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The EnVision and VERITAS missions to Venus will fly with X and Ka bandtelecommunications channels which can be used to conduct radio occultationstudies of Venus' atmosphere. While link attenuation measurements during priorS and X band occultation experiments have been used to determine verticalprofiles of H$_2$SO$_4$ vapor abundance, the addition of the Ka band channelintroduces greater sensitivity to the abundances of H$_2$SO$_4$ aerosols andSO$_2$ gas, permitting retrieval of their vertical profiles from dual bandmeasurements. Such measurements would be valuable in the assessment of chemicaland dynamical processes governing short and long-term variability in Venus'atmosphere. This paper considers the sensitivity of the X/Ka band radioattenuation measurement to these atmospheric constituents, as well asuncertainties and regularization approaches for conducting retrievals of theseatmospheric sulfur species from future occultation experiments. We introducemethods for seeding maximum likelihood estimation retrievals using shape modelsand simple atmospheric transport constraints. From simulated retrievals, weobtain mean errors of the order of 0.5 ppm, 20 ppm, and 10 mg/m$^3$ forH$_2$SO$_4$ vapor, SO$_2$, and H$_2$SO$_4$ aerosol abundances, respectively,for simultaneous retrieval.

Approaches for Retrieving Sulfur Species Abundances from Dual X/Ka Band Radio Occultations of Venus with EnVision and VERITAS