Topic_7____Climate_Change_II

Topic_7____Climate_Change_II - Topic 7: Climate Change...

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Unformatted text preview: Topic 7: Climate Change through Time II: Greenhouse/ Icehouse to Milankovitch Hypothesis Part 2 Earths orbital parameters and climate change Pacemaker of the Ice Ages 1. How was the Pleistocene Earth, 18,000 years ago, different than todays Earth? Ice covered ~30% of modern land area (about half of North America) Sea level was 120 meters lower than today! View animations of ice and sea level changes since the last Ice Age. You will need QuickTime (for this freeware, click here ) to view these animations for North America and the Bering Strait . These animations are from "The Ice Age" CD by Kirkby, Morin & Slawinski (1999) of the University of Minnesota. North Atlantic ocean frozen; to south, armadas of drifting and melting icebergs; Gulf Stream flowed from Florida to Africa instead of Europe Tundra and similar habitats expanded; tropical rainforests shrunk (more information here ) Windy planet owing to higher atmospheric pressure gradients Vegetation shifts with time since the last Ice Age: QuickTime animation of pine pollen 2. The Milankovitch Hypothesis (another link ) Earths...
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Topic_7____Climate_Change_II - Topic 7: Climate Change...

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