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K. Sugiyama, M. Odaka, K. Kuramoto, Y.-Y. Hayashi (Hokkaido Univ.)
We investigate vertical profiles of adiabatic lapse rate, amount of condensed species, and static stability of the Jovian planet atmospheres by using a newly developed calculation method. Our method consists of three procedures as follows: (1) equilibrium composition is calculated by minimizing Gibbs free energy for various temperatures and pressures, (2) entropy is calculated for the equilibrium composition, and (3) adiabatic curve dS = 0 is obtained by seeking the temperature and pressure relationship under which the value of entropy is conserved. The charcteristics of our method is that no information on the details of corresponding chemical reactions is needed. Therefore, one of the advantages of our method is that we do not have to modify the numerical code when we consider an atmosphere with a different set of elemental compositions and potential temperatures. In previous studies, the adiabatic profile of Jovian planet atmospheres has been obtained by direct calculation of entropy conservation for ascending air parcel according to given chemical reactions (Weidenschilling and Lewis, 1973, Icarus, 20 465--476).
We estimate dependency of vertical profiles of adiabatic lapse rate, amount of condensed species, and static stability on elemental composition for each Jovian planet atmosphere. In this series of calculations, the initial abundances of condensable species are taken from the solar abundance to several ten times the solar. The results of these calculations systematically reveal the effect of atmospheric composition on structure of atmosphere, which are useful for consideration not only of vertical distribution of cloud layers, but also of dynamics of cloud convection within the Jovian planet atmospheres.
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Bulletin of the American Astronomical Society, 34, #3< br> © 2002. The American Astronomical Soceity.