Long-range transport of continental aerosols over the Atlantic Ocean and their effects on cloud structures

Abstract

Airborne measurements of aerosols and cloud microstructures were made in the vicinity of the Azores Islands. Two dichotomous cases are examined: a clean marine air mass and a continentally influenced air mass. The clean marine air mass had relatively low Aitken nucleus (CN) and cloud condensation nucleus (CCN) concentrations, while the continentally influenced air mass had high CN and CCN concentrations. Also, black carbon, sulfate, and SO2 concentrations were significantly higher in the continentally influenced air mass. The continentally influenced air mass had a monomodal aerosol number distribution with a peak at about 0.05-μm radius, whereas the clean marine air mass had a bimodal aerosol number distribution with peaks at about 0.02 and 0.08 μm radius. -from Authors