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arXiv 2007.08958physics.flu-dynastro-ph.EPphysics.comp-ph
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深层旋转对流产生土星上的极六边形

Deep rotating convection generates the polar hexagon on Saturn

Rakesh Kumar Yadav, Jeremy Bloxham

备注：
11 pages, 4 main and 5 supplementary figures, 1 animation, 42 references
发表信息：
PNAS June 23, 2020 117 (25) 13991-13996
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摘要：

许多地面和太空观测已经确定，土星在其北极附近有一个持续的六边形流动模式。虽然观测结果很多，但其形成背后的物理学仍然不确定。虽然几个现象学模型已经能够再现这一特征，但缺乏一个自洽的模型来描述土星高度湍流的大气中如何形成如此大规模的多边形喷流。在这里，我们提出了一个三维全非线性滞弹性模拟的气体巨行星外层的深层热对流，自发地产生巨大的极地气旋，激烈的交替纬向流，和高纬度向东射流与多边形图案。模拟分析表明，自组织湍流的形式的巨大的漩涡捏向东的射流，形成多边形的形状。我们认为，一个类似的机制是负责激励土星的六边形流动模式。

英文摘要：

Numerous land and space-based observations have established that Saturn has a persistent hexagonal flow pattern near its north pole. While observations abound, the physics behind its formation is still uncertain. Although several phenomenological models have been able to reproduce this feature, a self-consistent model for how such a large-scale polygonal jet forms in the highly turbulent atmosphere of Saturn is lacking. Here we present a 3D fully-nonlinear anelastic simulation of deep thermal convection in the outer layers of gas giant planets which spontaneously generates giant polar cyclones, fierce alternating zonal flows, and a high latitude eastward jet with a polygonal pattern. The analysis of the simulation suggests that self-organized turbulence in the form of giant vortices pinches the eastward jet, forming polygonal shapes. We argue that a similar mechanism is responsible for exciting Saturn's hexagonal flow pattern.

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