Presentation on theme: "Air Masses and Winds. Air Masses Air Mass = large body of air that takes on characteristics of the area over which it formed Conditions: Over land = dry."— Presentation transcript:
Winds When air is heated: Its density decreases Warm air rises, produces an area of low pressure Cooler, denser air produces an area of high pressure, and moves in under rising air
Winds Wind: caused by uneven heating and cooling at the Earth’s surface Temperature differences create density differences, which create pressure differences Air moves from high pressure to low pressure, causing circulation of air
Local winds Blow from any direction Cover short distances Caused by differences in heating and cooling rates of land and water Land & Sea Breeze Animation
Local winds Sea breeze –during the day solar radiation warms the land more than water air moves inland from the ocean due to air over land heating up quicker (and is less dense than the ocean air) Land breeze –at night when cool air from land flows seaward air moves toward the ocean as the land air cools quicker
Global Winds Do all places on Earth receive the same amount of solar radiation? NO!! So on a small scale, uneven heating results in local winds such as land and sea breezes. What do you think this uneven heating will cause on a large scale?
Global Winds Global Winds! But factors other than simple temperature differences affect global winds…