New Chapter(s) Fold a triangle divider Label it: Chapters 15, 16, & 17 - WEATHER.

New Chapter(s)

• Fold a triangle divider• Label it: Chapters 15, 16, & 17 - WEATHER

What do you know about the Atmosphere?

I. The Atmosphere

A. Why is it important?1. Without it, life would not be able to exist2. Contains Oxygen3. Keeps water in liquid state

B. What is it made of?1. Mostly Nitrogen (78%)2. Oxygen (21%)3. Other Gases (like CO2, Methane,

& Water Vapor )(1%)

I. The Atmosphere

C. What does it look like?1. Air has

a. Mass b. Pressurec. Density

2. Layered3. Transparent

I. The Atmosphere

D. Air Pressure1. The result of the weight of a column of air

pushing down on an area2. Changes with altitude3. Measured with Barometers

I. The Atmosphere

E. Layers1. Troposphere

a. Where weather occurs

2. Stratospherea. Contains the ozone layer

3. Mesospherea. Protects Earth’s surface

from meteoroids

4. Thermospherea. Contains thinnest,

hottest, highest air

Remember:Temp. varies with altitude

Pressuredecreases with altitude

Densitydecreases with altitude

II. Energy in the Atmosphere and Heat Transfer

A. Energy from the Sun1. Energy is transferred to Earth via radiation2. Electromagnetic waves

II. Energy in the Atmosphere and Heat Transfer

B. Energy in the Atmos.1. Some is Absorbed

a. Water Vapor and CO2 – absorb infrared rad.

b. Ozone Layer – absorbs UVc. Clouds, dust and other gases

2. Some is Reflecteda. Clouds, dust and other

gases, b. Clouds = Mirrors

(White reflects Light)

UPDATE:Why is the Sky Blue?!

…Because of Scattering, which is reflection of light in all directions!

Light you see in the sky has been scattered by gas molecules

Gas molecules scatter short wavelengths of visible light more than long wavelengths!

Remember Heat Transfer???

Radiation Conduction Convection

When we talked about the Earth’s layers, we talked about the forms of heat transfer…Can you describe the characteristics of each?

Transfer of energy through an empty space

Heat transfer through direct

contact

Heat transfer by the movement

of a heated fluid

II. Energy in the Atmosphere and Heat Transfer

C. Heat Transfer in the Troposphere1. Occurs via Conduction, Convection and Radiation

• First few meters of the Trop. is heated by conduction

• Most heating caused by convection

• Convection currents move heat throughout the troposphere

HOMEWORK: Due Friday, 5-13-11

-Read pages 498-501, 509-514, 515-519-Answer #26-29 pg 522-523 -Read textbook pages 526-529, & 532-535 Section 1 Review, pg 529 # 2Section 2 Review pg 535 # 3Workbook pages 189-191 # 8, 10, 13, 16

pages 193-194 # 17-19