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.
The lifetime for the pure H2 atmosphere is obtained by dividing the initial H2 amount by the escape rate of pure hydrogen atmosphere
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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.