Field measurements of deposition mode ice nucleating particles at Puy de Dôme/

Abstract

Ice nucleating particles are a critical aspect of the atmosphere to study due to their importance for cloud processes, weather, and climate. This thesis discusses deposition mode ice nucleating particle concentrations measured using the SPectrometer for Ice Nuclei at Puy de Dôme, France. These concentrations were most strongly dependent on source of the sampled air mass; meteorology and concentrations of gas phase species were poor predictors of INP abundance. Of particular interest is the distinct difference observed in activated fraction of particles between air masses from continental, marine, and new particle formation event sources, suggesting formation mechanism and particle chemistry as important factors in a particle's ability to nucleate ice. Analysis of new particle formation events also indicates that secondary organic aerosols derived from isoprene could be an important source of ice nucleating particles to consider.