UW ATMS 211 - Study Notes (102 pages)

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Study Notes



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Study Notes

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Lecture Notes


Pages:
102
School:
University of Washington
Course:
Atms 211 - Climate and Climate Change

Unformatted text preview:

Announcements The Ethics and Climate Change Conference was really interesting Department social tomorrow afternoon http depts washington edu ponvins ecc program html see web page http www atmos washington edu 2007Q2 211 No extra credit seminars this week Extra credit problem may still be handed in by Wednesday Exam handed back tomorrow Poster list updated by tomorrow Read Chapter 14 Pleistocene Glaciation Ice Ages Silicate Weathering Thermostat Key Points 1 Weathering goes faster with higher CO2 2 Higher CO2 leads to warmer climate and more freshwater runoff both increase rate of weathering 3 Colder climates less freshwater runoff less weathering atmospheric CO2 builds up from volcanic degassing Silicate Weathering Feedback Negative Feedback Stabilizing Climate Initial Forcing Silicate Weathering Rate CO2 Temperature Precipitation Climate Forcings Solar activity Faint early sun Snowball earth Earth sun position Ice ages Aerosol Volcanism Asteroid impacts Greenhouse warming Summary of snowball earth Climate models and our simple feedback analysis suggest that there is an instability in our climate system that would produce an ice covered planet snowball What could trigger the instability Reduction in greenhouse gas concentrations especially coupled with a fainter sun about 6 in Neoproterozoic Possible trigger is not clear have to reduce CO2 levels and CH4 levels Continents all clustered at equator more weathering Source of CH4 exhausted and CH4 removed by photolysis More summary Ice formation increases from poles cutting off biologic activity in ocean changes 13C ratio Planet freezes over life survives but barely Volcanism continues CO2 gradually builds up Eventually get enough large enough greenhouse effect to begin melting ice Positive feedback rapid melting of snowball Very high CO2 atmosphere would promote weathering producing lots of carbonate rocks This would draw down CO2 producing some sort of climate equilibrium More summary Wild explosion of life in this



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