Movement of Air in Earth’s Atmosphere. What is wind? The movement of air from an area of higher pressure to an area of lower pressure. The movement of.

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Presentation transcript:

Movement of Air in Earth’s Atmosphere

What is wind? The movement of air from an area of higher pressure to an area of lower pressure. The movement of air from an area of higher pressure to an area of lower pressure.

How is wind produced? Areas of Earth receive different amount of radiation from the Sun because of the curved surface. Areas of Earth receive different amount of radiation from the Sun because of the curved surface. The area around the equator receives the most direct sunlight, so the air there is less dense. The area around the equator receives the most direct sunlight, so the air there is less dense. This air is displaced, or moved, by denser, colder air moving from the poles. Convection currents begin. This air is displaced, or moved, by denser, colder air moving from the poles. Convection currents begin.

What causes wind patterns? Flow of air caused by different amounts of heat received in different regions of the Earth, and Flow of air caused by different amounts of heat received in different regions of the Earth, and The Coriolis effect: the apparent change in the movement of air due to the rotation of the Earth. The Coriolis effect: the apparent change in the movement of air due to the rotation of the Earth.

Types of Global Winds Surface Winds Surface Winds Trade winds Trade winds Prevailing westerlies Prevailing westerlies Polar easterlies Polar easterlies Winds in the Upper Troposphere Winds in the Upper Troposphere Jet streams Jet streams

Global Wind Patterns

Types of Local Winds Sea Breezes Sea Breezes Created during the day because solar radiation warms the land more than the water. (specific heat!) Created during the day because solar radiation warms the land more than the water. (specific heat!) Convection takes place because of the difference in temperature and density of the air over land and water. Air is moved from water to land. Convection takes place because of the difference in temperature and density of the air over land and water. Air is moved from water to land.

Sea Breeze.

Types of Local Winds Land Breezes Land Breezes Occur at night when the land cools more rapidly than the surrounding ocean water. Occur at night when the land cools more rapidly than the surrounding ocean water. Convection takes place because of the difference in temperature and density of the air over land and water. Air is moved from land to water. Convection takes place because of the difference in temperature and density of the air over land and water. Air is moved from land to water.

Land Breeze