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Terrestrial Heat Flow Patrick Loury and Alex Turner

Terrestrial Heat Flow Patrick Loury and Alex Turner. Map of preferred global heat flux ( mW m -2 ) Davies and Davies, 2010. Heat Loss from the Oceans. Stein et al., 1994. Pollack et al., 1993. Calculated Heat Loss from Oceanic Crust.

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Terrestrial Heat Flow Patrick Loury and Alex Turner

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  1. Terrestrial Heat FlowPatrick Loury and Alex Turner Map of preferred global heat flux (mW m-2) Davies and Davies, 2010

  2. Heat Loss from the Oceans Stein et al., 1994 Pollack et al., 1993

  3. Calculated Heat Loss from Oceanic Crust • Radius of the Earth = • 6,378,100 m • Surface Area = 4= • 4 (3.14) (6,378,100 m²) = • 5.112E14 m² • Oceanic Crust accounts for • ~60% of the Earth’s surface • (5.112E14 m²)(.6) = 3.067E14 m² • Mean heat flow from oceanic terrains (as calculated from Pollack at al., 1993) = • 101 ± 2.2 mW m-2 • Total Heat loss contribution from oceanic crust: (3.067E14 m²) x (101 ± 2.2 mW m-2) = 3.098E16 mW = ~31 TW

  4. Heat Loss from the Continents • Controlling Factors: • Surface area of the material • Age of the last thermo-tectonic event • Chemical composition • Heat flow measurements* • High: Quaternary units (mean: 82.0 mWm-2) • Low: Cambrian Units (mean: 50.5 mWm-2) • Average Effective Heat Flow for Continental Crust: 66.3 mWm-2 • Calculated Heat Loss from Continental Crust: • Assuming continental crust accounts for ~40% of Earth’s total surface Area: • Continental Heat Loss = (66.3 mWm-2)(0.4 x (5.112 x 1014m)) = 13.5 TW *(Davies and Davies, 2010)

  5. Global Heat Loss • Estimates of Global Heat Loss • Davies and Davies (2010): 46.7 ± 2.0 TW • Pollack, et al. (1993): 44.2 TW • This model: 44.5 TW • Oceanic Contribution: ~70% • Continental Contribution: ~30% • Potential Error Sources: • Limited available areas for heat flow measurements • Calculation of effective heat flow values • Areas of abnormally high or low heat flow • Surface Area Assumptions: • CC/OC proportion • Spherical earth

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