ATM OCN 101 Study Guide - Final Guide: Chemical Potential, Thermosphere, Advection
30 Oct 2014
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Pressure the weight of the atmosphere above: force (weight)/area, measured by a barometer think of snowshoes- how they work. Atmospheric composition: big bang- universe was composed of hydrogen (h) & helium (he, earth s original atmosphere: he, h, methane (ch4), ammonia (nh3) Change: earth cooled & water vapor began to form clouds and it rained! Carbon dioxide was gradually soaked up by these reservoirs & atmosphere became rich in n2: 2-3 billion years ago- primitive plants evolved in oceans, plants produced by photosynthesis. Sunlight + 2co2 + 3h2o 2o2 + c2(h2o)3. Sunlight + carbon dioxide + water oxygen + carbohydrate/food: ozone (o3) was produced; regulated by 2 reactions: O3 + uvenergy/light o2 + o. Uses uv to split ozone so ozone protects us from these deadly uv rays. O2 + o o3: ***life responds to oxygen & ozone life colonizes dry land (can now b/c ozone protects it) Oxygen breathing animals can be bigger: current atmosphere composition.
