[MIS26-P06] Formation condition of oceans under hydrogen-rich atmospheres
Keywords:Reducing atmospheres, Formation of oceans, Early surface environment, Habitable zone
Adding hydrogen to a steam atmosphere increases atmospheric scale height. Given that a partial pressure of water vapor at the surface is equal to its saturation pressure, a column mass of water vapor would increase. This means that a larger amount of water is required to keep a sufficient partial pressure for ocean formation.
In this study, we investigate atmospheric structure of an H2-H2O atmosphere using a 1D radiative-convective equilibrium model. We present a relation among incident stellar flux, partial pressure of hydrogen, and a total mass of surface water, which is required for an ocean to form.