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Why Air Moves. Wind is created by differences in air pressure. Bigger difference = faster wind. Caused by unequal heating of earth. Air. The air by the equator is warm and rises. Low pressure. The air by the poles is cold and dense. ID: 537082Direct Link: Link:https://www.docslides.com/lois-ondreau/wind-notes- Embed code:
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Why Air Moves
Wind is created by differences in air pressureBigger difference = faster windCaused by unequal heating of earthSlide3
The air by the equator is warm and risesLow pressureThe air by the poles is cold and denseHigh pressureWind will then travel from poles to equatorMove from area of high pressure to area of lowSlide4
Wind travels in small belt pattersIt never travels too far because it will cool as it moves and sink back downMoves at a about 30 degrees at a time or down the earthSlide5
s rotation affects wind direction
Without the earths rotation the global winds would flow directly from the poles to the equator. Coriolis EffectInfluence of Earth’s rotation on objects that move over Earth.Slide6
The Coriolis Effect
The wind does not travel perfectly north to southEarth’s rotation causes wind to travel in a curved pathSlide7
Global winds curve as Earth turns beneath them.
Winds curve to the rightSouthern HemisphereWinds curve to the leftOnly noticeable for winds that travel long distances.Causes global winds to travel along 3 routes in each hemisphereRoutes are called global wind beltsSlide8
Types of Wind
Local windSea BreezeLand BreezeMonsoon – Seasonal changes in windGlobal windDoldrums / Horse LatitudesEasterlies / WesterliesJet StreamBoth caused by uneven heatingSlide9
The distance winds travel varies.
Some winds die out quickly
Global windsWinds that travel long distances in steady patterns over several weeksCaused by uneven heating between the equator and the north and south poles
Sunlight is concentrated near the equator because it strikes the surface directly
Sunlight is more spread out near the poles because it strikes at a lower angleSlide10
Global Winds Continued
Near the equator concentrated sunlight heats the surface to a high temperature. Warm air rises, producing low pressure.
In regions closer to the poles, the sunlight is more spread out. The air above them is cooler and dense. Sinking dense air produces high pressure that sets global winds in motion.Slide11
Low-pressure zones near equator
The rising, moist air produces clouds and heavy rain.Horse LatitudesHigh-pressure zones located 30 degrees north and south of the equator.Clear and dry weatherSlide12
effect creates 3 wind belts
in each hemisphereTrade WindsBlow from east. Move towards equator. Die out as they near the equatorWesterliesBlow from the west. Move towards the poles. Brings storms across much of the U.S.EasterliesBlow from the east. Move towards mid-latitudes. Storms occur when cold air from easterlies meets the warm air of the westerlies.Slide13Slide14Slide15
Effects of Wind on Travel
How would wind effect travel?
Sailors used to dread traveling through the doldrums and the horse latitudes because there
wasn’t enough wind.To avoid the calm regions, sailors sought out global wind beltsSailors rely on trade winds to get across the oceanSlide16
Jet streams flow near the top of the troposphere
Flow in upper troposphere
Travels west to eastOften moves at high speeds (greater than 124 mi/hr).Form because Earth’s surface is heated unevenly.Loop north and southSlide17
Each hemisphere has 2 jet streamsSubtropical jet streamFlow closer to poles in SUMMERPolar jet streamHas a strong influence of weatherCan pull cold air down from Canada or pull warm air up.Strong storms form along its loopsSlide18
Patterns of heating and cooling cause local
Some winds change daily in a regular pattern.Blow within small areasLand breezes and Sea breezes are similar but opposite.Slide19
Land Breeze / Sea BreezeSlide20
Wind blows from the land to the oceanHappens during the NightLand cools down causing it to have a low air pressureWater maintains its temperature causing it to have a higher air pressureAir will move from high pressure to low pressureIt will move from the land to water