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DOI | 10.1029/2019GL083820 |
Global Structure of Thermal Tides in the Upper Cloud Layer of Venus Revealed by LIR on Board Akatsuki | |
Kouyama, T.1; Taguchi, M.2; Fukuhara, T.2; Imamura, T.3; Horinouchi, T.4; Sato, T. M.5; Murakami, S.6; Hashimoto, G. L.7; Lee, Y. J.8; Futaguchi, M.9; Yamada, T.2; Akiba, M.2; Satoh, T.6; Nakamura, M.6 | |
2019-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:16页码:9457-9465 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; Germany |
英文摘要 | Longwave Infrared Camera (LIR) on board Akatsuki first revealed the global structure of the thermal tides in the upper cloud layer of Venus. The data were acquired over three Venusian years, and the analysis was done over the areas from the equator to the midlatitudes in both hemispheres and over the whole local time. Thermal tides at two vertical levels were analyzed by comparing data at two different emission angles. Dynamical wave modes consisting of tides were identified; the diurnal tide consisted mainly of Rossby-wave and gravity-wave modes, while the semidiurnal tide predominantly consisted of a gravity-wave mode. The revealed vertical structures were roughly consistent with the above wave modes, but some discrepancy remained if the waves were supposed to be monochromatic. In turn, the heating profile that excites the tidal waves can be constrained to match this discrepancy, which would greatly advance the understanding of the Venusian atmosphere. Plain Language Summary On Venus, the atmosphere circulates 60 times faster than the solid body of Venus; this phenomenon is called "superrotation," and it is one of the mysteries of the Venusian atmosphere. To maintain the fast circulation, thermal tides, which are global-scale atmospheric waves excited by solar heating, have been considered a very important candidate because they have the ability of accelerating the atmosphere through propagating. A midinfrared camera onboard the Japanese Venus orbiter, Akatsuki, can capture temperature perturbations due to the thermal tides in the upper cloud level (60- to 70-km altitude), and it revealed their global and vertical structures with a long-term observation (more than three Venusian years) for the first time. Interestingly, we found that the location of the maximum temperature at the cloud top level was different from noon where solar energy input is at a maximum. In addition, the location was shifted toward the morning side as the sensing altitude increased. This finding is an evidence of the vertical traveling of the thermal tides, indicating the wave's atmospheric acceleration. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700018 |
WOS关键词 | INFRARED CAMERA ONBOARD ; MIDDLE ATMOSPHERE ; TEMPERATURE ; TOP ; NIGHTSIDE ; FEATURES ; WAVES ; WINDS ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186228 |
专题 | 气候变化 |
作者单位 | 1.Natl Inst Adv Ind Sci & Technol, Artificial Res Ctr, Tokyo, Japan; 2.Rikkyo Univ, Coll Sci, Tokyo, Japan; 3.Univ Tokyo, Grad Sch Frontier Sci, Tokyo, Japan; 4.Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido, Japan; 5.Hokkaido Informat Univ, Space Informat Ctr, Ebetsu, Hokkaido, Japan; 6.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan; 7.Okayama Univ, Fac Sci, Okayama, Japan; 8.Tech Univ Berlin, Zentrum Astron & Astrophys, Berlin, Germany; 9.Toho Univ, Omori Med Ctr, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Kouyama, T.,Taguchi, M.,Fukuhara, T.,et al. Global Structure of Thermal Tides in the Upper Cloud Layer of Venus Revealed by LIR on Board Akatsuki[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9457-9465. |
APA | Kouyama, T..,Taguchi, M..,Fukuhara, T..,Imamura, T..,Horinouchi, T..,...&Nakamura, M..(2019).Global Structure of Thermal Tides in the Upper Cloud Layer of Venus Revealed by LIR on Board Akatsuki.GEOPHYSICAL RESEARCH LETTERS,46(16),9457-9465. |
MLA | Kouyama, T.,et al."Global Structure of Thermal Tides in the Upper Cloud Layer of Venus Revealed by LIR on Board Akatsuki".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9457-9465. |
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