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The Venus Emissivity Mapper - Investigating the Atmospheric Structure and Dynamics of Venus' Polar Region

Widemann, T. and Marcq, E. and Tsang, C. C. C. and Müller, N. and Kappel, David and Helbert, Jörn and Dyar, M. D. and Smrekar, S.E. (2017) The Venus Emissivity Mapper - Investigating the Atmospheric Structure and Dynamics of Venus' Polar Region. In: AGU Fall Meeting, P53A-2205-P53A-2205. AGU Fall meeting, 11 Dec - 15 Dec 2017, New Orleans, LA, USA.

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Official URL: https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/233737


Venus' climate evolution is driven by the energy balance of its global cloud layers. Venus displays the best-known case of polar vortices evolving in a fast-rotating atmosphere. Polar vortices are pervasive in the Solar System and may also be present in atmosphere-bearing exoplanets. While much progress has been made since the early suggestion that the Venus clouds are H2O-H2SO4 liquid droplets (Young 1973), several cloud parameters are still poorly constrained, particularly in the lower cloud layer and optically thicker polar regions. The average particle size is constant over most of the planet but increases toward the poles. This indicates that cloud formation processes are different at latitudes greater than 60°, possibly as a result of the different dynamical regimes that exist in the polar vortices (Carlson et al. 1993, Wilson et al. 2008, Barstow et al. 2012). Few wind measurements exist in the polar region due to unfavorable viewing geometry of currently available observations. Cloud-tracking data indicate circumpolar circulation close to solid-body rotation. E-W winds decrease to zero velocity close to the pole. N-S circulation is marginal, with extremely variable morphology and complex vorticity patterns (Sanchez-Lavega et al. 2008, Luz et al. 2011, Garate-Lopez et al. 2013). The Venus Emissivity Mapper (VEM; Helbert et al., 2016) proposed for NASA’s Venus Origins Explorer (VOX) and the ESA M5/EnVision orbiters has the capability to better constrain the microphysics (vertical, horizontal, time dependence of particle size distribution, or/and composition) of the lower cloud particles in three spectral bands at 1.195, 1.310 and 1.510 micron at a spatial resolution of ~10 km. Circular polar orbit geometry would provide an unprecedented study of both polar regions within the same mission. In addition, VEM's pushbroom method will allow short timescale cloud dynamics to be assessed, as well as local wind speeds, using repeated imagery at 90 minute intervals. Tracking lower cloud motions as proxies for wind measurements at high spatial resolutions will greatly benefit modeling of the vortice's physics, as well as wave-generating dynamical instabilities (Garate-Lopez et al. 2015).

Item URL in elib:https://elib.dlr.de/124829/
Document Type:Conference or Workshop Item (Poster)
Title:The Venus Emissivity Mapper - Investigating the Atmospheric Structure and Dynamics of Venus' Polar Region
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Marcq, E.University of Versailles Saint-Quentin en YvelinesUNSPECIFIED
Tsang, C. C. C.Southwest Research Institute, Boulder, CO 80302, USAUNSPECIFIED
Müller, N.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA, 91109UNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.dehttps://orcid.org/0000-0002-0518-5548
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Dyar, M. D.Planetary Science Institute, 1700 East Fort Lowell, Tucson, AZ; Dept. of Astronomy, Mount Holyoke College, South Hadley, MAUNSPECIFIED
Smrekar, S.E.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Date:15 December 2017
Journal or Publication Title:AGU Fall Meeting
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:P53A-2205-P53A-2205
Keywords:Venus, remote sensing, spectroscopy
Event Title:AGU Fall meeting
Event Location:New Orleans, LA, USA
Event Type:international Conference
Event Dates:11 Dec - 15 Dec 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Venus Emissivity Mapper
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:12 Dec 2018 12:09
Last Modified:12 Dec 2018 12:09

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