LIFESCI 2H03 Lecture Notes - Hydrogen Sulfide, Hadean, The Faint
11 Jun 2013
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Document Summary
Hadean: time from the formation of the solar system and early accretion of the planet. Archaean: time of the beginning of life. The prebiotic hadean environment from creation of solar system: 4. 6 gyr. Earth received finite amounts of water vapour and carbon: determined during these early stages. Co2 on earth: tied up in carbonate rocks. Water: liquid and mainly found in oceans, 90%, venus closer to sun has a more powerful greenhouse affect due to co2, too hot for water to remain liquid. Early earth lot of volcanic activity influenced by gases impact with meteorites causing to lose gases to surroundings. Earth"s ocean would evaporate many times and condense again. Early atmosphere overall reducing environment: hydrogen(h2), methane (ch4), ammonia (nh4), water, nitrogen (n2), no release of oxygen due to photosynthesis. Small amounts of carbon dioxide/monoxide and hydrogen sulfide today"s atmosphere overall oxidizing environment: nitrogen (n2), oxygen (o2), carbon dioxide (co2), water (h2o)
