Coupling numerical models of mantle convection with energy and entropy balance models in the core: Implications for the evolution of the Earth's core and magnetic field

Details Coupling numerical models of mantle convection with energy and entropy balance models in the core: Implications for the evolution of the Earth's core and magnetic field Coupling numerical models of mantle convection with energy and entropy balance models in the core: Implications for the evolution of the Earth's core and magnetic field

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.u52a..02c&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #U52A-02

Physics

1510 Dynamo Theories, 8115 Core Processes (1507), 8125 Evolution Of The Earth, 8130 Heat Generation And Transport, 8147 Planetary Interiors (5430, 5724)

Scientific paper

Recent studies of energy and entropy balances in the core constrain the power requirements for magnetic field generation and the age of the inner core (\textit{e.g.} Buffett, 2002, Labrosse et al., 2001, Labrosse, 2003, Nimmo et al., 2004). These studies suggest that the change of entropy in the core needs to be positive during the entire period the geodynamo operated. The geodynamo efficiency is determined by the redistribution of heat and mass in the core and is ultimately controlled by the rate at which the mantle removes heat from the core. In the previous analyses the heat flow at the core-mantle boundary was either prescribed or determined from parameterized schemes of mantle convection. We couple heat flows predicted by numerical models of mantle convection with energy and entropy balance models to determine the age of the inner core and the available power to drive the dynamo. The entropy and energy balances are studied for various degrees of layering in the mantle and highly temperature dependent mantle rheology. In addition, we explore the consequences different rates of internal heating in the the core and mantle have on the thermal and magnetic evolution of the Earth and its core.

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