noun
Antarctic air mass
Technical term in meteorology referring to a large body of air originating over Antarctica, characterized by very cold and dry properties.
南極気団が北上すると、南半球の気温が急激に下がることがある。
When an Antarctic air mass moves northward, temperatures in the Southern Hemisphere can drop sharply.
Compound of 南極 (Antarctic) + 気団 (air mass).