Journal Highlights

Isotopic ordering in atmospheric O2 as a tracer of ozone photochemistry and the tropical atmosphere

Editors’ Highlight

Yeung et al report novel observations of the oxygen isotopes of O2 that provide information about the evolution of ozone in Earth's atmosphere.  The measurements span from near the surface to 33 km, and both a box model and 3D chemical transport model help indicate where and how isotopic signatures are reset. Such a proxy will be  helpful to chemistry-climate models investigating the evolution of ozone over time, and as they have shown it can be interpreted using models without needing to incorporate the isotope tracers into the models themselves.