Cevap:
you can find in detail. An air mass is formed when two conditions meet: A homogeneous piece of land (land or ocean surface). Prolonged stay of the atmosphere part on this part of the earth. The regions where air masses form are called source regions. Large water and land surfaces where insolation is homogeneous, subsidence areas with low air masses, high pressure areas are suitable areas for the formation of air masses. While tropical regions and polar regions are suitable for formation of air masses, middle latitudes are not very suitable. The air in the middle latitudes is very active and the humidity and temperature are variable. The temperature and humidity are more stable in the polar and tropical regions.
If the air mass gains a new feature while passing through a different area during its movement, these areas are called secondary source regions. E.g; The cold and dry (terrestrial polar cP) air mass formed in winter over Siberia becomes a humid air mass by gaining moisture from the bottom while passing the Black Sea.
Air masses can form in 3 days to 1-2 weeks. These periods are different in warm and cold air masses. When hot air heats up, it gets lighter and rises, and it gets warmer at the top. As cold air masses cool, they become heavier and collapse, the upper parts of which cool later. Therefore, they occur later.
Air masses carry their properties from where they are for a long time to where they go. They carry heat, cold, drought or humidity on the earth.