Lecture 20 - Climate Change part 1

Lecture 20 - Climate Change part 1 - Global Temperature...

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CHAPTER 19 GLOBAL CLIMATE CHANGE
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Uses of the geologic record E.g., carbon dioxide concentration in glacial ice Real-time monitoring: Good for testing models and predictions from prehistoric record Mathematical models General circulation models (GCMs) Global climate models (GCMs) Tools for Studying Global Change
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Tools for Studying Global Change
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http://en.wikipedia.org/wiki/Image:Phanerozoic_Climate_Change.png, Veizer et al. (1999) Global Temperature Change
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Figure 19.11 Global Temperature Change
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http://en.wikipedia.org/wiki/Image:5Myr_Climate_Change.png, Lisiecki and Raymo (2005) Last few million years: Earth has been in a cold stage (temperatures below average, on time scale of millions of years), with glacial periods and brief warm interglacials Global Temperature Change
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http://en.wikipedia.org/wiki/Image:5Myr_Climate_Change.png, Lisiecki and Raymo (2005) 100,000 year cycle: Glacial periods dominate (70-100,000 years) with brief warm interglacials (10-20,000 years) Global Temperature Change
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Figure 19.11
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Unformatted text preview: Global Temperature Change Figure 19.11 Global Temperature Change Figure 19.11 Global Temperature Change Figure 19.11 Global Temperature Change Global Warming in Last Few Centuries http://upload.wikimedia.org/wikipedia/commons/c/c1/2000_Year_Temperature_Comparison.png Longer-term view of climate change: eventually, Earth must be heading toward another glacial period Global Temperature Change • The Pleistocene Ice Age: ~2 million years ago, peaked at 18,000 years ago • Numerous changes in Earth’s mean annual temperature since then • Warming trend over the last 150 years, especially since 1940s with the warmest since 1990s • Mean temperature increased about .8 o C (1.36 o F) in the past 100 years Global Temperature Change Figure 19.10 Carbon Dioxide in the Atmosphere http://upload.wikimedia.org/wikipedia/commons/8/88/Mauna_Loa_Carbon_Dioxide.png Numerous sources of CO 2 additions to atmosphere: Human, volcanic, methane hydrates Carbon Dioxide in the Atmosphere...
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This note was uploaded on 02/02/2010 for the course GEO 101 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lecture 20 - Climate Change part 1 - Global Temperature...

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