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Unformatted text preview: ^14C dating i. LGM- 20,000 yrs 5. Deglacial 2 Step a. Summer insulation- 60 degrees N b. Melt water pulses c. During deglaciation, organisms delta 18 values were more negative 6. Mid Deglacial Cooling a. Younger-Dryas event b. Dryas- An artic plant appeared in Europe for the first time c. Occurred in only 3-10 years 7. Melting Glacier a. Melt water to the Gulf of Mexico b. Sudden collapse goes in to North Atlantic → stops deep ocean circulation c. However, have not found path of glacial water to North Atlantic d. Should have affected the whole globe, but no evidence 8. Preglacial Lakes moving north a. Bedrock depressed under glaciers b. Rebounds when glacier melts c. When it rebounds, it moves the glacial lakes north d. Lake Agassie, Great Lakes e. Channeled scablands- huge flood from melting glaciers 9. Over the last century, earths temperature increase by .75 degrees C...
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- Spring '08
- Antarctica, sea level, Glaciology, North Atlantic, melting glacier