Geo3 - IV. Energy Balance got clickers? recalling from last...

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Unformatted text preview: IV. Energy Balance got clickers? recalling from last class, the Stefan Boltzmann Law tells us that the emitted flux of radiation from a blackbody will go up with temperature (in K) as, a) linearly b) exponentially c) temperature times itself twice d) temperature times itself four times e) both b ) and d ) in other words the emitted flux of radiation is very sensitive to temperature at which it occurs reminders from last class the Earth approximates a blackbody, both absorbing and emitting radiation the Earth receives incoming radiation from the Sun at relatively short wavelength (hi- energy) the Earth emits radiation at relatively long wavelengths (lower energy) Earths incoming and outgoing radiation are approximately in balance everything emits, i.e.: F = ! T reminders from last class the Earth approximates a blackbody, both absorbing and emitting radiation the Earth receives incoming radiation from the Sun at relatively short wavelength (hi- energy) the Earth emits radiation at relatively long wavelengths (lower energy) Earths incoming and outgoing radiation are approximately in balance everything emits, i.e.: F = ! T 4 learning goals fates of incoming and outgoing radiation (transmission, reflection, and absorption) the concept of albedo (fractional reflectivity of a surface) incl. typical values of important surfaces the concept of energy balance mechanisms of selective absorption of radiation in the atmosphere knowledge of the main Greenhouse gases understanding of the origin and magnitude of the natural Greenhouse Effect fates of incoming radiation last class we described solar radiation reaching the top of Earths atmosphere CUs SORCE satellite measures TOA insolation to w/in ~0.1% avg. ~1366 W/m 2 fates of incoming radiation about half is transmitted thru the atmosphere to the surface, and....... transmission reflection absorption absorption amounts are given vs. 100 arbitrary units, i.e. as % values fates of incoming radiation ~30% of incoming radiation is reflected back to space this fractional reflectivity is called the albedo the global or planetary albedo is the fractional reflectivity of the Earth system as a whole...
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This note was uploaded on 04/12/2008 for the course GEOL 1060 taught by Professor Lehman during the Spring '07 term at Colorado.

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Geo3 - IV. Energy Balance got clickers? recalling from last...

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