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Section S S index 1151-1159 of 1376 terms
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subpoint—The point on the earth centered directly below a satellite. This is also called the point of zero nadir angle for a satellite in earth orbit.
subpolar anticyclone—Same as subpolar high.
subpolar glacier—In Ahlmann's glacier classification, a polar glacier with 10–20 m of firn in the accumulation area where some melting occurs.
subpolar high—(Also called subpolar anticyclone, polar high, polar anticyclone.) A high that forms over the cold continental surfaces of subpolar latitudes, principally in Northern Hemisphere winter. These highs typically migrate eastward and equatorward.
subpolar low pressure belt—A band of low pressure located, in the mean, between 50° and 70° latitude. In the Northern Hemisphere, this belt consists of the Aleutian low and the Icelandic low. In the Southern Hemisphere, it is supposed to exist around the periphery of the Antarctic continent.
subpolar westerlies—See westerlies.
subrefraction—See substandard propagation.
subregional broadcast—A radio broadcast covering an area smaller than that of a regional broadcast.
subsidence inversion—An increase in temperature with height produced by the adiabatic warming of a layer of subsiding air. This inversion is enhanced by vertical mixing in the air layer below the inversion.
subsidence—A descending motion of air in the atmosphere, usually with the implication that the condition extends over a rather broad area.
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