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Long timescale variations of the Venus photochemical cloud driven by microphysics

Presentation #204.04 in the session Venus.

Published onOct 20, 2022
Long timescale variations of the Venus photochemical cloud driven by microphysics

The composition of the smallest mode of particles in the Venus atmosphere, which likely serve as Cloud Condensation Nuclei (CCN) is unknown. Hence, the details of how their microphysical properties might affect the structure and variability of the Venus clouds at all altitudes is similarly unknown. Previous work had shown that temperature-dependent coalescence efficiency could be responsible for rapid changes of large magnitude in aerosol opacity. Furthermore, observational data of the Venus clouds at wavelengths ranging from the near-ultraviolet to the near-infrared demonstrate evidence of cloud opacity variation on both long and short timescales. Having incorporated Venus microphysics and radiative transfer calculations into the PlanetCARMA model, we investigate whether a change in the ability of CCN to grow via coagulation in the Venus atmosphere can produce measurable short term and long term signatures in the Venus cloud structure. We also investigate whether such changes in aerosol opacity might be detectable via current remote sensing measurement techniques of assessing the venusian aerosol distribution.

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