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Deglacial Climate Change

Deglacial Climate Change. Radiocarbon dates showing the retreat of the N. American ice sheet. Coral data provided data on the rate of sea level change. Proxy records provide evidence for a cold episode (Younger Dryas) that interrupted the deglacial process. .

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Deglacial Climate Change

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  1. Deglacial Climate Change

  2. Radiocarbon dates showing the retreat of the N. American ice sheet

  3. Coral data provided data on the rate of sea level change

  4. Proxy records provide evidence for a cold episode (Younger Dryas) that interrupted the deglacial process.

  5. The Greenland ice cores show rapid (<100 yrs) changes in ice accumulation and dust.

  6. Routes of meltwater flow

  7. Deglaciation flooding of coastlines

  8. Tropical monsoons were stronger in the northern hemisphere 9,000 yrs ago

  9. Proxy records also show tropical monsoon maximum 9,000 yrs ago.

  10. Decreased summer insolation in the northern tropics has produced weaker tropical monsoons.

  11. Decreased summer insolation at high northern latitudes during the last 6,000 yrs coincides with cooler temperatures.

  12. Humans and Paleoclimate

  13. The spread of agriculture

  14. Quelccaya ice cap in Peru

  15. The Little Ice Age could have resulted from orbital-scale cooling or from a millennial-scale oscillation.

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