论文标题
对依赖温度的冰的新见解及其对冰壳对流的冰冷海洋世界的影响
New insights into temperature-dependent ice properties and their effect on ice shell convection for icy ocean worlds
论文作者
论文摘要
冰壳动力学是对冰冷海洋世界的可居住性的重要控制。在这里，我们提出了一项系统的研究，该研究评估了依赖温度的材料特性对这些动力学的影响。我们回顾了已发表的ICE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下限。我们提出了一个新的导热率模型，该模型跨越了与海洋世界的冰壳相关的温度范围。这会增加表面附近低温下的热导率约五分之一。我们表明，在冷表面附近的热导率的增加可以稳定欧罗巴的冰壳。此外，我们表明，包括温度依赖的特异性热容量会降低导电盖中存储的能量，从而将冰壳对热扰动的响应时间尺度降低了大约三分之一。这可能有助于解释表面特征，例如混乱的地形，这些特征需要大量的能量在近地表冰中增加。
Ice shell dynamics are an important 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 can stabilizes the ice shell of Europa. Furthermore, we show that including temperature dependent specific heat capacity decreases the energy stored in the conductive lid which reduces the response timescale of the ice shell to thermal perturbations by approximately a third. This may help to explain surface features such as chaotic terrains that require large additions of energy to the near-surface ice.
