Interactions between natural short-lived halogens and atmospheric oxidation capacity

Observational evidence shows the ubiquitous presence of short-lived halogens in the global atmosphere. This includes the biogenic contribution of organic very short-lived halocarbons as well as the abiotic source of inorganic halogens throughout heterogeneous recycling. All of these species are naturally emitted from the oceans, polar ice, and the biosphere, presenting a pronounced spatio-temporal source strength that controls the regional, vertical and seasonal distribution in the troposphere. In addition, anthropogenic emissions of reactive halogens, both organic and inorganic, have been identified in the atmosphere. Most notably, short-lived halogen emissions influence the oxidative capacity of the troposphere and consequently the concentration of ozone and methane. In this communication, we use the halogen version of CAM-Chem to evaluate how these interactions evolve across pre-industrial, present-day, and future climates under different halogen emission scenarios.