1) Meteorology 2) Study of the atmosphere 
study of the atmosphere
• (n.) That department of physics which treats of the atmosphere.
<study> That department of physics which treats of the atmosphere. ... Origin: F. Aerologie. ... (04 Mar 1998) ... 
A`ër·ol'o·gy noun [ Aëro- + -logy : confer French aérologie .] That department of physics which treats of the atmosphere. 
Aerology is the science concerned with the study of atmospheric conditions away from ground level.
[n] - meteorology of the total extent of the atmosphere
aerology 1. The scientific study of atmospheric conditions at heights which are unaffected by the friction of the earth's surface. 2. The branch of meteorology that studies the total vertical extent of the earth's atmosphere as opposed to the atmosphere which is close to the earth's surface. The most commonly studied atmospheric factors in aerolo...
noun meteorology of the total extent of the atmosphere; especially the upper layers
the branch of meteorology involving the observation of the atmosphere by means of balloons, airplanes, etc. · (in former use by the U.S. Navy) meteorology.