airmass source region ( synonym found)
Definition of airmass source region:

(n) : Meteorology. An extensive area of the earth's surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a distinct air mass. See Airmass
Definition of airmass source region:

(n) : Meteorology. An extensive area of the earth's surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a distinct air mass. See Airmass
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