11_paleogene - 1.8 Ma 5.3 Ma Paleogene Climate Neogene 23.8...

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Paleogene Climate 1.8 Ma 23.8 Ma 33.6 Ma 65 Ma 55 Ma 5.3 Ma Neogene – clearly icehouse Late Cretaceous- clearly greenhouse Paleogene – “doubthouse” (Miller)
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Paleogene Climate Zachos et al., 2007 1. Early Eocene Climatic optimum 2. Paleocene/ Eocene Thermal Maximum (PETM) - hyperthermals 2a. Mid-Eocene climatic optimum (MECO) 3. Eocene/Oligocene- Oi1 1 2a 2 3
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Early Eocene Climatic Optimum Geologic Evidence for warmth Vegetation (early Eocene) Swamp cypress on Ellsmere Island Tropical rainforests in Pacific NW and Europe Palm trees in Alaska Fauna Appearance of modern mammal orders (small) Tropical planktonic foram assemblages displaced to 45°N Alligators on Ellsmere Island (78°N) Lithology Kaolinites around AA Laterites up to 45° N
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5 - 10 ° 0-5 ° Surface values adjusted for modern salinity variations with latitude Paleogene Sea surface Gradients Zachos et al., 1994, Paleoceanography
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Paleogene Climate 13 m long Titanoboa from Columbia MAT = 30 – 34C New estimate of temperature gradient ~ modern (Paleocene) Previous Eocene estimates ~ ½ modern gradient in Eocene
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Tropical Temperatures Why tropical temperatures are important 30N-30S = ½ of earth’s surface area- big role in global MAT Used to define GH sensitivity Dominate biodiversity (safe havens for fauna and flora) Key to gradients that drive atmospheric and ocean circulation
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Paleogene Climate Modeled Late Paleocene average surface temperatures 2240 ppmv CO2 Huber, Nature, 2009
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Paleogene CO 2 5x CO 2 Boron- Pearson and Palmer, 2000 Alkenone- Pagani et al., 1999 Pagani et al., 2005 3x CO 2 Green = Pagani 2005- alk Blue = Pearson and Palmer, 2009- δ 11 B Paleogene
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11_paleogene - 1.8 Ma 5.3 Ma Paleogene Climate Neogene 23.8...

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