GGR314H1 Chapter Notes - Chapter 1: Radiative Forcing, Organofluorine Chemistry, Chlorofluorocarbon
12 Jan 2020
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Everything above 0k. -273. 15oc emits energy in form of electromagnetic radiation. Absorption of radiation warms an object, emissions cools an object. Certain gases in atmosphere and clouds absorb infrared radiation emitted from surface. Causes climate to be 33oc warmer than otherwise. Co2, ch4, n2o, cfcs, hcfcs, hfcs, sf6 b. Emitting certain non-ghgs that react chemically in atmosphere to create surface ozone or extend lifetime and impact of other greenhouse gases i. Carbon dioxide has contributed to about half of increase in greenhouse effect. Co2 varied naturally between 190 and 300 ppmv over past 400,000 years. Has increased to 410 ppmv in past 200 years. Ch4 varied between 0. 35 and 0. 7 ppmv over past 160,000 years. Has increased to 1. 8 ppmv in past 200 years. 1. 3 prospects for future, scientific basis of concern. Future human induced climactic change depends on: a. b. Buildup of atmospheric greenhouse gas concentrations for given emission scenario and resultant reduction in emission of infrared radiation to space.
