![]() Air flow that passes at low altitude over central Siberia and western Russia is associated with relatively high concentrations of accumulation-mode particles (Nacc) at all five sites – often above 150 cm⁻³. The residence time of accumulation-mode particles in the Arctic troposphere is typically long enough to allow tracking them back to their source regions. Also, the likelihood of Arctic haze aerosols is minimal in summer and peaks in April at all sites. For instance, the relative occurrence of aerosol number size distributions that indicate new particle formation (NPF) event is near zero during the dark months, increases gradually to ∼ 40 % from spring to summer, and then collapses in autumn. This analysis yields insight into aerosol dynamics, transport and removal processes, on both an intra- and an inter-monthly scale. Together with Lagrangian air parcel back-trajectories, they were used to link the observed aerosol number size distributions with a variety of transport regimes. For this study, a multi-year set of observed aerosol number size distributions in the diameter range of 10 to 500 nm from five sites around the Arctic Ocean (Alert, Villum Research Station – Station Nord, Zeppelin, Tiksi and Barrow) was assembled and analysed.Ī cluster analysis of the aerosol number size distributions revealed four distinct distributions. It is sensitive to human activities that mostly take place elsewhere. The Arctic environment has an amplified response to global climatic change.
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