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Page 1: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Wind Movement and Global and Local Winds

Page 2: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

In previous lessons, you learned that theuneven heating of Earth’s surface by the

Sun causes some areas to be warmerthan others.

Page 3: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

This uneven heating of land forms wind systems.

Page 4: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Wind is caused by differences in air pressure. Areas of high

pressure move to areas of low pressure.

Air pressure is related to density.

Page 5: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Which one has greater density? Greater pressure?

Greater DensityGreater Pressure

Lower DensityLower Pressure

Page 6: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

We will consider Density and Pressure to be the same.

What about temperature? What did you learn about

temperature and density?

Page 7: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Look at the images below. Identify which image has: Higher Temperature, Higher

Density, Higher Pressure.

Higher Temperature Lower TemperatureLower Density Higher DensityLower Pressure Higher Pressure

Page 8: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Temperature, Density and Pressure

Temperature decreases

Densityincreases,Pressure increases

Temperatureincreases

Density decreases,Pressure

decreases

Page 9: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Wind is caused by differences in air pressure.

Areas of high pressure move to areas of low pressure.

Let’s apply these concepts back to wind.

Page 10: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

In which direction would the wind move below.

Higher TemperatureLower DensityLower Pressure

Lower TemperatureHigher DensityHigher Pressure

Page 11: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Why?

Higher TemperatureLower DensityLower Pressure

Lower TemperatureHigher DensityHigher Pressure

Page 12: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Think of it this way…matter naturally wants to move from where it is crowded to where it is less crowded. This concept is true for all

of science.

Higher TemperatureLower DensityLower Pressure

Lower TemperatureHigher DensityHigher Pressure

Page 13: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Particles naturally want to move from where they are more crowded

to where they are less crowded.

13

Page 14: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Which areas of the earth have air that islow pressure (low density)? Why? What

about high pressure (high density)?

Page 15: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Summarizing:

Turn to a seat partner and describe how wind moves.

Together discuss the following question: What makes wind

travel at faster speeds?

Page 16: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Differences in density and pressure cause wind and air movement. The greater the

difference the faster the wind. Themovement of air occurs in convection

currents.

Convection currents are simply the transfer of heat by the circulation or

movement of the heated parts of a liquid or gas.

Page 17: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Everyday Examples of Convection Currents

Page 18: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Large Convection Currents are formedbecause of the temperature differencesbetween the equator and the poles. This

produces global wind systems.

Page 19: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

The sinking of cold, dense air and the rising of warm, less dense air do not explain everything about

wind.

What other factor have we discussed previously that affects

the direction of winds on the earth’s surface?

Page 20: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Surface winds and surface currents are affected by the rotation of the Earth

(the Coriolis Effect)

Because Earth rotates toward the east, winds appear to curve to the right in the northern hemisphere and to the left in

the southern hemisphere

Page 21: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

The effect of the earth’s rotation (Coriolis Effect) on Winds

Page 22: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

The flow of air caused by unequal heating of the Earth’s surface and the rotation of the Earth (Coriolis Effect)

creates distinct wind patterns on Earth’s surface.

These wind systems not only influence the weather, they also

determine when and where ships and planes travel most efficiently.

Page 23: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Coriolis Effect

Activity

Page 24: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Below is a diagram showing

the global wind

patterns that

distribute heat and moisture around

the globe.

Page 25: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface
Page 26: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Global wind systems determine the major weather patterns for

the entire planet.

Smaller wind systems affect local weather. Two such wind systems are sea breezes and land breezes.

Page 27: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Look at the temperatures of the land and the sea in this diagram. Which

direction would the wind blow? Why?

85°F65°F

Low Pressure

High Pressure

Page 28: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

A sea breeze occurs when wind is moving from the sea towards land.

85°F65°F

Low Pressure

High Pressure

Page 29: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Land heats up and cools down faster than water.

How does this affect wind?

Page 30: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

At night when the earth’s surface is no longer being heated by the sun,

the land cools much more rapidly than ocean water. What happens to the wind?

65°F55°FHigh Pressure

Low Pressure

Page 31: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

A land breeze occurs when wind is moving from the land to the sea.

65°F55°FHigh Pressure

Low Pressure

Page 32: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

How do sea breezes and land breezes affect local weather?

Page 33: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Sea Breeze

Land Breeze

Page 34: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Identify which diagram

illustrates a Sea Breeze and a Land

Breeze. Explain why. Include high

and low air pressure in your

explanation.

Page 35: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Label and draw the following in the diagrams on your notes: sea breeze, land breeze, high pressure, low

pressure, arrows showing the direction of the wind.

Page 36: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

Sea BreezeLand Breeze

High Pressure

Low Pressure

Low Pressure

High Pressure

Page 37: Wind Movement and Global and Local Winds1).pdf · 2017-02-26 · Wind Movement and Global and Local Winds. In previous lessons, you learned that the uneven heating of Earth’s surface

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