Aerosol particle formation in the upper residual layer

Abstract. According to current estimates, atmospheric new particle formation (NPF) produces a large fraction of aerosol particles and cloud condensation nuclei in the Earth's atmosphere, which have implications for health climate. Despite recent advances, NPF is still insufficiently understood lower troposphere, especially above mixed layer (ML). This paper presents results from co-located airborne ground-based measurements boreal forest environment, showing that many events (∼42 %) appear start topmost part residual (RL). The freshly formed may be entrained into growing (ML) where they continue grow size, similar within ML. suggest upper RL has an important contribution load boundary (BL).