EES 108 Class 05

EES 108 Class 05 - Greenhouseeffectinanutshell

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Greenhouse effect in a nutshell Without atmosphere, surface of planet would have  “radiative equilibrium temperature” Heat in = Heat out  For earth, it’s 255K (0   F) Greenhouse gases in atmosphere absorb longwave  radiation Temperature at “top” of atmosphere  = radiative equilibrium temp Atmosphere radiates both up and down Earth’s surface gets extra heat Temperature at surface must be hotter  to get rid of extra heat Extra temperature = “greenhouse warming”
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What makes something a “Greenhouse  Gas? Transmits visible light Lets heat from sun through atmosphere Absorbs infrared light Blocks heat leaving earth’s surface Most important greenhouse gases on earth: Carbon dioxide Water vapor
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Flow of heat
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Contours Iso-lines (isopleths) Like contour lines on topographic map Connect points of equal value Temperature (isotherm) Standard: every 5 degrees F Pressure (isobar) Standard: every 4 millibar, starting at 1000 Humidity (isohyet, isodrosotherm) Etc. Closely spaced contours  = steep gradient = interesting weather
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Isotherms
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Principles 1. Draw isotherms at 5°F intervals 2. Isotherm should be fairly smooth  (no sharp kinks) 3. If one station is higher, one lower isotherm passes between them Frequently you must use artistic/scientific  judgment to compromise between (2) and  (3)
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This note was uploaded on 12/15/2011 for the course EES 108 taught by Professor Giligan during the Spring '11 term at Vanderbilt.

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EES 108 Class 05 - Greenhouseeffectinanutshell

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