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21AtmosphereClimateChange10.pdf.edu - 1 Global Climate...

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Unformatted text preview: 1 Global Climate Change The Troposphere Altitude: 0 to 16 km(10 mi) Properties: Contains 80% of the mass of the atmosphere. Site of weather processes. Temperature and pressure decrease with altitude. The Tropopause forms the upper boundary The Stratosphere Altitude: Properties: The Stratosphere Altitude: 16 km to 50 km Properties: Temperature nearly constant but increases in the ozone layer. Nearly free of clouds and weather. Contains the ozone layer Atmospheric composition N2 78% O2 21% H20 1% Ar 1% CO2 CH4 N20 O 2 2 21% 21% N 2 2 78% 78% Atmospheric composition N2 O2 H20 Ar CO2 CH4 N20 O 2 N 2 78% 21% .01 to 1% 1% 350 ppm 1.7 ppm 300 ppb 2 Global Climate Change Do we currently have a greenhouse effect? Global Climate Change Without a greenhouse effect earth's surface would be 33 o C cooler. Greenhouse gases Greenhouse Atmospheric gas lifetime Water vapor 1 - 3 wks Carbon dioxide 50 - 200 yrs Methane 10 yrs Nitrous oxide 150 yrs CFC's 7 - 400 yrs Trace gas contributions to global warming Gas [ppm] % Contribution Warming potential ___________________________________________ CO 2 353 60 1 CH 4 1.7 15 21 N 2 O 0.3 5 300 CFC's 0.00076 20 6000 ____________________________________________ Contributions to climate change CO2 CH4 N2O CFC's CO CO 2 CFC’s CFC’s CH CH 4 N 2 O Enhanced greenhouse effect Resulting from long-term increases in greenhouse gases caused by human activities 3...
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This document was uploaded on 11/04/2011 for the course PWS 150 at BYU.

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21AtmosphereClimateChange10.pdf.edu - 1 Global Climate...

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