Preprints
https://doi.org/10.5194/cp-2021-150
https://doi.org/10.5194/cp-2021-150

  24 Nov 2021

24 Nov 2021

Review status: this preprint is currently under review for the journal CP.

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

Adam Yassin Jaziri1, Benjamin Charnay2, Franck Selsis1, Jérémy Leconte1, and Franck Lefèvre3 Adam Yassin Jaziri et al.
  • 1Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France
  • 2LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, 92195 Meudon, France
  • 3Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), CNRS/IPSL/UPMC, Paris, France

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

Adam Yassin Jaziri et al.

Status: open (until 19 Jan 2022)

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Adam Yassin Jaziri et al.

Adam Yassin Jaziri et al.

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Short summary
In the context of understanding 3D photochemical effect on the Earth oxygenation that happened around 2.4 Gyr, we developed a 3D photochemical-climate model to investigate the possible impact of the atmospheric circulation and the coupling between the climate and the dynamics of the oxidation. We show that the diurnal, seasonal and transport variations do not bring significant changes compared to 1D models. Nevertheless, we highlight a temperature dependence for atmospheric photochemical losses.