| Definitions | | air mass |
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noun
- a widespread body of air, the properties of which can be identified as:
- having been established while that air was situated over a particular region of the earth's surface (airmass source region) and
- undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent.
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