15.1 the atmosphere
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15.1 The Atmosphere. The Water Cycle Continues. Learning Targets. Describe the importance of the atmosphere to our planet and its life Outline the role of the atmosphere in the water cycle List the major components of the atmosphere and know their functions - PowerPoint PPT PresentationTRANSCRIPT
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15.1 THE ATMOSPHEREThe Water Cycle Continues
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Learning Targets
1. Describe the importance of the atmosphere to our planet and its life
2. Outline the role of the atmosphere in the water cycle
3. List the major components of the atmosphere and know their functions
4. Describe how atmospheric pressure changes with altitude
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Significance of the Atmosphere #1
1.Provides the gases needed for life
2. Moves watera) Clouds and water vapor
3. Absorbs solar energya) Ozone layer
4. Regulates temperaturesa) Greenhouse effect
5. Transmits energya) Allows for sound
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Photosynthesis1. Plants turn CO2 and H2O into sugar and
O2
2. Plant sugars are the basis for all food chains
3. Put nearly ALL OXYGEN into the atmosphere
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Respiration1. All plants and animals need oxygen
2. Organisms turn O2 and sugar into energy, CO2, and water
3. Releases energy stored during photosynthesis
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Significance of the Atmosphere #2
1. Provides the gases needed for life2.Moves water
a)Clouds and water vapor3. Absorbs solar energy
a) Ozone layer4. Regulates temperatures
a) Greenhouse effect5. Transmits energy
a) Allows for sound
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Significance of the Atmosphere #2
1. Water spends about 9 days in the atmosphere as water vapor.
2. ALL weather takes place in the atmosphere
a) Weather – describes what the atmosphere is like at a specific time and place
i. Includes – temperature, wind, precipitation
b) Climate – long-term average of weather in a particular location
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Significance of the Atmosphere #3
1. Provides the gases needed for life2. Moves water
a) Clouds and water vapor3.Absorbs solar energy
a)Ozone layer4. Regulates temperatures
a) Greenhouse effect5. Transmits energy
a) Allows for sound
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Significance of the Atmosphere #3
1. Ozone – molecule composed of three oxygen atoms - O3
2. Absorbs Ultraviolet (UV) radiation a) Protects life
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Significance of the Atmosphere #4
1. Provides the gases needed for life2. Moves water
a) Clouds and water vapor3. Absorbs solar energy
a) Ozone layer4.Regulates temperatures
a)Greenhouse effect5. Transmits energy
a) Allows for sound
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Significance of the Atmosphere #4
1. Keeps Earth within an acceptable temperature range
2. Greenhouse gases trap heat in the atmosphere to help moderate global temperatures
a) Carbon Dioxideb) Methanec) Water vapord) Ozone
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Significance of the Atmosphere #5
1. Provides the gases needed for life2. Moves water
a) Clouds and water vapor3. Absorbs solar energy
a) Ozone layer4. Regulates temperatures
a) Greenhouse effect5.Transmits energy
a)Allows for sound
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Significance of the Atmosphere #5
1. Gases in the atmosphere takes up space and provides collisions to occur
2. Without an atmosphere:a) No sound – Why?
i. No collisions of moleculesb) Airplanes cannot fly – Why?
i. No atmosphere to hold it up
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Composition of Air1. Major gas components
a) Nitrogen: 78%b) Oxygen: 21%c) Argon: 0.9%d) Other: 0.1%
2. Also contains particles that allow water vapor to condensate on:
a) Water, soil, smoke – Condensation nuclei
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Composition of Air1. Humidity – amount of water vapor in
the air
2. Humidity varies around the worlda) Higher humidity at equatorial regions
i. Warm air holds more moisture than cooler air.
b) Lower humidity at polar regions – lower temperatures
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Components of the Atmosphere1. Altitude – atmosphere has
different properties at different elevations
2. Density – number of molecules in a given volume
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Components of the Atmosphere
1. Air density decrease with altitude – Why?
a) Gravity pulls gas molecules towards Earth’s center
b) Air is denser at sea level where gravitational pull is greater
i. Air piles up close to the earth’s surface
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Components of the Atmosphere1. Air (atmospheric) pressure –
force of air weighing down over a unit of area
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Components of the Atmosphere
1. What about the composition of air as altitude increases?
2. Major gas componentsa) Nitrogen: 78%b) Oxygen: 21%c) Argon: 0.9%d) Other: 0.1%
3. Composition stays the same with one exception – at 20- 40 km above the surface, there is a greater concentration of ozone molecules
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Movement of Air1. Hot air takes up more space
a) Less dense risesb) Hot means moving faster
2. What is the most important way heat moves around in the atmosphere?
Convection!
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