Zonal flow formation in the Earth’s core

Takehiro Miyagoshi, Akira Kageyama () and Tetsuya Sato
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Takehiro Miyagoshi: Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
Akira Kageyama: Graduate School of Engineering, Kobe University
Tetsuya Sato: University of Hyogo

Nature, 2010, vol. 463, issue 7282, 793-796

Abstract: Zonal flow in Earth's core As zonal flows are common in turbulent convection regimes, such as in the atmospheres of giant planets and the Earth's oceans, they might also be present in the Earth's outer core, which is thought to be in a turbulent state. Takehiro Miyagoshi and colleagues have investigated numerical simulations of the Earth's geodynamo with lower viscosities than most previous simulations have been able to use, and have identified a new convection regime of core flow that exhibits a dual structure — inner sheet-like radial plumes, surrounded by westward cylindrical zonal flow. Thus convection in the Earth's outer core may therefore resemble that seen in planetary atmospheres and oceans more closely than was expected.

Date: 2010
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DOI: 10.1038/nature08754

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