ENVS 3010 Lecture Notes - Lecture 5: Shortwave Radiation, Anaerobic Digestion, Permafrost

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Learning objectives: be able to explain the greenhouse gas effect, be able to identify the most important greenhouse gases and their sources, understand why fossil fuels release such large amounts of carbon dioxide, main sources of ghg emissions. In the previous lecture, we discussed radiative forcings and the factors that affect radiative forcings such as clouds, aerosols, the surface (albedo), and atmosphere. Here, we will be looking into the greenhouse gas (ghg) effect, the carbon cycle, and anthropogenic ghg emissions. Solar energy travels to earth as short-wave radiation. Incoming short-wave radiation passes through the ghgs since their chemical structure does not interact with short-waves. This energy is then absorbed by the earth"s surface and some is re-emitted as long-wave radiation (heat). The long-waves travel back up into the atmosphere where they are absorbed and re- emitted in all directions by ghgs. The waves can bounce between ghgs out of the atmosphere or can be re-emitted back to earth.

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