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Air Masses

Air Masses. A body of air that has the same temperature and humidity throughout. What is an air mass?. If a large body of air sits over an area of land or water for a long period of time, it will take on the characteristics of the land or water beneath it. Temperature Humidity.

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Air Masses

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  1. Air Masses

  2. A body of air that has the same temperature and humidity throughout. What is an air mass?

  3. If a large body of air sits over an area of land or water for a long period of time, it will take on the characteristics of the land or water beneath it. • Temperature • Humidity How do air masses form?

  4. The relative measure of the amount of water vapor in the air • Psychrometer-measures humidity • Water vapor affects the density of the air. • Cold air is heavier than warm air. Humidity

  5. Air masses over the equator will have high temperatures. • Air masses over polar regions will have low temperatures. • Air masses over water (maritime) will have high humidity (moisture content). • Air masses over land (continental) will have low humidity (moisture content). Location, Location, Location…

  6. Air masses tend to form in areas with little wind. • Remember, they sit over an area for a long period of time without moving. Where do air masses form?

  7. Air masses that form over water are called maritime. • Air masses that form over land are called continental. Labeling Air Masses

  8. mT – maritime tropical • cT – continental tropical • mP – maritime polar • cP – continental polar • cA – continental arctic Classification of Air Masses

  9. Location of Air Masses

  10. mT – warm, moist air • cT – warm, dry air • mP – cold, moist air • cP – cold, dry air • cA – super cold, dry air Characteristics of Air Masses

  11. Convection! How do air masses move?

  12. Warm air rises, and cold air moves in to replace it. • A circulation pattern is formed. • Causes air and water currents to form Convection

  13. Density! • Warm air rises. • Cool air sinks. • Density is the property that helps create convection currents How does convection work?

  14. How do different air masses form? Reflection Question

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