climate change theory. c limate change ecology main points: 1.climate has never been stable....
TRANSCRIPT
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Climate Change Theory
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Climate Change Ecology
Main points:
1. Climate has never been stable.
2. Climate dynamics impact ecosystems
3. The climate is changing rapidly now.
4. Climate change has substantial implications
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Delcourt and Delcourt 1987
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Delcourt and Delcourt 1987
408 m. land plants
100 m flowering plants
6 m earliest “humans”
Tim Tebow press conference
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Delcourt and Delcourt 1987
THE HOLOCENE (11,000-now)
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Climate Change Ecology
Main points:
1. Climate has never been stable.
• Enormous variability over the long-term
2. Climate dynamics impact ecosystems
• Species respond to climate dynamics
3. The climate is changing rapidly now.
4. Climate change has substantial implications
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Margaret Davis...
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SCIENCE !
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Pollen (SEM)
Acer rubrum Juniperus sp. Ambrosia trifida
http://www.geo.arizona.edu/palynology
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Margaret Davis: Roger’s Lake Ecology (50:409-422), 1969
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http://www.geo.brown.edu/georesearch/esh/QE/Research/VegDynam/VegAnima/Viewer32/WebViewer.html
Pollen Viewer
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Climate Change Ecology
Main points:
1. Climate has never been stable.
• Enormous variability over the long-term
2. Climate dynamics impact ecosystems
• Species respond to climate dynamics
3. The climate is changing rapidly now.
4. Climate change has substantial implications
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Longer term temps?
http://www.realclimate.org/http://www.ipcc.ch/
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Griffith Woods, KY
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http://www.realclimate.org/
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Potential influences on climate:
1) Sunspot activity
2) Volcanoes
3) Ocean current changes
4) Earth’s wobble
5) Atmosphere (greenhouse effect)
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Sunspots!
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Sunspots!
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Sunspots!
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No evidence of more volcanos
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Sensitivity to Orbital Parameters
IPCC AR4 2007Milankovitch Theory
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A CO2 driver of Climate Change….
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The Greenhouse Effect is fundamental to our understanding of how Earth works:
http://earthguide.ucsd.edu/earthguide/diagrams/greenhouse/
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Keeling Curve: Measured on Mauna Loa
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On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground Svante Arrhenius The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Series 5, Volume 41, April 1896, pages 237-276.
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Early Climate Model
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http://earthobservatory.nasa.gov/Features/Paleoclimatology_IceCores/
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today
Carbon Dioxide Concentration
0
100
200
300
400
500
600
700
800
900
0100000200000300000400000
Age (years before present)
CO
2 (p
pmv)
Homo sapiens sapiens
CO2 today
CO2 range in 2100
Petit et al, Nature v.399 (6735), pp. 429-436. (1999)
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http://climate.nasa.gov/
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Climate Change Ecology
Main points:
1. Climate has never been stable.
• Enormous variability over the long-term
2. Climate dynamics impact ecosystems
• Species respond to climate dynamics
3. The climate is changing rapidly now.
4. Climate change has substantial implications
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Climate Change, Theory