EESA01H3 Lecture Notes - Lecture 9: Deuterium, Sea Ice, Dendrochronology
29 Dec 2019
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Document Summary
Increase from 280 ppm in 1700"s to >400 ppm today. Increased temperatures result in increased evaporation, which increases water vapour (ghg), which increases temperature . White, black (soot), or haze : possible negative feedbacks: Increased temperatures result in increased evaporation, which increases cloud cover, which decreases temperature. Increased temperatures and wetter conditions promote soil formation, sequestering more carbon. Milankovitch cycles: these cycles do not at all account for the climate change we are currently experiencing! So are we responsible for this: rate of change (temperature and co2) is absolutely unprecedented in the history of earth, very clear that the increase in greenhouse gases is largely due to human activities (combustion of fossil. Recent climate changes have had widespread impacts on the human and natural systems. Future: climate modeling: coupled general circulation models (gcms, coupling is between climate influences of atmosphere and oceans, combine what we know, including feedbacks, and run different scenarios related to past and future co2 concentration.
