A type of air mass with characteristics developed mostly in winter over arctic surfaces of ice and snow. Arctic air is cold aloft and extends to great heights, but the surface temperatures are often higher than those of polar air. For two or three months in summer arctic air masses are shallow and rapidly lose their characteristics as they move southward. See also antarctic air, airmass classification.
A type of air mass that develops during the winter over surfaces of ice and snow. The air mass is deep but surface temperatures are usually higher than those of a polar air mass.
a mass of very cold, dry air that usually originates over the Arctic Ocean north of Canada and Alaska.