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Section S S index 1001-1009 of 1376 terms
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Stevenson screen—A type of instrument shelter. The shelter is a wooden box painted white with double louvered sides and mounted on a stand 122 cm (4 ft) above the ground. In addition to the dry- and wet-bulb thermometers, it usually contains maximum and minimum thermometers.
sticking coefficient—See mass accommodation coefficient.
stiff system—A system of differential equations with solutions that contain a rapidly damping component (as would describe the displacement of a stiff spring when stretched and then released). Such systems are used to describe rapid photochemical reactions that take place in the upper atmosphere. Special numerical techniques are often required to solve stiff systems in order to maintain stability of the computation.
Stikine wind—The severe, gusty east-northeast wind in the vicinity of the Stikine River near Wrangell, Alaska. It is produced under the same conditions as a Taku wind.
stilb—A unit of luminance (or brightness) equal to one international candle per cm2.
still-water level—The level that the sea surface would assume in the absence of wind waves; not to be confused with mean sea level or half-tide level.
still well—A device, used in evaporation pan measurements, that provides an undisturbed water surface and support for the hook gauge. The National Weather Service model consists of a brass cylinder, 8 in. high and 3.5 in. in diameter, mounted over a hole in a triangular galvanized iron base that is provided with leveling screws.
stilling-well gauges—An instrument system for measuring sea levels; tidal changes of levels are detected by the movement of a float in a well, which is connected to the open sea by a restricted hole or narrow pipe. Wind waves are eliminated by the constriction of the connection.
stirring—See mixing.
stochastic hydrology—The science that pertains to the probabilistic description and modeling of the value of hydrologic phenomena, particularly the dynamic behavior and the statistical analysis of records of such phenomena.
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