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Climate Change in the Geologic Record

Climate Change in the Geologic Record. Miriam S. Andres, Angela Hessler, Tim McHargue Carbonate Research & Development Team ETC-Chevron, San Ramon December 2009. Taken from Ruddiman : Earth’s Climate: Past and Future. Temperature in the Geologic Record. www.wikipedia.org.

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Climate Change in the Geologic Record

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  1. Climate Change in the Geologic Record Miriam S. Andres, Angela Hessler, Tim McHargue Carbonate Research & Development Team ETC-Chevron, San Ramon December 2009

  2. Taken from Ruddiman: Earth’s Climate: Past and Future

  3. Temperature in the Geologic Record www.wikipedia.org

  4. Temperature in the Geologic Record – A Matter of Time Scales Cretaceous Supergreenhouse Anthropocene PETM Younger Dryas www.wikipedia.org

  5. The Cretaceous – Super Greenhouse Climate 2000-1000 ppm; 8x pre-industrial levels 2011 (389 pp) High sea level; abundant inundated shallow shelf areas. one-third of Earth's present land area was submerged Taken from Ruddiman: Earth’s Climate: Past and Future

  6. The Cretaceous – Super Greenhouse Climate Why did it not get warmer and warmer? Taken from Ruddiman: Earth’s Climate: Past and Future

  7. Temperature in the Geologic Record – A Matter of Time Scales Cretaceous Supergreenhouse PETM Anthropocene Younger Dryas www.wikipedia.org

  8. Paleocene-Eocene Thermal Maximum ~56Ma Taken from National Geographic, October 2011

  9. Taken from National Geographic, October 2011

  10. Taken from National Geographic, October 2011

  11. Taken from National Geographic, October 2011

  12. PETM vs. current warming Source: http://www.wunderground.com/climate/PETM

  13. Comparison Source: http://www.wunderground.com/climate/PETM

  14. Temperature in the Geologic Record – A Matter of Time Scales Cretaceous Supergreenhouse Anthropocene PETM Younger Dryas www.wikipedia.org

  15. The End of the Last Glacial Ice retreating but then… Taken from Ruddiman: Earth’s Climate: Past and Future

  16. The Younger Dryas – return to glacial conditions The 90 Minute Hollywood Version

  17. A Lake? Are you serious? Mark Bateman, Sheffield University The prevailing theory holds that the Younger Dryas was caused by a significant reduction or shutdown of the North Atlantic thermohaline circulation in response to a sudden influx of fresh water from Lake Agassiz (size of UK) and deglaciation in North America. But still a lot of uncertainty and contradicting data sets. -> Bolide impact? -> Other outflows?

  18. Whatever the cause – the result impressive: www.earthtimes.org Shakun & Carlson, 2010 • Rate of change: Temperature drop within a human life span (~30yrs) • Global effects: not always cooling, but sometimes drought • Summit of Greenland was ~15°C colder during the Younger Dryas • than today. • In the UK, (fossil beetle) evidence suggests mean annual temperature • dropped to approximately 5°C,and periglacial conditions prevailed in • lowland areas, while icefields and glaciers formed in upland areas.

  19. Temperature in the Geologic Record – A Matter of Time Scales Cretaceous Supergreenhouse PETM Anthropocene Younger Dryas www.wikipedia.org

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