Lec04_AtmComposition_Structure

Lec04_AtmComposition_Structure - Units and Prefixes...

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Units and Prefixes International System of Units (SI Units): •Meter •Kilogram •Second CGS units (not in use) •Centimeter •Gram •second
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review Big Bang: 13.7 +/- 0.2 BY. Continuous formation and death of stars Solar system: 4.6 BY Fusion (releases heat) Æ early sun was 70% fainter than today Earth: liquid iron core Æ convection Æ plate tectonics, magnetic field Crab nebula observed by Chinese astronomers 1054AD; Anazasi wall paintings in Chaco Canyon, NM
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Geologic Time Scale Zoikos (Gk) = life Phanerozoic = visible life Prokaryotes: cell wall, no membrane around nucleus Eukaryotes: cell wall, nucleus bounded by membrane 4.6 BY 545 MY 2.5 BY 2.0 BY 65 MY 245 MY mammals reptiles Primitive prokaryotes Eukaryotes fish Marine invertebrates amphibians
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Rise of oxygen and other changes in the atmosphere Atm composition is controlled, to a large extent, by bio-geo- chemical processes Early sun’s energy ~70% today. With CO2 variations, climate went through “Ice Houses” and “Hot Houses” Pharenozoic
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Phanerozoic Climate CO2 Temperature Continental glaciation Crowley & Berner 2001 Climate forcing (CO2+sun)
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Lec04_AtmComposition_Structure - Units and Prefixes...

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