Gromov, Sergey , Röckmann, Thomas , Laskar, Amzad H. and Peethambaran, Rahul (2019) Modelling the abundance of 18O18O in the atmosphere and its sensitivity to temperature and ozone photochemistry. [Talk] In: EGU General Assembly 2019. , 07.-12.04.2019, Vienna, Austria . DOI 10.5281/zenodo.3545956.

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Abstract

Atmospheric temperature and ozone photochemistry are recognised to play dominant roles in setting the abundance of 18O18O isotopologues (expressed via Δ36) of atmospheric oxygen. Here, we use the AC-GCM EMAC to simulate the abundance of atmospheric 18O18O in a most consistent to date kinetic chemistry modelling framework.

Extensive model diagnostics allow us quantifying contribution of various factors into changes in Δ36 since the last 60 years. It is shown that atmospheric dynamics is another fundamental ingredient of atmospheric Δ36 distribution.

We discuss potential applications of clumped O2 composition for quantifying various atmospheric processes like decadal changes in tropospheric O3 abundance or tropopause warming due to volcanism.

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