BIO220H1 Lecture Notes - Lecture 10: Numerical Weather Prediction, Lewis Fry Richardson, Svante Arrhenius
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BIO220H1 Full Course Notes
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Document Summary
Climate changed a lot on earth: had shifts in biota. Entered 5th major ice age 2. 5 mya ago. Since then, cycling between more and less ice. Picture shows ice-free earth 55mya: sea levels high. An ice age has alternating glacial and interglacial periods. Over last ice age have alternating period of glacial and interglacial periods: glacial periods: overall ice and glaciers expanding, interglacial periods: ice and glaciers retreating. See estimates of air temperature taken from vostock and epica ice core and from sediment cores. As ice volume expands see real changes in temperature. For bottom graph (red), ice volume is low at top, and high in bottom: spike = decrease in ice volume = increasing temp. Should enter glacial period soon: exit current interglacial in 10-50 thousand years. But next 100 years is what people are looking at: what human activity has done that has altered what should happen.
