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Global and Local Winds

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Air Movement

Wind is the movement

of air caused bydifferences in air pressure

The greater thedifference, the faster the

wind moves

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Air Pressure

Differences in air pressure

are caused by the unevenheating of Earth

Uneven heating producespressure belts which

occur every 30 latitude

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Pressure Belts

As warm air rises at the

equator and moves towardthe poles, it cools

As it cools, some of the airsinks around 30 north

and south of the equator

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Pressure Belts

At the poles, cold air

sinks and movestowards the equator

Around 60 north andsouth, the air begins to

heat u and rise

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Global Winds

The combination of pressure

belts and the Coriolis Effectcause global winds

These are polareasterlies, westerlies,

and trade winds

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Polar Easterlies

Wind belts that extend from

the poles to 60

latitudeFormed from cold sinking air

moving from the polescreating cold

temperatures

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Westerlies

Wind belts found between

30

and 60

latitudeFlow towards the poles

from west to east carryingmoist air over the Unites

States

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Trade Winds

Winds that blow from

30

almost to theequator

Called the trade windsbecause of their use by

earl sailors

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Doldrums

Located along the

equator where nowinds blow because

the warm rising aircreates and area of low

ressure

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Horse Latitudes

Occur at about 30 north and

south of the equator wherethe winds are very weak

Most deserts on the Earth arelocated here because of thedry air

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Local Winds

Generally move short

distances and can blowin any direction

Caused by geographicfeatures that produce

tem erature differences

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Sea Breezes

High pressure is created over

the ocean during the day andlow pressure over land due touneven heating

Air moves from the ocean tothe land creating a sea

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Land Breezes

Low pressure occurs over the

ocean during the night andhigh pressure over land due tothe uneven heating of earth

This causes wind to move fromthe land to the ocean creating

a land breeze

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Question 1

What causes winds?

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Answer

Winds are caused by the

uneven heating ofEarths surface, which

causes pressuredifferences

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Question 2

What are the three types

of global winds?

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Answer

Polar Easterlies

WesterliesTrade Winds

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Question 3

What is the difference

between a land breezeand a sea breeze?

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