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Atmosphere & Climate

Mr. Sierra. Atmosphere & Climate. Part 1. Margaret Mead:. “The atmosphere is the key symbol of global interdependence”. What did Margaret mean by that statement? What is it that makes our atmosphere so important? EcoLog Question #1 on p.172:

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Atmosphere & Climate

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  1. Mr. Sierra Atmosphere & Climate Part 1

  2. Margaret Mead: “The atmosphere is the key symbol of global interdependence”. • What did Margaret mean by that statement? • What is it that makes our atmosphere so important? EcoLogQuestion #1 on p.172: • Why do you think the warming of Earth by gases such as Carbon Dioxide is called “the greenhouse effect”?

  3. Composition

  4. CO2 Carbon Dioxide cellular respiration photosynthesis

  5. CO2 Carbon Dioxide Organisms absorboxygen as they break down food molecules during cellular respiration.Carbon dioxide is released into the atmosphere. Plants and bacteria get their food by absorbing water and carbon dioxide during photosynthesis, using sunlight for energy. They releaseoxygen as a by-product. O2 O2 CO2 CO2

  6. CO2 Carbon Dioxide Typically measured in ppm which means Parts Per Million Today: 397 ppm http://co2now.org/ Industrial Revolution about 200 years ago Any guess where it is today?

  7. CO2

  8. Layers of the Atmosphere

  9. Layers of the Atmosphere Thermosphere - Water Vapor Weather

  10. Ozone The protective layer of stratospheric ozone absorbs over 99% of incoming UV-B and UV-C radiation. • Ozone is beneficial in the stratosphere but dangerous in the troposphere. • Ground level ozone is classified as a pollutant because it reduces lung functionality AND it can degrade plant surfaces. • The smog that frequently exists in major metropolitan areas such as Los Angeles, CA is known as brown smog and consists primarily of ozone.

  11. Ozone • The depletion of ozone is largely due to chlorofluorocarbons (CFCs) - also commonly known by the DuPont brand name Freon. These were mostly used in aerosol cans (spray paint and air fresheners) • The Montreal Protocol in 1987 was an international agreement that allowed for a reduction, and eventual elimination, of CFC production (at least within the 197 participating countries).

  12. Ozone Ozone is depleting over Antarctica - faster during August through November (when it’s spring in the southern hemisphere)

  13. Ozone • http://www.sy.jagoo.us/ozone-hole-over-antarctica • http://www.nasa.gov/vision/earth/environment/ozone_resource_page.html • http://www.ucar.edu/learn/1_6_2_25t.htm

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