Comparison between ozone column depths and methane lifetimes computed by one- and three-dimensional models at different atmospheric O levels.

Recently, Cooke . (Cooke . 2022 , 211165.

Triple oxygen isotope constraints on atmospheric O and biological productivity during the mid-Proterozoic.

Reconstructing the history of biological productivity and atmospheric oxygen partial pressure (O) is a fundamental goal of geobiology. Recently, the mass-independent fractionation of oxygen isotopes (O-MIF) has been used as a tool for estimating O and productivity during the Proterozoic. O-MIF, reported as Δ'O, is produced during the formation of ozone and destroyed by isotopic exchange with water by biological and chemical processes.

Oxidized micrometeorites suggest either high CO or low N during the Neoarchean.

Tomkins et al. [A. G.

Nitrous oxide from chemodenitrification: A possible missing link in the Proterozoic greenhouse and the evolution of aerobic respiration.

The potent greenhouse gas nitrous oxide (N O) may have been an important constituent of Earth's atmosphere during Proterozoic (~2.5-0.5 Ga).