EESA07H3 Lecture Notes - Vertical Draft, Axial Tilt, Trade Winds

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Composition and structure of the atmosphere: the very early atmosphere probably consisted of gases, mainly hydrogen and helium, which was. Lecture 4: atmosphere-climate system abundant in the solar system: then came the geologic control, under geologic control, a secondary atmosphere was formed: once rocks at surface were sufficiently oxidized, more oxygen could remain free in atmosphere. there was switch from anaerobic to aerobic condition 2. 3 bya. 2. 3 bya solar output increased and earth was becoming too warm, the switch to aerobic life, reduce the greenhouse gases and cooled the planet. now have lower levels of co2 in atmosphere than early earth. o2 stabilizes at 21%, which is optimal for life on earth: then came the anthropogenic control, during carboniferous period (290-360mya) life appears on land. sun"s energy converted to plant material (photosynthesis) converted to coal and oil under geologic pressure, stored for millions of years.

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