globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116886
论文题名:
New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds
作者: Carnahan E.; Wolfenbarger N.S.; Jordan J.S.; Hesse M.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: convection ; Europa ; heat capacity ; ice ; ice shell ; thermal conductivity
英文关键词: Heat convection ; Ice ; Oceanography ; Shells (structures) ; Specific heat ; Convection ; Energy ; Europa ; Ice properties ; Ice shells ; Shell dynamics ; Systematic study ; Temperature dependent ; Thermal ; Thermal perturbations ; Thermal conductivity ; heat capacity ; ice ; Jupiter ; perturbation ; planetary satellite ; response analysis ; temperature anomaly ; thermal conductivity
英文摘要: Ice shell dynamics are a critical control on the habitability of icy ocean worlds. Here, we present a systematic study evaluating the effect of temperature-dependent material properties on these dynamics. We review the published thermal conductivity data for ice, which demonstrates that the most commonly used conductivity model in planetary science represents a lower bound. We propose a new model for thermal conductivity that spans the temperature range relevant to the ice shells of ocean worlds. This increases the thermal conductivity at low temperatures near the surface by about a fifth. We show that such an increase in thermal conductivity near the cold surface favors conduction over convection in the ice shell of Europa. Furthermore, we find that including temperature dependent specific heat capacity decreases the energy stored in the conductive lid. Thus, the timescale for ice shell response to thermal perturbations is reduced by approximately one third. An ice shell that is more sensitive to thermal perturbations may help to explain surface features such as chaotic terrains which require large additions of energy to the near-surface ice. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165423
Appears in Collections:气候变化与战略

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作者单位: Department of Geological Studies, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX, United States; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, United States

Recommended Citation:
Carnahan E.,Wolfenbarger N.S.,Jordan J.S.,et al. New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds[J]. Earth and Planetary Science Letters,2021-01-01,563
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