Estimates of the Tropospheric Vertical Structure of Neptune Based on Microwave Radiative Transfer Studies

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A radiative transfer model incorporating, among other things, the recently measured centimeter wavelength opacity of H_2S, the full line catalog of PH_3, and absorption due to CO has been developed to study the tropospheric vertical structure of Neptune. To match radio-telescope observations, subsolar amounts of NH_3 and supersolar amounts of H_2S are found to be needed, as has been previously noted. To match both the measured microwave emission and the measured opacity at 13 cm and 6.3 bars by Voyager 2, an H_2S dominant atmosphere (H_2S/NH_3 ~ 40) with enhanced PH_3 (15 x solar) or NH_3 supersaturation with respect to the putative NH_4SH cloud (400 ppbv) seems to be indicated. Due to the possible importance of PH_3 opacity, it is suggested that measurements of its opacity could aid in resolving some of the outstanding ambiguities concerning Neptune's tropospheric structure.

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