Two graphs from the paper.
(A) shows reconstructions of delta 36 (i.e., 18O -18O) in Antarctic ice for the Penultimate Glacial Maximum (PGM) and the Last Interglacial (LIG) ( Yan et al. [2022], Figure 1a) and (B) shows the probability distributions of those data as well as data generated by prior studies of the present day (PD), pre-industrial (PI) and the Last Glacial Maximum (LGM) ( Banerjee et al. [2022]; Yeung et al. [2019]).
Editors’ Highlights are summaries of recent papers by AGU’s journal editors.
Source: Geophysical Research Letters

The “clumped isotope” pairing of heavy oxygen isotopes (18O-18O) as a proportion of all oxygen, (mostly 16O-16O), has been used to identify ozone concentrations in the atmosphere. Yan et al. [2022] study oxygen trapped in Antarctic ice and model simulations of atmospheric chemistry to calculate ozone (O3) concentrations in the troposphere in the past. Their efforts to reconstruct atmospheric chemistry in the glacial and interglacial of the penultimate glacial cycle are compared to evidence from earlier studies of the last glacial cycle and present-day.

This progress helps to establish that wildfire may have increased globally as megafaunal extinctions occurred at the end of the last ice age. This new evidence helps to fuel interest in linking atmospheric chemistry with wildfire – with several puzzles yet to be fully reconciled.

Citation: Yan, Y., Banerjee, A., Murray, L. T., Tie, X., & Yeung, L. Y. (2022). Tropospheric ozone during the Last Interglacial. Geophysical Research Letters, 49, e2022GL101113.

—Sarah Feakins, Editor, Geophysical Research Letters

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