JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS06] Science of Venus: Venus Express, Akatsuki, and beyond

convener:Takehiko Satoh(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Kevin McGouldrick(University of Colorado Boulder), Hideo Sagawa(Kyoto Sangyo University), Thomas Widemann(Observatoire De Paris)

[PPS06-P13] Dynamics of Decadal Sulfur Dioxide Variability in Venus' Atmosphere with a Simple Model

*Pushkar Kopparla1, Ashwin Seshadri2, Takeshi Imamura1, Yeon Joo Lee3, Javier Peralta4 (1.University of Tokyo, 2.Indian Institute of Science, 3.Technical University of Berlin, 4.ISAS JAXA)

Keywords:Venus, Venus atmosphere, oscillations, atmospheric variability

Water and sulfur dioxide are important trace gases in the atmosphere of Venus. The photolysis of sulfur dioxide in the upper clouds produces sulfuric acid, which forms the thick cloud decks characteristic of the planet's atmosphere. Sulfur dioxide concentrations at the cloud top of Venus have been observed to oscillate on decadal timescales, characterized by sharp spikes and gradual declines. The variation is suspected to occur due to dynamical variability in the deep atmosphere of Venus but the exact mechanism has remained a mystery. Using a simple one dimensional box model where water and sulfur dioxide are cycled between the cloud tops and the deep atmosphere, we explore the dynamics of the sulfur dioxide oscillations. We find that the periodicity of the oscillation is dependent on vertical transport and thermal decomposition timescales in the deep atmosphere, while the shape of the oscillation depends on the transport timescale in the cloud layer.