Ice-Age Climate - Ice Age, 11,700 years ago Cenozoic...

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Isotopic Fractionation -ratio of heavy and light isotopes in water changes through evaporation and precipitation 3 types of oxygen isotopes – 16O, 17O, 18O During glacial periods, seawater will have a high 18O, because 16O has been preferentially stored in ice sheets
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Biological Fractionation organisms prefer the heavy isotope (18O) temperature dependent, Low levels of marine 18O in shells indicate warmer temperatures, less ice High values indicate colder temps, more ice
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Ice Age Patterns glacial-interglacial cycles show past ice ages Younger Dryas – most recent significant
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Unformatted text preview: Ice Age, 11,700 years ago Cenozoic Cooling Earth had been cooling for the past 55 million years due to carbon dioxide levels decreasing Pleistocene Glaciation About 12C of cooling Causes of Glacial Cycles Obliquity Precession Eccentricity Milankovitch Theory Ice Age Soon? Nope. We are currently living in the most recent interglacial period that started 11,700 years ago the Holocene There wont be another ice age for at least 30,000 years Low eccentricity Minimized precession (less cold summers) High greenhouse gases...
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This note was uploaded on 01/25/2012 for the course ENVIRON 290 taught by Professor Princen during the Fall '10 term at University of Michigan.

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Ice-Age Climate - Ice Age, 11,700 years ago Cenozoic...

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