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Main Title: Potential vorticity of the south polar vortex of Venus
Author(s): Garate‐Lopez, Itziar
Hueso, R.
Sánchez‐Lavega, Agustin
García Muñoz, Antonio
Type: Article
Language Code: en
Abstract: Venus' atmosphere shows highly variable warm vortices over both of the planet's poles. The nature of the mechanism behind their formation and properties is still unknown. Potential vorticity is a conserved quantity when advective processes dominate over friction and diabatic heating and is a quantity frequently used to model balanced flows. As a step toward understanding the vortices' dynamics, we present maps of Ertel's potential vorticity (EPV) at Venus' south polar region. We analyze three configurations of the south polar vortex at the upper cloud level (P ~ 240 mbar; z ~ 58 km), based on our previous analyses of cloud motions and thermal structure from data acquired by the Visual and InfraRed Thermal Imaging Spectrometer instrument on board Venus Express. Additionally, we tentatively estimate EPV at the lower cloud level (P ~ 2200 mbar; z ~ 43 km), based on our previous wind measurements and on static stability data from Pioneer Venus and the Venus International Reference Atmosphere (VIRA) model. Values of EPV are on the order of 10−6 and 10−8 K m2 kg−1 s−1 at the upper and lower cloud levels, respectively, being 3 times larger than the estimated errors. The morphology observed in EPV maps is mainly determined by the structures of the vertical component of the relative vorticity. This is in contrast to the vortex's morphology observed in 3.8 or 5 µm images which are related to the thermal structure of the atmosphere at the cloud top. Some of the EPV maps point to a weak ringed structure in the upper cloud, while a more homogenous EPV field is found in the lower cloud.
Issue Date: 14-Mar-2016
Date Available: 9-Dec-2019
DDC Class: 550 Geowissenschaften
Subject(s): venus atmosphere
south polar vortex
Ertel's potential vorticity
Journal Title: Journal of Geophysical Research: Planets
Publisher: American Geophysical Union
Publisher Place: Hoboken, NJ
Volume: 121
Issue: 4
Publisher DOI: 10.1002/2015JE004885
Page Start: 574
Page End: 593
EISSN: 2169-9100
ISSN: 2169-9097
Notes: ©2016. American Geophysical Union
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

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