24 1 the atmosphere
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24.1 The Atmosphere. 1. Define the atmosphere… 2. What molecule has the highest concentration in the atmosphere? ( oxygen, Carbon dioxide, nitrogen?) 3. Why is the atmosphere important? (3 things). The atmosphere is … t he layer of gases that surround the earth.

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24.1 The Atmosphere

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24 1 the atmosphere

24.1 The Atmosphere


24 1 the atmosphere

1. Define the atmosphere…

2. What molecule has the highest concentration in the atmosphere? ( oxygen, Carbon dioxide, nitrogen?)

3. Why is the atmosphere important? (3 things)


24 1 the atmosphere

  • The atmosphere is … the layer of gases that surround the earth


The function of the atmosphere

The Function of the Atmosphere:

  • Holds Heat and helps moderate Earth’s temperatures

    b. Provides Protection from …

    • Meteoroids

    • High Energy Radiation (UV rays) from the sun

      c. Provides gasses essential for life

    • Oxygen

    • Carbon dioxide

    • Nitrogen


Composition of the atmosphere

Composition of the Atmosphere

a. Nitrogen (78%), oxygen (21%), other gases and water vapor (1%)

b. Suspended Solid and liquid particles Ash and smoke from fires or volcanoes

  • Salt from ocean spray


Ozone layer

OZONE LAYER

  • Ozone in Troposphere = “Bad” ozone

    1. Acts as greenhouse gas (traps heat) and causes smog.

    b. Ozone in Stratosphere= “Good” ozone

    1. Made of O3 molecules

    2. absorbs UV rays that can be harmful to plants and animals

    3. UV radiation is Thermal Energy which warms strato.

    c. OZONE HOLE = Thinning of ozone layer

    1. Where: over poles

    2. Cause:chemicals, CFCs (Chloroflourocarbons), used as coolants in refrigeration and aerosols, get into atmosphere and break apart ozone molecule … allowing more UV in.


Air pressure the force on a surface due to the weight of air

Air Pressure: the force on a surface due to the weight of air

a. The atmosphere has weight because of gravity

b. As altitude increases, air pressure and density decreases

c. Measured with a barometer


Layers of the atmosphere

Layers of the Atmosphere

  • Troposphere:

    1. 0-12km (~ 7 mi)

    2. Weather & Clouds

    3. Greatest air pressure & density

    (Gravity pulls air to surface)

    4. Temp. DECREASES

    with altitude (As air expands it cools)


Stratosphere

Stratosphere

  • 12 km – 50 km(~ 32 mi)

  • Contains ozone layer

    3. Temperatures WARM from -57C to 0C.

    4. Upper strat. is warmer than lower b/c of OZONE LAYER which is absorbing UV radiation

http://www.youtube.com/watch?v=FHtvDA0W34I


Mesosphere

Mesosphere

1. 50-80 km (~52 mi),

2. Temps decrease as altitude increases

3. Top of Meso. Is - 90 C

4. Very thin air – moving VERY FAST. Windy (320 km/hr).

5. This burns up meteoroids


Thermosphere

Thermosphere

1. OUTER MOST LAYER

2. 80 km – outer space

3. TEMP INCREASES w/ Alititude. ( - 90 C to more than 1000 C)

4. Temps. Increase because gas molecules in this layer absorb solar radiation


Ionosphere

Ionosphere

  • Part of THERMOSPHERE

  • Region of charged particles (ions) that overlaps the lower thermoshere.

  • Molecules absorb solar energy and b/cm (+) charged or IONS.

  • Aurora – Charged particles are attracted to E’s mag. Poles – collide w/ ions & glow


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