DOI: 10.1073/pnas.2008440117
论文题名: Modeling the stability of polygonal patterns of vortices at the poles of Jupiter as revealed by the Juno spacecraft
作者: Li C. ; Ingersoll A.P. ; Klipfel A.P. ; Brettle H.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 39 起始页码: 24082
结束页码: 24087
语种: 英语
英文关键词: Juno
; Jupiter
; Shallow water model
; Vortex dynamics
Scopus关键词: Article
; astronomy
; atmosphere
; gravity
; jupiter (planet)
; motion
; priority journal
; saturn (planet)
; simulation
; space flight
; surface property
; velocity
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163387
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(39)