An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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lower atmosphere
  هواسپهر ِ زیرین، جو ِ ~  
havâsepehr-e zirin, javv-e ~
Fr.: atmosphère inférieure  

Generally and quite loosely, that part of the atmosphere in which most weather phenomena occur (i.e., the → troposphere and lower → stratosphere); hence used in contrast to the common meaning for the → upper atmosphere. In other contexts, the term implies the lower troposphere (Meteorology Glossary, American Meteorological Society).

See also: → lower; → atmosphere.