Numerical and Parameterized Modeling of the Earth's Thermal History: Effects of Heat Producing Elements in the Core

Details Numerical and Parameterized Modeling of the Earth's Thermal History: Effects of Heat Producing Elements in the Core Numerical and Parameterized Modeling of the Earth's Thermal History: Effects of Heat Producing Elements in the Core

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.t31g..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #T31G-06

Other

8110 Continental Tectonics: General (0905), 8124 Earth'S Interior: Composition And State (Old 8105), 8125 Evolution Of The Earth, 8130 Heat Generation And Transport

Scientific paper

Thermal convection in the Earth's mantle regulates the rate at which heat is lost from the Earth's interior. Factors affecting the vigor of that convection, such as the viscosity of the mantle and barriers to convection such as the 660-km endothermic phase transition, as well as the rate of radioactive heat generation within the planet determine the rate at which the Earth is cooling. In this presentation, we will describe a suite of simulations of the Earth's thermal history using both parameterized and numerical (fluid-dynamical) modeling of convection in the Earth's mantle. The core is modeled, in both cases, as a heat reservoir which is used to set the temperature boundary condition at the CMB for the numerical model. We investigate the effects of varying the concentration of heat producing radioactive elements in the core by varying the degree of internal heating in this region. We find that the inclusion of modest amounts of heat producing elements in the core results in simulations that fit modern constraints on temperature in the mantle as well as surface heat flow while geochemically derived mantle radioactive abundances of heat producing elements are used.

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