Air Mass and Pressure
Does the air mass of the cold, dry weather and wet, warm
weather have anything to do with the difference in pressure?
Cold, dry air is more dense than warm, moist air. If hot air masses are the
same height, the cold air will have higher pressure at the earth's surface.
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
The difference in winter and summer air masses have
more to do with their origins. Cold, dry winter air masses
originate in the dry regions of Northern Canada or the Arctic,
whereas warm, wet summer air masses originate from the south
or the Gulf of Mexico, where more moisture is available to
be evaporated into the air mass.
David R. Cook
Atmospheric Research Section
Environmental Research Division
Argonne National Laboratory
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Update: June 2012