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Fig. 8

image

Black solid line: Tp profile adopted throughout the fit to the low-resolution data set. This is the combination of the temperature profile reported in Sing et al. (2016) for the troposphere and by Wyttenbach et al. 2015 for the thermosphere. Red solid line: Best choice to reproduce the high-resolution data set in the case of solar sodium abundance with aerosols at the 0.1 mbar level (HTT). Red background: Region where variations in the Tp profile produce models of similar quality to the HTT model (ΔBICHR < 5). The incompatibility between the HTT Tp profile and the profile by Wyttenbach et al. (2015) is explained by the fact that they did not include aerosols in their analysis. Blue solid line and blue shadowed area: Same analysis for an assumed sodium abundance of 50 times the solar value. In this case the enhanced sodium abundance mimics an aerosol-free atmosphere such as that assumed by Wyttenbach et al. (2015), thus the Tp profiles are compatible. We did not allow for a negative temperature gradient in the P < 10−6 bar region, as it was not physically motivated.

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