Radiative cooling by CO, H2O, OH and H3+ suppresses hydrodynamic escape of H2 from an early Earth-like atmosphere even at carbon oxide mixing ratios below 1%, extending the H2 envelope lifetime by about an order of magnitude.
Solid lines represent the numerical results, while dashed lines show the values derived from the analytical formula in Equation (8)
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Suppression of hydrodynamic escape of an H2-rich early Earth atmosphere by radiative cooling of carbon oxides
Radiative cooling by CO, H2O, OH and H3+ suppresses hydrodynamic escape of H2 from an early Earth-like atmosphere even at carbon oxide mixing ratios below 1%, extending the H2 envelope lifetime by about an order of magnitude.