- 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, ...
The state of a tidal current when its speed is near zero, especially the moment when a reversing (rectilinear) current changes direction and its speed is zero. For a theoretical standing tidal wave, slack water occurs at the times of high water and low water, while for a theoretical progressive tidal wave, slack water occurs midway between high and low water.
Industry:Weather
The statistical or physical links between events that occur on the sun and a response observed on the earth, primarily in the atmosphere.
Industry:Weather
The steering of lower-level atmospheric disturbances along the contour lines of the tropopause, which lines are presumably roughly parallel to the direction of the wind at tropopause level.
Industry:Weather
The standard deviation (positive square-root of the variance) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable. See root-mean-square error, regression.
Industry:Weather
The steady motion of the rotational axis relative to coordinates fixed in the earth. The pole moves at a rate of about 10 cm per year in the general direction of Philadelphia, Pennsylvania. Polar wander is believed to be due to the redistribution of matter within the earth. It is sometimes called “apparent polar wander” because it is difficult to separate from continental drift.
Industry:Weather
The spread of sizes for raindrops falling at a given location; distributions change significantly with the process of formation (from melting snow or drop coalescence) and shear of horizontal and vertical wind, which locally sorts drops through their differential fall velocity. See raindrop, drop-size distribution.
Industry:Weather
The speed of propagation of a hydrodynamic influence. For the cyclonic-scale quasigeostrophic disturbances, the effective signal velocity is given approximately by the maximum group velocity and is usually of the order of 30° longitude per day.
Industry:Weather
The specific humidity of water vapor corresponding to the saturation mixing ratio.
Industry:Weather
The solution of a set of quasi-linear differential equations describing a fluid flow that possesses a family of straight-line characteristics. In such a fluid motion the dependent variables, or simple combinations thereof, are constant along the characteristics, and may be used as the basis of the integration of the equations by the method of characteristics. The simple waves of most interest to meteorology are the expansion wave and the compression wave. See simple harmonic wave.
Industry:Weather
