14.04.16 Kolloquium: Dr. Johan Schmidt
Dr. Johan Schmidt, department of Chemistry, Universitiy of Copenhagen, Denmark
16:15 - 17:15 Uhr
Recent aircraft observations reveal high concentrations of inorganic bromine and iodine in the tropical free troposphere. We interpret these observations using a new halogen chemical mechanism implemented in the GEOS-Chem 3-D chemical transport model. We find that ozone driven oxidation of bromide on ice cloud droplets and aerosols in the upper troposphere is crucial for maintaining high observed levels of BrO. The high levels of inorganic halogens in free troposphere have implications for tropospheric ozone and NOx (critical air pollutants) and the oxidative capacity of the troposphere.
14. March 2016