globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo3016
论文题名:
Equatorial jet in the lower to middle cloud layer of Venus revealed by Akatsuki
作者: Horinouchi T.; Murakami S.-Y.; Satoh T.; Peralta J.; Ogohara K.; Kouyama T.; Imamura T.; Kashimura H.; Limaye S.S.; McGouldrick K.; Nakamura M.; Sato T.M.; Sugiyama K.-I.; Takagi M.; Watanabe S.; Yamada M.; Yamazaki A.; Young E.F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:9
起始页码: 646
结束页码: 651
语种: 英语
Scopus关键词: cloud ; equatorial dynamics ; image analysis ; jet ; near infrared ; planetary atmosphere ; planetary rotation ; spacecraft ; spectral analysis ; Venus ; zonal flow ; Venusia
英文摘要: The Venusian atmosphere is in a state of superrotation where prevailing westward winds move much faster than the planet's rotation. Venus is covered with thick clouds that extend from about 45 to 70 km altitude, but thermal radiation emitted from the lower atmosphere and the surface on the planet's nightside escapes to space at narrow spectral windows of the near-infrared. The radiation can be used to estimate winds by tracking the silhouettes of clouds in the lower and middle cloud regions below about 57 km in altitude. Estimates of wind speeds have ranged from 50 to 70 ms-1 at low to mid-latitudes, either nearly constant across latitudes or with winds peaking at mid-latitudes. Here we report the detection of winds at low latitude exceeding 80m s-1 using IR2 camera images from the Akatsuki orbiter taken during July and August 2016. The angular speed around the planetary rotation axis peaks near the equator, which we suggest is consistent with an equatorial jet, a feature that has not been observed previously in the Venusian atmosphere. The mechanism producing the jet remains unclear. Our observations reveal variability in the zonal flow in the lower and middle cloud region that may provide clues to the dynamics of Venus's atmospheric superrotation. © 2017 Macmillan Publishers Limited, part of Springer Nature. 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/105725
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: Faculty of Environmental Earth Science, Hokkaido University, N10W5, Sapporo, Hokkaido, Japan; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; Department of Space and Astronautical Science, School of Physical Sciences, Sokendai, Hayama, Japan; School of Engineering, University of Shiga Prefecture, Hikone, Japan; Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan; Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan; Department of Planetology, Center for Planetary Science, Kobe University, Kobe, Japan; Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; National Institute of Technology, Matsue College, Matsue, Japan; Division of Science, Kyoto Sangyo University, Kyoto, Japan; Space Information Center, Hokkaido Information University, Ebetsu, Japan; Planetary Exploration Research Center, Chiba Institute of Technology, Narashino, Japan; Southwest Research Institute, San Antonio, TX, United States

Recommended Citation:
Horinouchi T.,Murakami S.-Y.,Satoh T.,et al. Equatorial jet in the lower to middle cloud layer of Venus revealed by Akatsuki[J]. Nature Geoscience,2017-01-01,10(9)
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