Lecture 8 Energy Budget
Lecture 8 Energy Budget 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 28 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 8 Energy Budget Energy Budget A complex system of energy uxes representing where energy is re ected and absorbed with in the Earth system Planetary Energy Balance There is a balance between the amount of incoming solar energy absorbed by the earth and total outgoing radiation emitted by the earth Simple Energy Budget All incoming shortwave equals all outgoing long wave radiation earth would be freezing with this budgeU If there is no atmosphere Then all long wave radiation would be transmitted out to space gh gases emit radiation upward which mostly balances solar Incoming shortwave radiation minus re ected and outgoing long wave radiation almost balances at the top of the atmosphere Average of 341 wm2incoming solar radiation the top of the atmosphere 341incoming102re ected239outgoing Where and how is energy balance measured Satellite measurements show incoming solar radiation and outgoing long wave radiation Humans measure it at the earth s surface Earth 5 temperature varies around Earths surface 1 Incoming solar radiation based on earths curvature 2 Earth s re ectivity and cloud cover albedo 3 Warming provided by gh gases Albedo Amount of shortwave radiation re ected by a surface Depends on property of the surface Land can have a lot of vadathy Forests have low albedo Water is dark colored and absorbs most incoming shortwave radiation High albedo Very re ective LOW albedo Low re ective absorbs a lot of shortwave radiation Clouds 1 They are bright and white high albedo and re ect incoming solar radiation They absorb outgoing Infrared radiation and contribute to the greenhouse effect Incoming Solar Radiation 1 Re ected by clouds 2 Re ected by the surface Ucysandy 3 Absorbed in the atmosphere UV 4 Absorbed by the surface Outgoing Long Wave Radiation 1 Absorbed by greenhouse gases 2 Radiated back to earth by greenhouse gases 3 Radiated out to space by greenhouse gases 4 Passed directly through the atmosphere atmospheric window The components are interconnected in the enhanced greenhouse effect Warmer surface temperatures Melting ice caps Increases absorption of solar radiation Warmer temps Label what happens to incoming solar radiation and outgoing longwave radiation The arrow in the middle represents latent heat and sensible heat convection upwards in the atmosphere 5 s r Reflected Solar incoming V Outgoing 5 Radiation Solar 39 Longwave 39 1019 Wm2 Radiation Radiation I 3413 w m392 2335 w m 2 Hair d V 4 ckou quot V 2 Passesth MmOSK W i 12quot noose quot 3 0i 523 u uni es 0 39 anhqu 9 we gtw er 5 outgoing radiation 09 absorbed 0 10035 quot5ch 3413 incoming radiation 1019 reflected 238
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