globalchange  > 气候减缓与适应
DOI: 10.1029/2018JE005627
Scopus记录号: 2-s2.0-85052837778
论文题名:
Fine Vertical Structures at the Cloud Heights of Venus Revealed by Radio Holographic Analysis of Venus Express and Akatsuki Radio Occultation Data
作者: Imamura T.; Miyamoto M.; Ando H.; Häusler B.; Pätzold M.; Tellmann S.; Tsuda T.; Aoyama Y.; Murata Y.; Takeuchi H.; Yamazaki A.; Toda T.; Tomiki A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:8
起始页码: 2151
结束页码: 2161
语种: 英语
英文关键词: Akatsuki ; atmosphere ; FSI ; radio occultation ; Venus ; Venus Express
英文摘要: Radio occultation (RO) is one of the most efficient techniques for studying fine vertical structures in planetary atmospheres. However, the geometrical optics (GO) method, which has been used for the analysis of RO data, suffers blurring by the finite width (Fresnel scale) of the radio ray and cannot decipher multipath propagation, which also prevents retrieval of fine structures. Here we apply Full Spectrum Inversion (FSI), which is one of the radio holographic methods, to RO data taken in Venus Express and Akatsuki missions to retrieve fine structures in Venus' cloud-level atmosphere. The temperature profiles obtained by FSI achieve vertical resolutions of ~150 m, which is much higher than the typical resolution of 400–700 m in GO, and resolve structures in multipath regions. Thin, near-neutral layers are found to be ubiquitous at cloud heights; we suggest here that those layers are caused by the mixing associated with the breaking of short-wavelength gravity waves. The wavenumber spectra of small-scale structures are consistent with the semiempirical spectrum of saturated gravity waves and show larger amplitudes at higher latitudes. Temperature profiles in the high latitudes frequently show a sharp temperature minimum near the cloud top, below which the vertical temperature gradient is near adiabat, implying that the sharp temperature minimum is created by adiabatic cooling associated with convective plumes that impinge on the overlying stable layer. ©2018. American Geophysical Union. 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/113319
Appears in Collections:气候减缓与适应

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作者单位: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan; Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan; Faculty of Science, Kyoto Sangyo University, Kyoto, Japan; Institut für Raumfahrttechnik und Weltraumnutzung, Universität der Bundeswehr München, Neubiberg, Germany; Abteilung Planetenforschung, Rheinisches Institut für Umweltforschung, Universität zu Köln, Cologne, Germany; Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan; National Institute of Polar Research, Tachikawa, Japan; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan

Recommended Citation:
Imamura T.,Miyamoto M.,Ando H.,et al. Fine Vertical Structures at the Cloud Heights of Venus Revealed by Radio Holographic Analysis of Venus Express and Akatsuki Radio Occultation Data[J]. Journal of Geophysical Research: Planets,2018-01-01,123(8)
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