论文标题
动态或间歇泉和示踪剂运输在Ecceladus的南极
Dynamics or Geysers and tracer transport over the south pole of Enceladus
论文作者
论文摘要
在土生土生的南极，是土星的冰冷月亮，间歇泉以条纹图案将水驱逐到太空中，这使得土卫成为寻找外星生命的最吸引人的目的地之一。我们探索与间歇泉相关的海洋动力学和示踪剂/热传输，这是海洋假定的盐度以及各种核心壳热分区和底部加热模式的函数。我们发现，即使加热集中在南极下方海底的狭窄带中，由于斜压不稳定性，温暖的液体也很快与周围环境混合在一起。冰下面的变暖信号是扩散的，不足以防止间歇泉冻结。取而代之的是，如果假定加热是间歇泉的本地化，则从冰中的潮汐消散中散发出来，则可以维持间歇泉。在这种情况下，冰下面的上海变得稳定地分层，因此是垂直通信的障碍，从而导致了从核心到数百年的冰壳的过境时标。
Over the south pole of Enceladus, an icy moon of Saturn, geysers eject water into space in a striped pattern, making Enceladus one of the most attractive destinations in the search for extraterrestrial life. We explore the ocean dynamics and tracer/heat transport associated with geysers as a function of the assumed salinity of the ocean and various core-shell heat partitions and bottom heating patterns. We find that, even if heating is concentrated into a narrow band on the seafloor directly beneath the south pole, the warm fluid becomes quickly mixed with its surroundings due to baroclinic instability. The warming signal beneath the ice is diffuse and insufficient to prevent the geyser from freezing over. Instead, if heating is assumed to be local to the geyser, emanating from tidal dissipation in the ice itself, the geyser can be sustained. In this case, the upper ocean beneath the ice becomes stably stratified and thus a barrier to vertical communication, leading to transit timescales from the core to the ice shell of hundreds of years.
