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26. Isotope Evidence for Climate Change

The Atmosphere, the Ocean and Environmental Change (GG 140) Isotopes are used to measure past climate properties. Deuterium and oxygen 18 are the most commonly used climate proxies. Lighter isotopes evaporate more readily from the ocean, so water vapor in the atmosphere is isotopically lighter than ocean water. This vapor gets lighter still as it is transported to higher latitudes while losing mass by precipitation. These processes leave an isotopic signal of temperature and continental ice volume in ice cores and deep sea sediment cores. 00:00 - Chapter 1. Stable Isotopes of Water 09:48 - Chapter 2. Isotope Delta Notation 11:41 - Chapter 3. Isotopic Fractionation 18:08 - Chapter 4. Water Isotopes in Ice Cores 31:14 - Chapter 5. Terrestrial and Deep Sea Sediments 33:44 - Chapter 6. Oxygen Isotopes in Ocean Sediment Cores 44:08 - Chapter 7. Milankovitch Theory of Ice Ages Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu This course was recorded in Fall 2011.