- المجال: 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 high that may be completely encircled by an isobar or contour line. See closed low.
Industry:Weather
A graphic representation (a hodograph) of a rotary current (of a tidal current, or a harmonic component of a tidal current, during a complete tidal cycle) in which the velocity of the current at different hours of the tidal cycle is represented by radius vectors and vector angles. A line joining the extremities of the radius vectors will form a curve roughly approximating an ellipse.
Industry:Weather
A graphic representation of the flow of a current. In the reversing type of tidal current, the curve is referred to rectangular coordinates with time represented by the abscissa and the speed of the current by the ordinate, the flood speeds being considered as positive and the ebb speeds as negative. In general, the current curve for a reversing tidal current approximates a cosine curve.
Industry:Weather
Without qualification, usually means the primary cosmic rays of extra-terrestrial origin that continually bombard the earth and consist mostly of high-energy protons, about 9% helium and heavier nuclei, a small percentage of electrons, and some gamma rays. The energies of cosmic rays are well in excess of billions of electron volts. Secondary cosmic rays result from interactions between primary rays and atoms in the earth's atmosphere. Most cosmic rays probably originate from the Milky Way galaxy, but a small fraction come from the sun as evidenced by diurnal variations in the cosmic ray flux.
Industry:Weather
A general term for instruments that collect cloud droplets to determine their size or impurities; includes devices with direct-impaction surfaces that either capture or leave an impression of the impinging droplets, such as the cloud gun, as well as bulk samplers that capture and collect cloud droplets for chemical analysis, such as the rime rod.
Industry:Weather
A graph containing the parameters pressure, temperature, and relative humidity for critical values at which condensation trails form. The graph is used as an aid in forecasting the formation of condensation trails.
Industry:Weather
A French term for a standing wave phenomenon associated with the reflection of an ocean wave train from a vertical surface, such as a breakwater or pier. A standing wave is a periodic vertical motion of the sea surface that does not propagate horizontally. It can be thought of as being created by the superposition of two identical waves propagating in opposite directions.
Industry:Weather
A function of thermodynamic variables that is the coefficient of proportionality between the gradients of the density and pressure fields in a barotropic atmosphere. See also barotropy.
Industry:Weather
A form of ice crystal consisting of a hexagonal column with plate crystals or stellar crystals at its ends and sometimes at intermediate positions. The caps are perpendicular to the column and form as the crystal enters regions where change of air temperature leads to change in crystal structure from column to plate.
Industry:Weather
