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Geol 101 Climate Changes

Geol 101 Climate Changes - ← Milankovitch ← We can also...

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Geol 101 Climate  29/11/2007 13:45:00 Global Warming Man made climate changes? o CO2 emissions, CH4 emissions o Coal, Oil, Gas o Rainforest Losses Natural Climate Changes? o Solar Radiation o Earth’s Orbital Variations o Atmosphere and Ocean Circulation o Volcanic Eruptions o Plate Tectonics Even if temperature record is unclear, Atmospheric CO2 and CH4 records are  CLEAR o CO2 and CH4 are called ‘Greenhouse Gases’ Solar Radiation of Earth and Greenhouse Gases Just Right For Life on Earth Venus o HOT!!! 450 degrees c, thick CO2 Mars o COLD! This atmosphere Earth has sustained Life for >3.6 billion years o ~.03% CO2 So if we’re heating the planet What Happens? Glaciers Melt How Much? o Depends on how much the Earth’s Temperature Goes up Remember that polar ice caps are large!
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Computer Models start with Solar Radiation Input
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Unformatted text preview: ← Milankovitch ← We can also look at geological history of past climate change • We are currently in ‘Interglacial; period of ‘The Ice Age’ ← Glaciers form by annual accumulation of Snow that is greater than annual melting • Fig 18.7 ← Glacier Ice from Snow • Fig 18.5 • Glacial ice forms either by the metamorphic recyrstallization of snow or the freezing of meltwater ← Past Glacial Intervals • Today, we are in an Ice Age o (Earth’s Poles have Ice Caps) • Mesozoic – Dinosaurs o No Ice Caps ← During the ‘Pleistoncene’ (the last 2 my) we’ve had multiple Colder and Warmer Periods • Glacial Period – relatively colder, glaciers 29/11/2007 13:45:00 ← 29/11/2007 13:45:00 ←...
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