GEOG 4014 Study Guide - Pre-Illinoian, Eugenius Warming, Medieval Warm Period

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18 Jun 2014
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There is no evidence that the average global temperature was ever <32(cid:176) f or > a few tens of degrees above today"s average temperatures. Billions of years ago, solar output was kept temperatures warm. 25% less than now, but high co2 levels. A sequence of low temperatures and glaciation (ice ages -- long), then warmer ice-free conditions ( 100-200 million years long). Aftonian: only about 9(cid:176) f separate a glacial from an interglacial. Bottom line: we are now in an interglacial period of an ice age -- an unusual time in earth history. This ice age began at least 2 mya. Sea level: during ice ages, sea level falls. Why: continental shelves are exposed during these times, if ice caps melt, then sea level would rise, and coastal areas would be flooded, however, many places that were covered by ice are now rising relative to sea level.

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