19.3: Global Wind Patterns http://www.toonpool.com/user/589/files/wind_farm_desert_island_128775.jpg.

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Presentation transcript:

19.3: Global Wind Patterns http://www.toonpool.com/user/589/files/wind_farm_desert_island_128775.jpg

Factors that Affect Winds Temperature difference between equatorial regions and the poles Rotation of the Earth www.physicalgeography.net wattsupwiththat.com

Factors that Affect Winds Locations of the Continents Time of year Local topography (mountains, valleys, plains, etc.) wallpaperstock.net science-class.net

Winds on a Non-rotating Earth Warm air near the equator would rise and move toward the poles aloft Cold air near the poles would move toward the equator at the surface

Winds on a Non-rotating Earth http://universe-review.ca/I09-15-circulation1.jpg

Effects of Earth’s Rotation Coriolis effect prevents air from flowing straight to equator from poles Also, air from the equator cools & sinks long before reaching the poles

Three-Celled Circulation Model 3-Celled Circulation Animation

Three-Celled Model Weaknesses Mid-latitude (between 30° & 60° latitude) winds are oversimplified Effects of continents or seasons not accounted for Upper-level winds are more complicated than the model shows

Three-Celled Model Strengths Latitudes other than between 30° & 60° are fairly accurate Model is an average; good for climate studies (long-term pattern)

Wind and Pressure Belts Intertropical Convergence Zone (ITCZ): low pressure zone created by maximum heating at the equator principiojoanne2196.blogspot.com

Wind and Pressure Belts The ITCZ is hot & humid with little or no wind; rain is frequent (doldrums) tnhsprgteam.blogspot.com

Wind and Pressure Belts ITCZ encircles the Earth; migrates north and south depending on the season en.wikipedia.org

The ITCZ: Can U find it? http://cawcr.gov.au/bmrc/clfor/cfstaff/jmb/03May15a.html

Three-Celled Circulation Model www.newmediastudio.org