Dynamics of the Great Oxidation Event from a 3D photochemical–climate model

Abstract. From the Archean toward Proterozoic, Earth's atmosphere underwent a major shift from anoxic to oxic conditions at around 2.4 2.1 Ga known as Great Oxidation Event (GOE). This rapid transition may be related an atmospheric instability caused by formation of ozone layer. Previous works were all based on 1D photochemical models. Here, we revisit GOE with 3D photochemical–climate model investigate possible impact circulation and coupling between climate dynamics oxidation. We show that diurnal, seasonal transport variations do not bring significant changes compared Nevertheless, highlight temperature dependence for losses. A cooling during late could then have favored triggering oxygenation. In addition, Huronian glaciations, which took place GOE, introduced fluctuation in evolution oxygen level. Finally, overshoot, is expected occurred just after was likely accompanied methane overshoot. Such high concentrations had climatic consequences played role glaciations.