- 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 mirage in which the angular height of the image is less than that of the object. As the width is unaffected (the angular width of image width remains that of the object because the refractive index gradient is vertical), the aspect ratio is altered and distant images appear vertically squashed. Stooping often accompanies looming: Distant features appear lifted and squashed. Compare towering, sinking.
Industry:Weather
A method to approximate the amount of turbulence by assuming that it is proportional to the amount of static or dynamic instability in the air, since turbulence responds to instabilities and reduces or removes them by causing turbulent mixing. An example of such a parameterization would be to relate the eddy viscosity to the Richardson number, or the transilient matrix to the mixing potential.
Industry:Weather
A method of winds-aloft observation; that is, the determination of wind speeds and directions in the atmosphere above a station. It is accomplished by tracking a balloon-borne radar target, responder, or radiosonde transmitter with either radar or a radio direction finder. With a radio direction finder, the height data must be supplied by other means, normally by concurrent radiosonde observation. With radar, if height data are not otherwise supplied, the slant range must be recorded in addition to the angles of elevation and azimuth.
Industry:Weather
A method of winds-aloft observation; that is, the determination of wind speeds and directions in the atmosphere above a station. It is accomplished by recording the elevation and azimuth angles of the balloon at specified time intervals while visually tracking a radiosonde balloon with a theodolite. A rabal is basically the same as a pilot-balloon observation, except that the height data are derived from the radiosonde observation rather than from an assumed balloon ascension rate.
Industry:Weather
A method of merging the shape or mathematical representation of a meteorological variable versus height in one layer with a different shape or representation in an adjacent layer. An example in the atmospheric boundary layer would be the matching of an exponential wind profile at the top of a forest canopy with a logarithmic wind profile just above it in the surface layer.
Industry:Weather
A method of deriving a unit hydrograph for a desired duration from one of another duration through the use of an S-curve.
Industry:Weather
A method of analysis that determines whether two different perturbation (turbulent) variables are correlated by plotting their joint frequency of occurrence.
Industry:Weather
A method of categorizing the stability of a region of the atmosphere in terms of the horizontal surface wind, the amount of solar radiation, and the fractional cloud cover.
Industry:Weather
A method for determining the transmissivity and storativity of a confined or unconfined aquifer.
Industry:Weather
A mesoscale circulation feature in which a system-relative current of air enters and flows through the stratiform precipitation region of mesoscale convective systems from the rear. The rear-inflow jet forms in response to the upshear-tilting of the convective circulation, as the horizontal buoyancy gradients along the back edge of the system create a circulation that draws midlevel air in from the rear. The rear-inflow jet supplies potentially cold and dry midlevel air that aids in the production of convective and system-scale downdrafts.
Industry:Weather
