic atmospheric circulation that occurs in a region from time to time.
Industry:Weather
A characteristic basin in a natural region, where hydrologic observations are taken, so that the measurements would represent a broad area, rather than taking measurements on all basins in a given region.
Industry:Weather
A center of elevation or depression on a constant-pressure chart (or a center of high or low pressure on a constant-height chart) considered as a reappearing characteristic of successive charts. See corresponding point, principle of geometric association.
Industry:Weather
A category of aviation weather observation taken to report significant changes in one or more of the observed elements since the last record observation. The specific criteria demanding a special observation change from time to time. Basically they cover 1) significant changes in ceiling and visibility, particularly in the low ranges; 2) the appearance of low clouds; 3) the appearance and disappearance of a tornado or thunderstorm; 4) the beginning and ending of frozen or freezing precipitation; 5) pressure jumps; and 6) significant changes in the wind.
Industry:Weather
A change of direction and possibly amplitude of an electromagnetic, acoustic, or any other wave propagating in a material medium, homogeneous on the scale of the wavelength, as a consequence of spatial variation in the properties of the medium. This variation can be abrupt (on the scale of the wavelength), as in refraction of electromagnetic waves because of an air–water interface, or gradual, as in refraction of electromagnetic waves by the atmosphere. Refraction is distinguished from (specular) reflection in that the direction of propagation of the refracted wave does not have a component opposite the direction of the incident wave. See atmospheric refraction, refractive index; Compare diffraction, scattering.
Industry:Weather
