Upper-air
noun, Meteorology.
1.
the atmosphere above the lower portion of the troposphere.
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noun, Meteorology. 1. the portion of the atmosphere above the troposphere. upper atmosphere noun 1. (meteorol) that part of the atmosphere above the troposphere upper atmosphere The part of the atmosphere above the troposphere. The upper atmosphere includes the mesosphere, the ionosphere, the thermosphere, and the exosphere. Temperatures in the upper atmosphere decrease with increasing […]
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