An air mass that originates over the ocean. These air masses are humid.
An air mass that forms over an ocean, making it humid. It may be warm or cold.
An air mass that forms over water. It is usually humid, and may be cold or warm.
Moist air mass originating over the ocean.
An air mass influenced by the sea. It is a secondary characteristic of an air mass classification, signified by the small "m" before the primary characteristic, which is based on source region. For example, mP is an air mass that is maritime polar in nature. Also known as a marine air mass.