| Section S | S index | 151-159 of 1376 terms |
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sea level pressure—The atmospheric pressure at mean sea level, either directly measured or, most commonly, empirically determined from the observed station pressure. In regions where the earth's surface is above sea level, it is standard observational practice to reduce the observed surface pressure to the value that would exist at a point at sea level directly below if air of a temperature corresponding to that actually present at the surface were present all the way down to sea level. In actual practice, the mean temperature for the preceding 12 hours is employed, rather than the current temperature. This “reduction of pressure to sea level” is responsible for many anomalies in the pressure field in mountainous areas on the surface synoptic chart.
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sea level—The level of the sea after averaging out the short-term variations due to wind waves. It is used loosely as a synonym for mean sea level.
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sea-salt nucleus—A condensation nucleus of a very hygroscopic nature produced by partial or complete desiccation of particles of sea spray or of seawater droplets derived from breaking bubbles. That such nuclei are important in condensation processes over the oceans and near coasts is fairly well established, but it appears that they are not in general the source of nuclei in condensation over continental interiors.
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sea smoke—(Also antarctic sea smoke, arctic sea smoke, arctic smoke.) Same as steam fog, but often specifically applied to steam fog rising from small areas of open water within sea ice in the Arctic or Antarctic region.
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sea surface temperature—The temperature of the ocean surface. The term sea surface temperature is generally meant to be representative of the upper few meters of the ocean as opposed to the skin temperature, which is the temperature of the upper few centimeters.
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