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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


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



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


The Cretaceous – Super Greenhouse Climate Scales

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


The Cretaceous – Super Greenhouse Climate Scales

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 Scales

Taken from National Geographic, October 2011





Petm vs current warming
PETM vs. current warming Scales

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


Comparison
Comparison Scales

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 Scales

Ice retreating but then…

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


The younger dryas return to glacial conditions
The Younger ScalesDryas – return to glacial conditions

The 90 Minute Hollywood Version


A Lake? Are you serious? Scales

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?


Whatever the cause – the result impressive: Scales

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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