CH 304K 1st Edition Lecture 24 Outline of Last Lecture I. Percent CompositionOutline of Current Lecture II. Global Warming PotentialIII. MethaneIV. Nitrous OxideCurrent LectureGlobal Warming Potential (GWP)- Only on a per molecule basis- Shows relative contribution to global warming- CO2 is the basis of the scale, GWP=1- Accounts for how efficient the molecule absorbs IR and the average lifetime of the molecule in atmosphere- It does NOT account for abundanceMethane, CH4- Greenhouse gas- GWP= 21, lifetime= 12 years- Modern concentration is double what it was pre-Industrial Revolution- Natural sources: leakage of natural gas, decaying vegetable matter, animal/insect flatulence, methane hydrate in permafrost- Human activity sources: extraction of gas and petroleum landfills, agriculture- rice paddies, ruminant animalsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Nitrous Oxide, N2O- Aka: laughing gas- GWP= 310, lifetime= 120 years- Abundance is low, but rising- Depleted in stratosphere and created in troposphere- GW effect at max in upper troposphere, min in
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