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- W4207032741 abstract "The history of molecular oxygen (O$_2$) in Earth's atmosphere is still debated; however, geological evidence supports at least two major episodes where O$_2$ increased by an order of magnitude or more: the Great Oxidation Event (GOE) and the Neoproterozoic Oxidation Event. O$_2$ concentrations have likely fluctuated (between $10^{-3}$ and $1.5$ times the present atmospheric level) since the GOE $sim 2.4$ Gyr ago, resulting in a time-varying ozone (O$_3$) layer. Using a three-dimensional chemistry-climate model, we simulate changes in O$_3$ in Earth's atmosphere since the GOE and consider the implications for surface habitability, and glaciation during the Mesoproterozoic. We find lower O$_3$ columns (reduced by up to $4.68$ times for a given O$_2$ level) compared to previous work; hence, higher fluxes of biologically harmful UV radiation would have reached the surface. Reduced O$_3$ leads to enhanced tropospheric production of the hydroxyl radical (OH) which then substantially reduces the lifetime of methane (CH$_4$). We show that a CH$_4$ supported greenhouse effect during the Mesoproterozoic is highly unlikely. The reduced O$_3$ columns we simulate have important implications for astrobiological and terrestrial habitability, demonstrating the relevance of three-dimensional chemistry-climate simulations when assessing paleoclimates and the habitability of faraway worlds." @default.
- W4207032741 created "2022-01-26" @default.
- W4207032741 creator A5003443811 @default.
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- W4207032741 creator A5030976045 @default.
- W4207032741 creator A5067928914 @default.
- W4207032741 creator A5074548495 @default.
- W4207032741 date "2022-01-01" @default.
- W4207032741 modified "2023-10-18" @default.
- W4207032741 title "A revised lower estimate of ozone columns during Earth’s oxygenated history" @default.
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