Journal Highlights

Insights into the journeys of aerosol particles over the Arctic

Editor’s Highlight—

 

Arctic boundary layer clouds play an important role in the surface energy balance. Given the often-pristine conditions, the optical and microphysical properties of these clouds are sensitive to the number concentration of aerosol particles that can act as cloud condensation nuclei (CCN). This study uses a set of large eddy simulations to show that entrainment of aerosol particles from the free troposphere, in part mediated by the clouds themselves, is an important source of CCN to summertime Arctic boundary layer clouds. If true, these clouds are more susceptible to distant sources of aerosol via long-range transport and subsidence than some previous studies have suggested.

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