ocean circulation在驱动土卫二冰壳半球对称破缺中的作用
The role of ocean circulation in driving hemispheric symmetry breaking of the ice shell of Enceladus
摘要：
土卫二的冰壳在其半球之间表现出强烈的不对称性，所有已知的间歇泉都集中在南极，尽管它的轨道结构几乎是完全对称的。通过探索海洋环流的范围内的海洋盐度和核/壳加热分区，我们研究了冰-海洋相互作用在半球对称性破缺的作用。我们发现：（i）当冰壳是主要热源时，越赤道海洋热输送增强了不对称性，反之亦然;（ii）海洋热输送的幅度与全球产热量相当，对冰壳的演变和平衡态产生重大影响;（iii）由于融化和海洋环流之间的正反馈，可能存在不止一个平衡态。
英文摘要：
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.
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