globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1764
论文题名:
A chaotic long-lived vortex at the southern pole of Venus
作者: Garate-Lopez I.; Hueso R.; Sánchez-Lavega A.; Peralta J.; Piccioni G.; Drossart P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:4
起始页码: 254
结束页码: 257
语种: 英语
Scopus关键词: atmospheric forcing ; Earth ; insolation ; Mars ; morphology ; planetary atmosphere ; polar vortex ; surface temperature ; Venus
英文摘要: Polar vortices are common in the atmospheres of rapidly rotating planets1-4. On Earth and Mars, vortices are generated by surface temperature gradients and their strength is modulated by the seasonal insolation cycle. Slowly rotating Venus lacks pronounced seasonal forcing, but vortices are known to occur at both poles, in an atmosphere that rotates faster than the planet itself5-8. Here we report observations of cloud motions at altitudes of 42 and 63 km above Venus's south pole using infrared images from the VIRTIS instrument onboard the Venus Express spacecraft. We find that the south polar vortex is a long-lived but unpredictable feature. Within the two cloud layers sampled, the centres of rotation of the vortex are rarely aligned vertically and both wander erratically around the pole with velocities of up to 16 m s-1. At the two horizontal levels, the observed cloud morphologies do not correlate with the vorticity of the wind field and change continuously, and vertical and meridional wind shears are also highly variable. We conclude that Venus's south polar vortex is a continuously evolving structure that is at least 20 km high, extending through a quasi-convective turbulent region. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106818
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: Departamento Física Aplicada i, Escuela Técnica Superior de Ingeniería, Universidad Del País Vasco (UPV/EHU), Alda. Urquijo s/n, 48013 Bilbao, Spain; Unidad Asociada Grupo Ciencias Planetarias UPV/EHU-IAA(CSIC), 48013 Bilbao, Spain; Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomí, 18008 Granada, Spain; Observatório Astronómico de Lisboa (CAAUL), Tapada da Ajuda, 1349-018 Lisboa, Portugal; IASF/INAF, 100 Via del Fosso del Cavaliere, 00133 Rome, Italy; LESIA/Observatoire de Paris, CNRS UPMC, Univ. Paris-Diderot, 5, Place Jules Janssen, 92195 Meudon, France

Recommended Citation:
Garate-Lopez I.,Hueso R.,Sánchez-Lavega A.,et al. A chaotic long-lived vortex at the southern pole of Venus[J]. Nature Geoscience,2013-01-01,6(4)
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