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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

Climate Change in the Geologic Record

Miriam S. Andres, Angela Hessler, Tim McHargue

Carbonate Research & Development Team

ETC-Chevron, San Ramon

December 2009

temperature in the geologic record a matter of time scales
Temperature in the Geologic Record – A Matter of Time Scales

Cretaceous Supergreenhouse

Anthropocene

PETM

Younger Dryas

www.wikipedia.org

slide5
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

slide6
The Cretaceous – Super Greenhouse Climate

Why did it not get warmer and warmer?

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

temperature in the geologic record a matter of time scales1
Temperature in the Geologic Record – A Matter of Time Scales

Cretaceous Supergreenhouse

PETM

Anthropocene

Younger Dryas

www.wikipedia.org

paleocene eocene thermal maximum 56ma
Paleocene-Eocene Thermal Maximum ~56Ma

Taken from National Geographic, October 2011

petm vs current warming
PETM vs. current warming

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

comparison
Comparison

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

temperature in the geologic record a matter of time scales2
Temperature in the Geologic Record – A Matter of Time Scales

Cretaceous Supergreenhouse

Anthropocene

PETM

Younger Dryas

www.wikipedia.org

the end of the last glacial
The End of the Last Glacial

Ice retreating but then…

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

slide17
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?

slide18
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.
temperature in the geologic record a matter of time scales3
Temperature in the Geologic Record – A Matter of Time Scales

Cretaceous Supergreenhouse

PETM

Anthropocene

Younger Dryas

www.wikipedia.org

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