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2 results for “Proterozoic atmosphere”
Varied oxygen simulations with WACCM6 (Proterozoic to pre-industrial atmosphere)
<p>The history of molecular oxygen (O<sub>2</sub>) in Earth's atmosphere is still debated; however, geological evidence supports at least two major episodes where O<sub>2</sub> increased by an order of magnitude or more: the Great Oxidation Event (GOE) and the Neoproterozoic Oxidation Event. O<sub>2 </sub>concentrations have likely fluctuated (between 10<sup>−3</sup> and 1.5 times the present atmospheric level) since the GOE ∼ 2.4 Gyr ago, resulting in a time-varying ozone (O<sub>3</sub>) layer. Using a three-dimensional (3D) chemistry climate model, we simulate changes in O<sub>3</sub> in Earth's atmosphere since the GOE and consider the implications for surface habitability, and glaciation during the Mesoproterozoic. We find lower O<sub>3</sub> columns (reduced by up to 4.68 times for a given O<sub>2</sub> level) compared to previous work; hence, higher fluxes of biologically harmful UV radiation would have reached the surface. Reduced O<sub>3</sub> leads to enhanced tropospheric production of the hydroxyl radical (OH) which then substantially reduces the lifetime of methane (CH<sub>4</sub>). We show that a CH<sub>4</sub> supported greenhouse effect during the Mesoproterozoic is highly unlikely. The reduced O<sub>3</sub> columns we simulate have important implications for astrobiological and terrestrial habitability, demonstrating the relevance of 3D chemistry-climate simulations when assessing paleoclimates and the habitability of faraway worlds.</p>
Varied oxygen simulations with WACCM6 (Proterozoic to pre-industrial atmosphere)
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