Last Glacial Maximum (LGM)

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  Began 2-3 mya  Last glacial period ended 15,000 years ago  Pleistocene epoch  Ice covered 30% of Earth’s land  Indirect effect of Ice Age glaciers:
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Presentation transcript:

Last Glacial Maximum (LGM) Reading is Chapter 12 in Ruddiman 2nd ed

Boundary Conditions Removed figure for copy right reasons. Figure 12-1 from Earth's Climate - Past and Present by William Ruddiman 2008

Boundary Conditions Removed figures for copy right reasons. Figure 12-1 from Earth's Climate - Past and Present by William Ruddiman 2008 Figure 7-2 from Earth's Climate - Past and Present by William Ruddiman 2008 Obliquity – From Analyseries

CLImate MApping and Prediction The project was funded by the NSF Imbrie, Hays, and Shackleton Reconstruct LGM Sediment cores to reconstruct oceanic conditions Vegetative zones Extent of glaciation

In class activity part #1 In groups of four Skim the CLIMAP papers for the assumptions (modern and/or LGM) used in the model-based LGM reconstruction CLIMAP (1976), The surface of the ice-age earth, Science, 191(4232), 1131-1137. CLIMAP (1984), The last interglacial ocean, Quatern. Res., 21(2), 123. Compare between papers

CLIMAP assumptions Assumptions Modern LGM Sea level Land albedo Ice sheets Ice margins Ocean temp Sea Ice Insolation

In class activity part #2 Let’s look at the model results from CLIMAP for the LGM in your web browser, go to http://iridl.ldeo.columbia.edu/SOURCES/.CLIMAP/

Modern vs. LGM Data Set aug SST feb SST elevation glacial_ice relief type exposed_soil soil type vegetation type vegetative water

Temperature in the Tropics Average of the Tropics Modern LGM Aug Feb

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