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Exploring Planets and Earth. Yuk Ling Yung Caltech. Venus (Stability of CO2 atmosphere) McElroy, Sze and Yung 1973 Yung and DeMore Icarus 1982 CO2 is unstable against UV A tiny amount of Cl (< 1ppm) Catalytically oxidizes CO back to CO2 via the peroxychloroformyl - PowerPoint PPT Presentation
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Exploring Planets and Earth
Yuk Ling Yung
Caltech
Venus (Stability of CO2 atmosphere)
McElroy, Sze and Yung 1973Yung and DeMore Icarus 1982
CO2 is unstable against UV
A tiny amount of Cl (< 1ppm)Catalytically oxidizes CO back to CO2 via the peroxychloroformyl radical (ClCO3)
Titan = Prebiotic Earth?
Titan: Moon of Saturn
1.5 bar N2, 95K
Yung et al 1984
Organic synthesis
CH4 + UV = CxHy
C2H6 Lakes predicted by Lunine, Stevenson and Yung 1983; observed by Cassini 2010
Global Climate Change
Three leading anthropogenic greenhouse gases
CO2
CH4
N2O
Habitability
Wang, Yung et al. 1976
Yung et al. 1976
First global map of CO2 from AURA satellite
Chahine, .. Yung, 2008
V2x
8
Li, …Yung 2009Time 15 June 2009
9
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