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Modeling Cenozoic Cooling

Modeling Cenozoic Cooling. ERTH 500 Final Project Your Name(s) 5/23/16. Himalayan Rock Budget: Tectonic Forcing, Erosion, and Mountain Height. Long-Term Inorganic Carbon Budget: Atmospheric Carbon, Weathering, and Global Mean Surface Temp and Precipitation. Himalayan Precipitation Rate.

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Modeling Cenozoic Cooling

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  1. Modeling Cenozoic Cooling ERTH 500 Final Project Your Name(s) 5/23/16

  2. Himalayan Rock Budget: Tectonic Forcing, Erosion, and Mountain Height

  3. Long-Term Inorganic Carbon Budget: Atmospheric Carbon, Weathering, and Global Mean Surface Temp and Precipitation

  4. Himalayan Precipitation Rate

  5. Default Model Configuration • Run Specs • Model runs for 60 million years • Time step is 5,000 years • Takes 1 minute, 45 seconds to run on 2015 MacBook Pro laptop • Tectonic Forcing • No collision for 10 million years (10 Myrs) • Allows model to approach equilibrium in pre-collision environment • India collides with Asia 50 Myrs ago • Initial rate = 3 cm/year • Declines steadily to 1.5 cm/year over next 10 Myrs • Stays steady at 1.5 cm/year for last 40 Myrs • Sea-floor spreading (and so volcanic outgassing) stays constant the whole time

  6. Default Model Configuration (cont’d) • Atmospheric Carbon and Surface Temperature • Initial mass of atmospheric carbon = 1068 Gtons • Approximately model’s steady-state value, pre-collision • Perhaps 60% of actual amount 50 Myrs ago? • Pre-collision weathering rate too high? • Initial temperature: 289.5 K (26.4°C) • Much colder (9 - 10°C?) than Earth 50 Myrs ago • Reflects under-calculation of atmospheric carbon

  7. Simulation: Default ConfigurationTectonic Forcing, Erosion, and Mountain Height

  8. Simulation: Default ConfigurationAtmospheric Carbon, Weathering, and Global Mean Surface Temp

  9. Simulation: Default ConfigurationHimalayan Precipitation Rate

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