Lecture 7 Absorption Spectrum
Lecture 7 Absorption Spectrum GC 170A
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This 3 page Class Notes was uploaded by Gigi on Thursday September 24, 2015. The Class Notes belongs to GC 170A at University of Arizona taught by E. Bigio in Fall 2015. Since its upload, it has received 95 views. For similar materials see INTRO TO GLOBAL CHANGE in Global Studies at University of Arizona.
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Date Created: 09/24/15
Lecture 7 Atmospheric Absorption C02amp H20 They have the highest concentration in the atmosphere C02 burning fossil fuels oil coal natural gas H20 water vapor clouds everywhere in the troposphere Ozone 03 Natural in the stratosphere Freon CFC s Man made destroys the ozone layer in the stratosphere from aerosols Methane CH4 Cattle and rice cultivation Nitrous Oxide N20 Fertilizers What if there were no greenhouse gases no atmosphere The earth would be freezing Since the long waves emitted from the earth would not be absorbed and remitted back to earth to keep us warm Sun Shortwaves UV and visible light Ea h Infrared Radiation 100 of emitted Why does Earth emit 100 energy in IR part of the spectrum It has a temperature of 22 degrees Celsius 287 Kelvin wavelength that the blackbody emits depends on its temperature Absorption Spectrum Greenhouse gases absorb different wavelengths of energy depending on their structure 39 i It shows proportion of 1 V M ML 2 energy absorbed by D lJi greenhouse gases at M J particular wavelengths 513slim IiitzziiliiiiairtizliissfiijlifTisziizziiisiz533255r23 C02 Absorbs certain wavelengths of infrared radiation H20 Absorbs many wavelengths in infrared broader absorption spectrum Ozone 03 Absorbs incoming UV Nitrous Oxide N20 amp Methane CH4 Absorb speci c infrared wavelengths Windows where energy is not absorbed by 1 Visible Light why the atmosphere we can see 2 Atmospheric window allows a narrow band of long wave radiation to pass in infrared portion What do the blue areas on the spectrum The wavelengths of represent energy that are absorbed and emitted by the greenhouse gases in the atmosphere Enhanced Greenhouse effect C02 levels in the Natural lHlullTlllaln Enhanced atmosphere are Greenhouse Effect Greenhouse Effect increasing and this M retlea39tescaim im heatem j corresponds With intospate a I mmwam temperature Which part of the absorption spectrum is affected by the enhanced greenhouse effect Infra red
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