Differing Mechanisms of New Particle Formation at Two Arctic Sites

New particle formation in the Arctic atmosphere is an important source of aerosol particles. Understanding processes secondary crucial due to their significant impact on cloud properties and therefore amplification. We observed molecular new particles from low-volatility vapors at two sites with differing surroundings. In Svalbard, sulfuric acid (SA) methane sulfonic (MSA) contribute some extent condensation nuclei (CCN). This occurs via ion-induced nucleation SA NH3 subsequent growth by mainly MSA during springtime highly oxygenated organic molecules summertime. By contrast, ice-covered region around Villum, we driven iodic but its concentration was insufficient grow nucleated CCN sizes. Our results provide insight about sources precursors