Lecture24_EAS1600_Fall08

Lecture24_EAS1600_Fall08 - EAS 1600 Introduction to...

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Unformatted text preview: EAS 1600 Introduction to Environmental Sciences ____________________________ Class 24 - Natural Climate Variability ________________________________ . Deep Sea record of 18 O of seawater during the Pleistocene Epoch. Interglacials appear as peaks with smaller values of 18 O; glaciations appear as valleys. irst, A Review: ow do we figure out what he climate was like in the ast? wo basic methods: Geologic/stratigraphy Isotopes (e.g., 16 O/ 18 O) ere is a record of climate for the last two hundred million ears During the Pleistocene glacial period we find shorter term fluctuations haracterized by glacial advances and retreats on a ~100,000 year cycle What might cause these? The much warmer temperatures before this period are due to factors uch as the carbon cycle (long term). Estimate of surface temperature for the last 800,000 years, inferred from measurements of 16 O to 18 O in fossil plankton that settled to the sea floor. Shown are changes in temperature in C from the modern value. Based on data from J. Imbrie, J. D. Hays, D.G. Martinson, A. McIntyre, A. C. Mix, J. J. Morley, N. G. Pisias, W. L. Prell, and N. J. Shackleton, in A. Berger, J. Imbrie, J. Hays, G. Kukla, and B. Saltzman, eds., Milankovitch and Climate, Dordrecht, Reidel, pp 269-305, 1984. http://gcrio.ciesin.org/CONSEQUENCES/winter96/geoclimate.html he Transition From Pleistocene to Present Interglacial...
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Lecture24_EAS1600_Fall08 - EAS 1600 Introduction to...

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