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Day 42 Investigation 8 part 2 What Causes Wind
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Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Jan 14, 2016

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Page 1: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Day 42

Investigation 8 part 2

What Causes Wind

Page 2: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Convection Chamber Review

Conclusion

Warm, less-dense air rose; Cooler, denser air sank

Creates a convection cell

Air sinks because it is denser

Air warmed by candle rose to the top because it is less dense

Air is cooled at the top of the chamber because of the ice

Page 3: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Review Convection Cell on EarthWhere on Earth’s surface could a convection cell develop?

Where Earth’s surface is warm

•Desert

•Tropical ocean

Page 4: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

What happens to air pressure

If warm air less dense and rises, what effect do you think that has on air pressure on the ground?

1. As air warms, it expands.

2. Air rises

3. There is less air pushing down

4. Air pressure decreases

Page 5: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

What happens to air pressureIf cool air denser and sinks, what effect do you think that has on air pressure on the ground?

1. As air cools, it contracts.

2. Air sinks

3. There is more air pushing down

4. Air pressure increases

Page 6: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Wind

• How can air move sideways across the surface of the Earth?

Page 7: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Wind?

• How is wind made?–Differential heating of Earth’s surface–Energy transfer (radiation, conduction, convection)–Air pressure–Density

• Cause wind?

Page 8: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Wind Concepts

• Differential heating and cooling affects energy transfer to and from the atmosphere

• Warm air expands and is less dense

• Cool air contracts and is denser

• Rising warm air and sinking cool air produce convection currents

Page 9: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Wind Concepts (part 2)

• Dense air produces high-pressure areas, less-dense air produces low-pressure areas

• Differences in atmospheric pressure causes air to move

• Air moving across Earth’s surface is wind

Page 10: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Differential heating and cooling off affects energy transfer to and from the atmosphere

Warm air expands and becomes less dense

Cool air contracts and becomes denser

Rising warm air and sinking cool air produce convection currents

High pressure area

Low pressure area

Wind Concepts

Differences in atmosphere pressure causes air to move

Air moving across Earth’s surface is wind

Page 11: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Multimedia

• Watch the different types of local winds.

• On pages 48 and 49 of the student lab book draw an illustration of the local winds after previewing the multimedia.

Page 12: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

• Local weather conditions influence local winds

Which absorbs and releases solar energy faster, landmasses or water?

Energy transfer to and from the air in the atmosphere:1. Conduction (air molecules make contact with land

and water surfaces)

2. Reradiation of energy from the surface

Page 13: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

• What happens to air when it is heated?

Air expands and

becomes less dense

What happens to air pressure over the land when air warms and expands? Pressure decreases, local

low pressure forms

Page 14: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Wind

• The horizontal movement of air from an area of high pressure to an area of lower pressure

Page 15: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Naming Local Winds• Local winds are

named based on the direction they come from

• A North wind is blowing from the North to the South

Page 16: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Sea Breeze

• Occurs during the day.

• The flow of air from an ocean or lake to the land.

Page 17: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Land Breeze

• Occurs at night

• The flow of air from land to a body of water.

Page 18: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Valley Breeze

Occurs during the day when air over the mountains heats and rises

The flow of air from the valley up through the mountain

Page 19: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Mountain Breeze

Occurs at night when air cools high in the mountains and sinks into valleys

Page 20: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Labels and Arrows

Visualization Exercise 8.3

Page 21: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Resources, P. 54

Page 22: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Color, Labels, and Arrows

Visualization Exercise 8.4

Page 23: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Images: CD-Rom

Page 24: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Arrows, Color and Real vs Diagram

Visualization Exercise 8.5

Page 25: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Resources, P. 58

Page 26: Day 42 Investigation 8 part 2 What Causes Wind. Convection Chamber Review Conclusion Warm, less-dense air rose; Cooler, denser air sank Creates a convection.

Reading

• Starting on page 53 of your resource book read “Where the Wild Winds Blow”.

• Answer the “Think Questions” on page 55.