Atmospheric circulation is the large-scale movement of air, and the means (together with the smaller
ocean circulation) by which
heat is distributed on the surface of the
Earth. The large-scale structure of the atmospheric circulation varies from year to year, but the basic structure remains fairly constant. However, individual weather systems - midlatitude depressions, or tropical convective cells - occur "randomly", and it is accepted that weather cannot be predicted beyond a fairly short limit: perhaps a month in theory, or (currently) about ten days in practice (see
Chaos theory and
Butterfly effect). Nonetheless, the average of these systems - the climate - is quite stable.
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