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  Winds in the Middle Cloud Deck From the Near-IR Imaging by the Venus Monitoring Camera Onboard Venus Express

Khatuntsev, I. V., Patsaeva, M. V., Titov, D. V., Ignatiev, N. I., Turin, A. V., Fedorova, A. A., et al. (2017). Winds in the Middle Cloud Deck From the Near-IR Imaging by the Venus Monitoring Camera Onboard Venus Express. Journal of Geophysical Research: Planets, 122(11), 2312-2327. doi:10.1002/2017JE005355.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-41BC-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-41BD-1
Genre: Journal Article

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 Creators:
Khatuntsev, I. V., Author
Patsaeva, M. V., Author
Titov, D. V., Author
Ignatiev, N. I., Author
Turin, A. V., Author
Fedorova, A. A., Author
Markiewicz, Wojciech J.1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_GROUPS: Planets and Comets
 Abstract: For more than 8 years the Venus Monitoring Camera (VMC) onboard the Venus Express orbiter performed continuous imaging of the Venus cloud layer in UV, visible and near-IR filters. We applied the correlation approach to sequences of the near-IR images at 965 nm to track cloud features and determine the wind field in the middle and lower cloud (49–57 km). From the VMC images that spanned from December of 2006 through August of 2013 we derived zonal and meridional components of the wind field. In low-to-middle latitudes (5–65°S) the velocity of the retrograde zonal wind was found to be 68–70 m/s. The meridional wind velocity slowly decreases from peak value of +5.8 ± 1.2 m/s at 15°S to 0 at 65–70°S. The mean meridional speed has a positive sign at 5–65°S suggesting equatorward flow. This result, together with the earlier measurements of the poleward flow at the cloud tops, indicates the presence of a closed Hadley cell in the altitude range 55–65 km. Long-term variations of zonal and meridional velocity components were found during 1,200 Earth days of observation. At 20° ± 5°S the zonal wind speed increases from −67.18 ± 1.81 m/s to −77.30 ± 2.49 m/s. The meridional wind gradually increases from +1.30 ± 1.82 m/s to +8.53 ± 2.14 m/s. Following Bertaux et al. (2016) we attribute this long-term trend to the influence from the surface topography on the dynamical process in the atmosphere via the upward propagation of gravity waves that became apparent in the VMC observations due to slow drift of the Venus Express orbit over Aphrodite Terra.

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Language(s): eng - English
 Dates: 2018-05-072017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/2017JE005355
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Title: Journal of Geophysical Research: Planets
  Other : JGR
Source Genre: Journal
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Publ. Info: Hoboken, NJ : Wiley
Pages: - Volume / Issue: 122 (11) Sequence Number: - Start / End Page: 2312 - 2327 Identifier: ISSN: 2169-9100