B134 鉛直対流によって励起される火星大気の内部重力波

概要

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A numerical simulation is performed by using a two-dimensional anelastic model for clear sky condition to investigate the possible characteristics of internal gravity waves generated by thermal convection in the Martian atmosphere. The results show that the vertical and horizontal wave length of simulated internal gravity wave are 10km and 10∿ 15km, respectively. The resultant time series show that the vertical phase velocity are about 10m/sec. According to the dispersion relationship of internal gravity wave, the vertical group velocity become about several m/sec. The horizontal mean value of "effective vertical diffusion coefficient", which is the vertical diffusion coefficient when the vertical diffusion is only responsible for the heat flux, has the same order of magnitude of that used by the 1D photochemical model. The result suggests that the internal gravity wave generated by thermal convection in the Martian lower atmosphere contributes to the vertical mixing in the Martian middle atmosphere.
日本流体力学会の論文
2002-07-23