Unformatted text preview: * Varying albedos that exist on Earth’s surface. Daytime heating: Warms the surface Air expands in volume and decreases in density As density decreases, air will rise and lower the atmospheric pressure at the surface Thermally induced rising of warm air contributes to the low pressures that dominate the equatorial regions If air becomes cold: There will be an increase in density and a decrease in volume This causes the air to sink thus increasing the atmospheric pressure Polar regions regularly experience high pressure. Horizontal Differences in Pressure The difference between the highest and lowest sea level pressures over North America on a given day might amount to only 25 mb. Although horizontal differences in pressure can generate violent winds, these differences are small compared to vertical differences....
View Full Document
This note was uploaded on 06/12/2011 for the course GEOGRAPHY 600-201010 taught by Professor Christopherpost during the Spring '10 term at Kent State.
- Spring '10