DOI: 10.1038/ngeo2601
论文题名: Simulation of deep-seated zonal jets and shallow vortices in gas giant atmospheres
作者: Heimpel M. ; Gastine T. ; Wicht J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 1 起始页码: 19
结束页码: 23
语种: 英语
Scopus关键词: anticyclone
; cloud cover
; convective system
; cyclone
; jet stream
; Jupiter
; Saturn
; shear flow
; three-dimensional modeling
; upwelling
; vorticity
英文摘要: Jupiter's banded cloud layer hosts spots of various sizes. The bands are defined by eastward and westward jet streams and the spots correspond to vortices, predominantly anticyclones, which rotate in the opposite direction of Earth's cyclonic storms. Despite 350 years of observation, the origin and dynamics of jets and vortices in the atmospheres of giant planets remain debated. Simulations of the shallow weather layer produce both features, but only reproduce observed prograde equatorial flow on Jupiter and Saturn under special conditions. In contrast, deep convection models reproduce equatorial superrotation, but lack coherent vortices. Here we combine both approaches in a three-dimensional simulation where deep convection grades into a stably stratified shallow layer. We find that steady zonal jets are driven by deep convective flows, whereas anticyclonic vortices form where upwelling plumes impinge on the shallow layer. The simulated vortex circulation consists of cool anticyclones shielded by warm downwelling cyclonic rings and filaments, in agreement with observations and theory. We find that the largest vortices form in westward anticyclonic shear flow nearest to the equatorial jet, similar to Saturn's so-called storm alley and Jupiter's Great Red Spot. We conclude that vortices have a deep origin in gas giant atmospheres. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106096
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: University of Alberta, Department of Physics, Edmonton, AB, Canada; Max Planck Institute for Solar System Research, Göttingen, Germany
Recommended Citation:
Heimpel M.,Gastine T.,Wicht J.. Simulation of deep-seated zonal jets and shallow vortices in gas giant atmospheres[J]. Nature Geoscience,2016-01-01,9(1)