气候变化领域集成服务门户(CCPortal): New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds

CCPortal

DOI	10.1016/j.epsl.2021.116886
	New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds
	Carnahan E.; Wolfenbarger N.S.; Jordan J.S.; Hesse M.A.
发表日期	2021
ISSN	0012821X
卷号	563
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203045
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
推荐引用方式 GB/T 7714	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],2021,563.
APA	Carnahan E.,Wolfenbarger N.S.,Jordan J.S.,&Hesse M.A..(2021).New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds.Earth and Planetary Science Letters,563.
MLA	Carnahan E.,et al."New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds".Earth and Planetary Science Letters 563(2021).