Abstract

Latitudinal air ion mobility distribution variations were characterized in the marine boundary layer during a cruise over the Eastern Atlantic and Southern Ocean. We measured concentrations of cluster ions and charged aerosol particles in the size range of 0.4–40 nm. The measured ion mobility distributions were characterized and classified according to meteorological conditions and air mass back-trajectories. New particle formation episodes (bursts of intermediate air ions) were observed above the pack-ice region of the Southern Ocean and several times during showers in the tropical marine boundary layer.

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