气候变化领域集成服务门户(CCPortal): Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft

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DOI	10.1073/pnas.2008440117
	Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft
	Li C.; Ingersoll A.P.; Klipfel A.P.; Brettle H.
发表日期	2020
ISSN	0027-8424
起始页码	24082
结束页码	24087
卷号	117 期号:39
英文摘要	From its pole-to-pole orbit, the Juno spacecraft discovered arrays of cyclonic vortices in polygonal patterns around the poles of Jupiter. In the north, there are eight vortices around a central vortex, and in the south there are five. The patterns and the individual vortices that define them have been stable since August 2016. The azimuthal velocity profile vs. radius has been measured, but vertical structure is unknown. Here, we ask, what repulsive mechanism prevents the vortices from merging, given that cyclones drift poleward in atmospheres of rotating planets like Earth? What atmospheric properties distinguish Jupiter from Saturn, which has only one cyclone at each pole? We model the vortices using the shallow water equations, which describe a single layer of fluid that moves horizontally and has a free surface that moves up and down in response to fluid convergence and divergence. We find that the stability of the pattern depends mostly on shielding-an anticyclonic ring around each cyclone, but also on the depth. Too little shielding and small depth lead to merging and loss of the polygonal pattern. Too much shielding causes the cyclonic and anticyclonic parts of the vortices to fly apart. The stable polygons exist in between. Why Jupiter's vortices occupy this middle range is unknown. The budget-how the vortices appear and disappear-is also unknown, since no changes, except for an intruder that visited the south pole briefly, have occurred at either pole since Juno arrived at Jupiter in 2016. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Juno; Jupiter; Shallow water model; Vortex dynamics
语种	英语
scopus关键词	Article; astronomy; atmosphere; gravity; jupiter (planet); motion; priority journal; saturn (planet); simulation; space flight; surface property; velocity
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/160217
作者单位	Li, C., Astronomy Department, University of California, Berkeley, CA 94720, United States; Ingersoll, A.P., Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; Klipfel, A.P., Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; Brettle, H., Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Li C.,Ingersoll A.P.,Klipfel A.P.,et al. Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft[J],2020,117(39).
APA	Li C.,Ingersoll A.P.,Klipfel A.P.,&Brettle H..(2020).Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft.Proceedings of the National Academy of Sciences of the United States of America,117(39).
MLA	Li C.,et al."Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft".Proceedings of the National Academy of Sciences of the United States of America 117.39(2020).