Two-dimensional numerical experiments of atmospheric convection with condensation of the major component under early Mars condition

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We have developed a two-dimensional cloud resolving model and investigate the behavior of convection associated with the condensation of the major constituent in a simplified thermal condition considering the warm early Mars atmosphere.When super saturation is not permitted, quasi steady distributions of flow field and cloud are obtained. A cellular convection structure develops below the condensation level, and gravity wave is generated and propagates above the condensation level. Cloud is formed by vertical motion associated with the gravity wave. When super saturation is permitted, the behavior of convection depends on the value of number mixing ratio of condensation nuclei: quasi-steady solution is obtained for relatively large number mixing ratio of condensation nuclei, whereas solution with quasi-periodic temporal variation is obtained for relatively small number mixing ratio. In the latter case, the updrafts develop through only a limited depth of the condensation layer.