Atmospheric Chemistry Program Seminar
Hydroxyl radical reactivity: Results from field campaigns in Europe and China by Hendrik Fuchs, Forschungszentrum Jülich,
Institute of Energy and Climate Research, Troposphere (IEK-8)
"OH reactivity is the total loss rate coefficient of the hydroxyl radical (OH), the main responsible agent for the oxidation of pollutants in the atmosphere. The direct measurement of this quantity is of great value as it constrains the removal rate of OH in the analysis of the atmospheric budget of OH radicals. In addition, measured OH reactivity can be compared to calculations from individual OH reactant concentration measurements in order to quantify the importance of unmeasured OH reactants. OH reactivity measurements were done on a Zeppelin airship during flights over Europe showing the vertical and horizontal distribution of OH reactants. Ground-based field campaigns in the North China Plain and the Yangtze River Delta in summer- and wintertime were performed between 2006 and 2016 giving an overview of the major OH reactants that contribute to air pollution in China."