Peralta, J., Navarro, T., Vun, C. W., Sanchez-Lavega, A., McGouldrick, K., Horinouchi, T., Imamura, T., Hueso, R., Boyd, J. P., Schubert, G., Kouyama, T., Satoh, T., Iwagami, N., Young, E. F., Bullock, M. A., Machado, P., Lee, Y. J., Limaye, S. S., Nakamura, M., Tellmann, S., Wesley, A. and Miles, P. (2020). A Long-Lived Sharp Disruption on the Lower Clouds of Venus. Geophys. Res. Lett., 47 (11). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

Planetary-scale waves are thought to play a role in powering the yet unexplained atmospheric superrotation of Venus. Puzzlingly, while Kelvin, Rossby, and stationary waves manifest at the upper clouds (65-70 km), no planetary-scale waves or stationary patterns have been reported in the intervening level of the lower clouds (48-55 km), although the latter are probably Lee waves. Using observations by the Akatsuki orbiter and ground-based telescopes, we show that the lower clouds follow a regular cycle punctuated between 30 degrees N and 40 degrees S by a sharp discontinuity or disruption with potential implications to Venus's general circulation and thermal structure. This disruption exhibits a westward rotation period of similar to 4.9 days faster than winds at this level (similar to 6-day period), alters clouds' properties and aerosols, and remains coherent during weeks. Past observations reveal its recurrent nature since at least 1983, and numerical simulations show that a nonlinear Kelvin wave reproduces many of its properties.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Peralta, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Navarro, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vun, C. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Lavega, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McGouldrick, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horinouchi, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Imamura, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hueso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boyd, J. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schubert, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kouyama, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Satoh, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Iwagami, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Young, E. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bullock, M. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Machado, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Y. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Limaye, S. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakamura, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tellmann, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wesley, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Miles, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-329852
DOI: 10.1029/2020GL087221
Journal or Publication Title: Geophys. Res. Lett.
Volume: 47
Number: 11
Date: 2020
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 1944-8007
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MIDDLE; ATMOSPHERE; DYNAMICS; LAYER; CIRCULATION; MORPHOLOGY; WAVESMultiple languages
Geosciences, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/32985

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