Lec14_GHG_other_than_CO2_POST

Lec14_GHG_other_than_CO2_POST - Lecture 14 Greenhouse...

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Lecture 14: Greenhouse Gases (GHGs) Other than CO 2 CHEM/ENVS 380 Apr 6, 2010 CO 2 CH 4 N 2 O O 3 H 2 O CFCs, HCFCs, HFCs Perfluorocarbons (PFCs) SF 6 Shine and Sturges, Science, 315, 1805-1806, 2007. 1. Get to know the above gases and how they contribute to the GHE. 2. Get to know the major sources of the above gases. 3. What is GWP, and what does it tell you? 4. Which GHG contributes most to the GHE? 5. Which GHGs contribute to the enhanced GHE?
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GWP vs Radiative Forcing Global warming potential (GWP) is “a measure of the relative radiative effect of a given substance compared to another, integrated over a chosen time horizon.” Consider instantaneous release of 1 kg of a GHG “x” and 1 kg of reference gas “r” (CO 2 ). GWP is the time-integrated radiative effect of GHG “x” relative to that of CO 2 . TH = time horizon a x = radiative efficiency of “x” (Wm -2 kg -1 ) [x(t)] = time-dependent decay in abundance of “x” Radiative forcing denotes “an externally imposed perturbation in the radiative energy budget of the Earth’s climate system.” E.g., changes in: solar radiation, GHG, and aerosol abundances From IPCC Third Assessment Report, Chapter 6.
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