PHYC40050-L07-PaleoClimate

PHYC40050-L07-PaleoClimate - 1 Introduction to Meteorology...

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Unformatted text preview: 1 Introduction to Meteorology & Climate Climate, Climate Change Nuclear Power and the Alternatives Introduction to Meteorology & Climate PHYC 40050 Peter Lynch Meteorology & Climate Centre School of Mathematical Sciences University College Dublin Climate, Climate Change Nuclear Power and the Alternatives Introduction to Meteorology & Climate Paleoclimate Based on lectures prepared by Dr Rodrigo Caballero UCD Meteorology & Climate Centre Lecture 7 Lecture 7 Introduction to Meteorology & Climate What controls surface What controls surface temperature on Earth? temperature on Earth? insolation some reflection thermal radiation Introduction to Meteorology & Climate Black body radiation Black body radiation A black body: 1) absorbs all radiation falling on it (i.e. no reflection) 2) emits radiation according to the Planck function: Total emission per unit area is I = T 4 Introduction to Meteorology & Climate The bare rock temperature The bare rock temperature In steady state , E in = E out E in = R 2 S (1 ) E out = 4 R 2 T 4 R = radius =albedo Putting it all together: 2 Introduction to Meteorology & Climate Does it work? Does it work? Well, sort of 210 210 210 210 Mars Mars 440 440 440 440 Mercury Mercury 740 740 232 232 Venus Venus 288 288 255 255 Earth Earth Bare rock temp (K) Observed surface temp Introduction to Meteorology & Climate Greenhouse effect: how it works Greenhouse effect: how it works z temp T s sunlight goes all the way down and heats surface temperature decreases with height lapse rate is controlled by thermodynamics and turbulent heat transport thermal radiation can escape to space only from the emission level (~6 km high) T e S (1 )/4 T e 4 Introduction to Meteorology & Climate Which are the greenhouse gases? Which are the greenhouse gases? Constituent Fraction (%) Nitrogen (N 2 ) 78.08 Oxygen (O 2 ) 20.95 Argon (Ar) 0.93 Carbon dioxide (CO 2 ) 0.038 Methane (CH 4 ) 0.0002 Ozone (O 3 ) 0.00001 Water vapor (H 2 O) 0 5 (variable!!) only these interact with thermal radiation Introduction to Meteorology & Climate Greenhouse effect: good or bad? Greenhouse effect: good or bad?...
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This note was uploaded on 01/31/2011 for the course PHYC 40050 taught by Professor Staff during the Summer '08 term at UC Davis.

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PHYC40050-L07-PaleoClimate - 1 Introduction to Meteorology...

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