JEG100H1 Chapter 4: Earth's Surface Energy Balance (Introduction to Physical Geography and Earth Sciences. Pearson Custom Library.)

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Earth Sciences
Sarah Finkelstein

Sept 20 , 2016 Earths Surface Energy Balance (Chapter 4 ) What happens to incoming radiation? What happens to outgoing radiation? How is the net radiation (energy) available at the surface used? Why its important: We need to know the amount of energy available to power Earth systems, and the effects of anthropogenic surfaceatmosphere changes on radiation budgets and the climate Simplified Earthatmosphere energy system Fate of Incoming Solar Radiation (Shortwave) Scattering Scattering: Gas molecules and dust physically interact with insolation to redirect and disperse incoming radiation in all directions Gas air molecules interact with short wavelengths and scatter those wavelengths Scattering accounts for a percentage of insolation that does not reach Earth but is reflected back to space Incoming radiation that reaches Earths surface after scattering is diffuse radiation Direct radiation travels in a straight line to Earths surface without being scattered or affected by materials in the atmosphere Once Earth absorbs the short wave radiation, it emits radiation in the long wave radiation Stays within the Earths system, greenhouse effect (does not go back to space) Equator receives most solar radiation Aerosols scatter all wavelengths of visible light Gas molecules scattering depends on wavelength
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