INTRO

Objective 02/14/2013

Describe global wind patterns.

What causes the wind to blow? Does it always blow in the same direction?

WIND

Wind

Wind

Why does air move?

Differences in air pressure create wind Air moves from

HIGH to LOW pressure

Due to uneven heating of Earth

Ch. 15, Sec. 3, QC

1

Wind

Where are Pressure Belts?

Bands of high and low pressure

On latitudes at every 30° on the earth

Let’s add to our diagram!

Ch. 15, Sec. 3, QC

2

Wind

Coriolis Effect The curving of wind due to the Earth’s rotation

Let’s add to our diagram!

Ch. 15, Sec. 3, QC

3

Coriolis Force

Wind

Global Winds Polar Easterlies Westerlies Trade Winds

The Doldrums Horse Latitudes Let’s add to our

diagram!

Wind

Jet stream Narrow belt of strong winds that blow in upper troposphere

Can reach max. speed of 300mph

Affects movement of storms and even planes!

Global Atmospheric Circulation Model

Winds

Sea Breeze

Land Breeze

During the day, land warms faster than water, so the warm air rises

Cool air comes in from the ocean

Water warms slower than land, so by nightfall, warm air rises above the ocean

Cool air then comes in from the land

Ch. 15, Sec. 3, QC

5

Wind

Mountain and Valley Breezes

Warm air moves UP the mtn. during day

Cold air moves DOWN the mtn. during night

Wind

Summary Why does air move? Does all air move the same? Give an

example.

Objective 02/14/2013

Outro

Describe global wind patterns.

Why is it always a good time to fly a kite at the beach?