Geol30_08_Lecture_13b

More details on how we know ie the geological evidence

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Unformatted text preview: on HOW we know (i.e., the geological evidence) is provided in the addendum Albedo (~reflectivity) The amount of radiation absorbed depends on type of p yp material it comes into contact with Albedo = % of incoming radiation reflected back into space (~reflectivity) (~reflectivity) average albedo of Earth = 30% Ice high albedo (~90%) Ocean low albedo (~5%); light penetrates into depth Land depends on coverage albedo between ocean and ice levels 6 2/19/2008 The Freeze-Fry: The Freeze FreezeLarge land areas clustered g You'd need some at high latitudes (where glaciers begin) and some at low (to increase reflectivity) The latter would increase albedo overall energy retained by Earth's atmosphere less LongLong-term carbon cycle becomes imbalanced Atmospheric levels of CO2 levels decrease, decrease, as do global temperatures CO2 interchange between ocean (and its photosynthetic inhabitants), air, and land is disrupted The Freeze-Fry: The Freeze, cont. (1) FreezeIce began to expand and descend from the poles The Earth's albedo is further increased, increased, (more ice higher reflectivity) thus reflectivity) accelerating the cooling even more Evaporation decreased (due to cooling of oceans) Water vapor concentration decreased, decreased, weakening the greenhouse effect This accelerated the cooling even more! Runaway ice albedo effects...
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This document was uploaded on 06/04/2008.

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