airmass
（ plural ）
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(physics, meteorology) a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the Earth's surface (airmass source region) and (b) 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.
airmass
The advancing airmass carried the temperature and moisture characteristics it had acquired over its source region across a broad swath of the continent.
The advancing airmass carried the temperature and moisture characteristics it had acquired over its source region across a broad swath of the continent.
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