论文标题
海洋循环在驱动半球对称性破裂中的作用
The role of ocean circulation in driving hemispheric symmetry breaking of the ice shell of Enceladus
论文作者
论文摘要
地甲基的冰壳在其半球之间表现出强烈的不对称性，尽管其轨道构型几乎完全对称，但所有已知的间歇泉都集中在南极。通过探索跨海洋盐度和核心/壳加热分区的海洋循环，我们研究了冰山相互作用在半球对称性破裂中的作用。我们发现：（i）当冰壳是主要的热源时，跨赤道海洋热传输增强了不对称性，反之亦然，（ii）海洋热传输的幅度与全球热量产生相当，从而显着影响冰壳的进化和平衡状态，而（iii）在熔化和海洋循环之间可能存在更多的平衡状态。
The ice shell of Enceladus exhibits strong asymmetry between its hemispheres, with all known geysers concentrated over the south pole, even though its orbital configuration is almost perfectly symmetric. By exploring ocean circulation across a range of ocean salinities and core/shell heating partitions, we study the role of ice-ocean interaction in hemispheric symmetry breaking. We find that: (i) asymmetry is enhanced by cross-equatorial ocean heat transport when the ice shell is the major heat source and vice versa, (ii) the magnitude of ocean heat transport is comparable to the global heat production, significantly affecting the ice shell evolution and equilibrium state and (iii) more than one equilibrium state can exist due to a positive feedback between melting and ocean circulation.
