10. Ice Ages_Glaciers

10. Ice Ages_Glaciers - Climate Change - Past Ice Ages The...

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Unformatted text preview: Climate Change - Past Ice Ages The Pleistocene Ice Age - At least 16 ice advances over the last 2 m.y., with glacial periods every 100,000'years. The last retreat began 10-12,000 yrs ago. We used to recognize only 4 events but studies in the last 10m years using He, C, and O isotopes on ice cores and ocean sediments show dramatic rapid changes in climate. + 10- 10 1m.y. 2 m.y. T ûC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ~16 event s/ 2 m.y. ~ 1 per 100,000 yrs Schematic plot! USC Geol 108 (Anderson) Who Discovered the Ice Age? Louis Agassiz in 1836, from studies of diminishing glaciers in the Swiss Alps. Last 150 Years http://www.globalwarmingart.com/ Global Warming - Today Global T - Past 2000 years Last 450,000 Years http://www.globalwarmingart.com/ Last 5 Million Years The Pleistocene Ice Age Past 65 Million Years Warm Very Warm Cold Today Past 65 Million Years Initially warm followed by cooling! The Earth was much warmer during the Age of Dinosaurs (65-250 m.y.) during the Mesozoic Era, but began to cool 50 m.y ago. Warmth - high rates of sea floor spreading, volcanism, volcanic CO...
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This note was uploaded on 02/06/2011 for the course GEOL 108Lg at USC.

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10. Ice Ages_Glaciers - Climate Change - Past Ice Ages The...

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