What Causes Ice Ages? www.assignmentpoint.com.

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Presentation transcript:

What Causes Ice Ages? www.assignmentpoint.com

What Causes Ice Ages? Within Earth (Endogenic) Carbonate-Silicate Cycle Volcanic Eruptions - Sudden output of CO2 (warming) or particulates (cooling) Mountain Building - Changes in atmospheric circulation Continent-Ocean configuration Outside Earth (Exogenic) Changes in Sun (faint early sun) Variations in Earth Orbit (Milankovitch Cycles) Don't Really Know www.assignmentpoint.com

Are We Headed For Another Ice Age? Heating & Cooling in Historic Times Smoke, Haze, CO2 May Alter Climate Don't Really Know Global warming due to fossil fuels may be catastrophic in many ways, but will probably not much affect these longer-term cycles. We will have run out of fossil fuels long before the duration of a typical interglacial. www.assignmentpoint.com

The Snowball Earth Between 900 and 600 m.y. ago, Earth froze completely (or almost) about four times Global freezing alternated with extremely rapid sea-level rise and global warming Evidence: Glacial deposits on all continents, even at low latitudes Glacial deposits immediately succeeded by thick deposits of carbonate rocks www.assignmentpoint.com

The Snowball Earth Possible reasons: Fainter early sun Biological changes Global ice cover Weathering and erosion shut down Volcanoes continue to erupt CO2 At 10% CO2, abrupt warming begins Go from –50 C to +50 C in 10,000 years? Implications for life? www.assignmentpoint.com