GSC 110 Lecture Notes - Lecture 30: Snowball Earth, Deep Time, Water Vapor
2 Jan 2020
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Lecture 30: climate & sea level change i. Ice cores & ocean sediments used for temp. There are 5 confirmed glacial events: red lines are modern temp & precipitation, big period of time that was really warm, dry, no glacial events, precipitation generally (but not always) follows inverse of warm/dry. General long-term climate trends: since formation of earth, global climate has generally cooled, there are several intervals where earth"s climate was warmer than today, during mesozoic. & early cenozoic: there are several instances where earth"s climate was cooler than today, during. Glaciation in past 500 million years: concept of glacial age with widespread effects was first proposed in 1837 by louis. Pleistocene glaciations (last 2. 6 my: studies of deep-sea sediments showed that during last 800k years, length of each glacial- interglacial cycle averaged ~100k years. The last glacial period (30k years: about 30k years ago, late in pleistocene epoch, an extensive ice shet that was over eastern.
