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Published byMerryl Booth Modified over 7 years ago
6 Warm up Wrap up 7
4, 6 Warm up Wrap up 1,3,7 Greenhouse effect
The menu for today 6/26/2013 Greenhouse effect Ozone depletion Global warming Weather patterns changing
78% nitrogen 20.6% oxygen < 1% argon 0.4% water vapor 0.036% carbon dioxide traces gases: Ne, He, Kr, H, O 3 Methane, Nitrous Oxide
Greenhouse effect Heat from the planets surface is absorbed by greenhouse gases, and is re-radiated in all directions
Selected Greenhouse Gases Carbon Dioxide (CO 2 ) –Source: Fossil fuel burning, deforestation Anthropogenic increase: 30% i Average atmospheric residence time: 500 years
Selected Greenhouse Gases Methane (CH 4 ) –Source: Rice cultivation, cattle & sheep ranching, decay from landfills, mining Anthropogenic increase: 145% i Average atmospheric residence time: 7-10 years
Selected Greenhouse Gases Nitrous oxide (N 2 O) –Source: Industry and agriculture (fertilizers) Anthropogenic increase: 15% i Average atmospheric residence time: 140-190 years
Water Vapor Selected Greenhouse Gases
1. Shorter, high Energy wavelengths Hit the earths Surface 2. Incoming energy Is converted to heat
3. Longer, infrared Wavelengths hit Greenhouse gas Molecules in the atmosphere 4. Greenhouse gas Molecules in the Atmosphere emit Infrared radiation Back towards earth
Summary Greenhouse gases absorb infrared radiation and prevent it from escaping to space. Carbon dioxide, methane, and nitrous oxide are very good at capturing energy at wavelengths that other compounds miss
ozone layer layer in Earth's atmosphere which absorbs most of the Sun's UV radiation
Ozone depletion a steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere (the ozone layer
ozone-depleting substances. CFCs, freons, halons refrigerants, propellants (in aerosol applications), and solvents
Global warming the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation
Who has been paying attention WHY?
Greenhouse Effect & Global Warming The “greenhouse effect” & global warming are not the same thing. –Global warming refers to a rise in the temperature of the surface of the earth An increase in the concentration of greenhouse gases leads to an increase in the magnitude of the greenhouse effect. (Called enhanced greenhouse effect) –This results is global warming
Effects of global warming
Melting of ice/North and south pole change salt and fresh water variables
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