Solar Physics - Mechanically Degrading ...1) Erosion by...

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Earth 2 Tuesday, February 23rd, 1999 Announcements: Lecture notes: Faint Early Sun Paradox Solar Physics --sun was .7-.8 of what it is today (during the Archean Time Pd.) Climate Models --Earth should be frozen Geologists --say there is life and running water. ..therefore the composition of greenhouse gases was higher, CO2 was stable in the atmosphere, and volcano input which puts CO2 into the atmosphere creating CaCO3 (600x's the amount needed) Lessons Even with reduced sun (.75 solar output), the planet still has life. ..implies remarkable stability Greenhouse Effect. ..explains the CO2 in the atmosphere Energy Equation Balance. ..used to determine factors affecting Archean Time Pd Problem: Sun's output is increasing. If CO2 is high, why didn't the earth explode? Input : Volcano Ouput : Rockweathering
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Unformatted text preview: Mechanically Degrading ...1) Erosion by water 2) Cracked by ice Chemically Degrading ...1) Making surface/soil acidic & it eventually erodes away @ rock Feedback When igneous rock is chemically weathered, CO2 is consumed When limestone is chemically weathered, there is no net change The product of weathering igneous rock is limestone and quartz Soil Warm, wet soil --> INCREASED chemical weathering, which removes CO2 Cold, dry soil --> DECREASED chemical weathering, slow CO2 removal Lessons Potent Negative Feedback (Climate --> Rock Weathering --> CO2) Remarkable Stability in the LONG TERM Takes billions of years If you kick the earth hard, it recovers CO2 is a major factor in the earth's stability...
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This note was uploaded on 02/21/2008 for the course EARTH 002 taught by Professor Eigenbrode during the Spring '99 term at Pennsylvania State University, University Park.

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Solar Physics - Mechanically Degrading ...1) Erosion by...

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