气候变化领域集成服务门户(CCPortal): Deep rotating convection generates the polar hexagon on Saturn

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DOI	10.1073/pnas.2000317117
	Deep rotating convection generates the polar hexagon on Saturn
	Yadav R.K.; Bloxham J.
发表日期	2020
ISSN	0027-8424
起始页码	13991
结束页码	13996
卷号	117 期号:25
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 three-dimensional (3D) fully nonlinear anelastic simulation of deep thermal convection in the outer layers of gas giant planets that 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. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Planetary atmospheres; Rotating convection; Turbulence
语种	英语
scopus关键词	article; astronomy; atmosphere; hurricane; latitude; simulation; thermodynamics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160279
作者单位	Yadav, R.K., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Bloxham, J., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States
推荐引用方式 GB/T 7714	Yadav R.K.,Bloxham J.. Deep rotating convection generates the polar hexagon on Saturn[J],2020,117(25).
APA	Yadav R.K.,&Bloxham J..(2020).Deep rotating convection generates the polar hexagon on Saturn.Proceedings of the National Academy of Sciences of the United States of America,117(25).
MLA	Yadav R.K.,et al."Deep rotating convection generates the polar hexagon on Saturn".Proceedings of the National Academy of Sciences of the United States of America 117.25(2020).