EESA09H3 Lecture Notes - China Steel, Weather Vane, Evaporation
12 Aug 2014
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Document Summary
Mythological and cultural winds: aeolus greek god of wind, feng po po chinese goddess of wind, haya-ji -japanese god of wind, whirlwind, nilch"i navajo holy wind. History of wind: atmosphere has existed for 4. 6 billion years; composition of atmosphere not constant; variation occurred due to 3 main controls: geological, biological and anthropogenic. Geologic control: early atmosphere due to volcanic emissions, co2 and ch4. 3. 8 billion years ago, life appeared anaerobic (not needing oxygen); age of. Bacteria : after 2. 3 billion years of ch4 and co2, abrupt change in atmospheric conditions. Life modifies the environment to best suit itself : atmospheric constituents have been controlled by life to optimize conditions for life. 21% oxygen is optimum for aerobic life: why switch from anaerobic to aerobic, early sun produced 30% less energy, since then solar output has been increasing, high levels of ch4 and co2 had green house effect.
