We recently published a technical paper in Atmospheric Chemistry and Physics about the composition of long-range transported aerosol observed at the Pico Mountain Observatory. This work represents a novel perspective on the composition of free tropospheric aerosol. We believe this work is significant because it challenges the current understanding of aerosol aging. Although aerosol are oxidized with respect to time in the atmosphere, the long-lived aerosol observed here appear to represent the fraction of aerosol which is not easily removed.
To learn more please see: Dzepina et al., ACP, 2015.