DOI: 10.1029/2017JE005497
Scopus记录号: 2-s2.0-85051081271
论文题名: The Influence of Curvature on Convection in a Temperature-Dependent Viscosity Fluid: Implications for the 2-D and 3-D Modeling of Moons
作者: Guerrero J.M. ; Lowman J.P. ; Deschamps F. ; Tackley P.J.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 7 起始页码: 1863
结束页码: 1880
语种: 英语
英文关键词: annulus
; icy satellites
; mantle convection
; moons
; spherical shell
; stagnant lid
英文摘要: Convection in terrestrial bodies occurs within spherical shells described by the ratio, f, of their bounding radii. Previous studies that have modeled convection with a temperature-dependent viscosity noted the strong effect of f on transition to the stagnant-lid regime. Here we analyze stagnant-lid convection in 2-D and 3-D systems with curvatures including relatively small-core shells (f as small as 0.2) as well as in thin shell and plane-layer cases. Several peculiarities of convection in a strongly temperature-dependent viscosity fluid are identified for both high and low curvature systems. We demonstrate that effective Rayleigh numbers may differ by orders of magnitude in systems with different curvatures, when all other parameters are maintained at fixed values. Furthermore, as f is decreased, the nature of stagnant-lid convection in small-core bodies shows a divergence in the temperature and velocity fields found for 2-D annulus and 3-D spherical shell systems. In addition, substantial differences in the behavior of thin shell (f = 0.9) and plane-layer (Cartesian geometry) models occur in both 2-D and 3-D, indicating that the latter (emulating a toroidal topology rather than spherical) may be inappropriate approximations for modeling variable viscosity convection in thin spherical shells. Our findings are especially relevant to understanding and accurately modeling the thermal structure that may exist in bodies characterized by thin shells (e.g., f = 0.9) or relatively small cores, such as shells comprising the Galilean satellites and other moons. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113633
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Toronto, Toronto, ON, Canada; Department of Physical and Environmental Sciences, University of Toronto, Scarborough, Toronto, ON, Canada; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Earth Sciences, ETH-Zurich, Zurich, Switzerland
Recommended Citation:
Guerrero J.M.,Lowman J.P.,Deschamps F.,et al. The Influence of Curvature on Convection in a Temperature-Dependent Viscosity Fluid: Implications for the 2-D and 3-D Modeling of Moons[J]. Journal of Geophysical Research: Planets,2018-01-01,123(7)