14_pliocene - Pliocene Climate Pliocene 5.3 1.8 Ma...

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Pliocene Climate Pliocene 5.3 – 1.8 Ma Transition from: Relatively warm climate to cooler Pleistocene Little to no NH glaciers to major ice sheets Three parts: Early warmish Pliocene warmth Climate deterioration
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Pliocene Warmth Warmth ~ 5 – 3 Ma Last time the temperature was > present Warmest of last 7 Ma Often used for understanding future warming: Wide geographic distribution of samples Extant biota More precise stratigraphy (Warning - anthropogenic warming nonequilibrium conditions. Pliocene – closer to equilibrium)
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Pliocene Warmth Mix et al., Leg 138, 1995 Eastern Equatorial Pacific Benthic record Pliocene Warmth Climate Deterioration
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Pliocene Warmth
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Pliocene Warmth Venz and Hodell Modern value Cooler/more ice
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Pliocene Warmth Evidence for warmth: Boreal forests to margins of Arctic Ocean (Matthews and Ovenden, 1990) Northern Atlantic and Pacific SST ~5°C> present (Dowsett and Poore, 1991) Southern Ocean temperatures ~5°C warmer (Ciesielski and Weaver, 1974) Tropical SST slightly warmer than today (depends on location) Global temperature 3°C warmer than today
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Pliocene Warmth Other conditions Arctic seasonally ice free (Cronin et al., 1993) Sea level- wide range (10-20 m higher; 30-35 m higher Krantz, 1991); up to 60 m : Haq et al., 1987) Enhanced THC (Raymo et al., 1996) Antarctic sea ice reduced (Diatoms- Barron, 1996) Modern summer limit ~ Plio winter limit) Antarctica partially deglaciated (? Webb and Harwood, 1991)
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Sea Level Haq et al., 1987 Miller et al., 2005
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14_pliocene - Pliocene Climate Pliocene 5.3 1.8 Ma...

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