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arXiv · 2310.06818

3D simulations of the Archean Earth including photochemical haze profiles

M. T. Mak·N. J. Mayne·D. E. Sergeev·J. Manners·J. K. Eager-Nash·G. Arney·E. Hebrard·K. Kohary
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Abstract

We present results from 3D simulations of the Archean Earth including a prescribed (non-interactive) spherical haze generated through a 1D photochemical model. Our simulations suggest that a thin haze layer, formed when CH4/CO2 = 0.1, leads to global warming of ~10.6 K due to the change of water vapour and cloud feedback, compared to the simulation without any haze. However, a thicker haze layer, formed when CH4/CO2 > 0.1, leads to global cooling of up to ~65 K as the scattering and absorption of shortwave radiation from the haze reduces the radiation from reaching the planetary surface. A thermal inversion is formed with a lower tropopause as the CH4/CO2 ratio increases. The haze reaches an optical threshold thickness when CH4/CO2 ~ 0.175 beyond which the atmospheric structure and the global surface temperature do not vary much.

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M. T. Mak, N. J. Mayne, D. E. Sergeev, J. Manners, J. K. Eager-Nash, G. Arney, E. Hebrard, K. Kohary. 2023-10-10. 3D simulations of the Archean Earth including photochemical haze profiles. https://doi.org/10.1029/2023jd039343

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