By evaporation of water from the land or sea surface or by transpiration from plants.
The air mass of maritime is a type of air mass that has both uniform moisture and temperature. It usually begins over something like an ocean or similar body of water and is known for its moisture.
The temperature and moisture characteristics are uniform in the same air mass.
Air mass is a huge body of air with similar temperature, humidity, and air pressure.
Moisture and Temperature
When an air mass forms near the poles it has warm air. This will be a large body of air which will have homogeneous moisture.
temperature and moisture
By The source region
Cold air has little moisture, warm air has lots. When cold air runs into warm air then the warm air is pushed up until the moisture in the air gets cold enough to form rain
temperature humidity and pressure
temperature, pressure, and moisture
temperature, pressure, and moisture
Yes. You can have a cooler air mass on top of a warm air mass. However, this arrangement is unstable and will naturally tend to revert itself. If the warm air mass has enough moisture, thunderstorms are likely.