Geo Jan 19 - Geography Extra help on Thursday classes...

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Geography January 19, 2010 Extra help on Thursday classes directly after class Earth and Sun Compare the Earth and Sun (Figure 2.7) Sun's Radiative Output - dominated by: ultraviolet, visible, and near infra-red Shortwave Radiation (Symbol = K), a collective term for radiation from the sun Earth's Radiative Output - Dominated by: Thermal infra-red Long-wave Radiation (Symbol = L), a term for radiation from the earth Is the Earth a Blackbody? Blackbody = any surface that absorbs radiation and emits its own - The surface is with respect to long-wave radiation but not the atmosphere - The surface is... the atmosphere is not Net Radiation (Symbol = Q*) - Net Radiation (Q*) is the balance between incoming and outgoing radiation (e.g. shown on Figure 2.8) INPUT = Solar radiation to Earth The difference between the amount of energy coming in and the amount of energy coming out - if positive (more energy coming in than going out) = its going to heat up What are the shortwave terms in the balance? - incoming shortwave radiation from the sun - some is absorbed into the atmosphere or reflected and scattered into space
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