ERSC 1F90 Lecture Notes - Lecture 3: Scanning Electron Microscope, Sea Level Rise, Polar Amplification
18 Feb 2016
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Document Summary
Transition in rocks fill of diverse life to devoid (world-wide) Multiple concerns: warming, sea level rise, acidification. Global change in seawater temperature ~1 degrees celsius (0. 67/100 years) ipcc. Much of the radiation is absorbed by the earth"s atmosphere. Atmosphere essential, provides a: shield against hazardous radiation reacts with uv radiation, blanket for the earth. Converts light energy into heat energy (long wavelength) Causes build-up of heat energy (greenhouse effect, global warming) Sources of greenhouse gases paddies, burning of forests, landfills, mines: volcanoes, mantle degassing, wetlands, lakes, cars, cement production, factories, enteric fermentation, rice. Australian research- stomach of a kangaroo special bacteria; thus no methane. Temperature limits imposed by carbon units: determine surface t (heat budget) without an atmosphere. Result of computations: earth without an atmosphere maat 255k or ~18 degrees celsius, from measurements: a) direct ~15 degrees celcius, indirect. Greenhouse gas warming effect = 33 degrees celcius. Heat budget determination: r-adiation equilibrium equation, e- nergy conservation law equation, d-irect.
