You know what it looks like… but what is it called?
TAKE THE QUIZ“maritime air”
The following 2 entries include the term maritime air.
polar maritime air
noun: air coming originally from polar regions but having humidity and temperature properties modified by passing over relatively warm oceans
tropical maritime air
noun: air of a mass originating over tropical oceans and characterized by high temperature and humidity
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Merriam-Webster unabridged