The critical role of dimethylamine in the rapid formation of iodic acid particles in marine areas

Abstract Marine new particle formation (NPF) can affect cloud condensation nuclei (CCN) in the global atmosphere. Recently, iodic acid (IA) has been identified as a critical driver for marine NPF. However, atmospheric observations of IA cannot be associated with predicted rates. Given complexity components, other species may promote formation. As an efficient stabilizer acidic precursors, dimethylamine (DMA) wide distribution over oceans. Hence, we investigated nucleation process DMA and under different conditions uncovered corresponding nucleating mechanism using quantum chemical approach Atmospheric Cluster Dynamics Code (ACDC). The findings show that structurally stabilize via hydrogen halogen bonds, clustering is energy barrierless. Moreover, enhance rate clusters by five orders magnitude, its efficiency promoting cluster much higher than NH 3 . Compared to sequential addition IA, IA-DMA plays more dominant role kinetic. Thus, effect on enhancing stability ignored, especially regions near source emissions. Broadly, proposed help explain some missing sources particles and, thus intensive NPF events.