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.

冰壳动力学是控制冰冷海洋世界宜居性的关键控制因素。在这里，我们提出了一项系统研究，评估温度依赖性材料特性对这些动力学的影响。我们回顾了已发布的冰的热导率数据，该数据表明，行星科学中最常用的电导率模型代表了一个下限。我们提出了一种新的导热系数模型，该模型涵盖了与海洋世界的冰壳相关的温度范围。这使表面附近的低温下的热导率增加了大约五分之一。我们表明，在寒冷的表面附近，这种导热系数的增加有利于欧罗巴冰壳中的对流而不是对流。此外，我们发现，包括与温度有关的比热容会降低存储在导电盖中的能量。因此，冰壳响应热扰动的时间尺度减少了大约三分之一。对热扰动更敏感的冰壳可能有助于解释诸如混沌地形之类的表面特征，这些特征需要向近地表的冰增加大量能量。