Differing mechanisms of new particle formation at two Arctic sites.

• Published in: Geophysical Research Letters
• Main Authors: Beck, Lisa, Sarnela, Nina, Junninen, Heikki, Hoppe, Clara J.M, Garmash, Olga, Bianchi, Federico, Riva, Matthieu, Rose, Clémence, Peräkylä, Otso, Wimmer, Daniela, Kausiala, Oskari, Jokinen, Tuija, Ahonen, Lauri, Mikkilä, Jyri, Hakala, Jani, He, Xucheng, Kontkanen, Jenni, Wolf, Klara.K.E, Cappelletti, David, Mazzola, Mauro, Traversi, Rita, Petroselli, Chiara, Viola, Angelo.p, Vitale, Vito, Lange, Robert, Massling, Andreas, Nojgaard, Jakob k, Krejci, Radovan, Karlsson, Linn, Zieger, Paul, Jang, Sehyun, Lee, Kitack, Vakkari, Ville, Lampilahti, Janne, Thakur, Roseline, Leino (os. Paananen), Katri, Kangasluoma, Juha, Duplissy (née Kyrö), Ella-Maria, Siivola, Erkki, Marbouti, Marjan, Tham, Yee Jun, Saiz-Lopez, Alfonso, Petäjä, Tuukka, Ehn, Mikael, Worsnop, Douglas, Skov, Henrik, Kulmala, Markku, Kerminen, Veli-Matti, Sipilä, Mikko
• Other Authors: INAR Physics, Polar and arctic atmospheric research (PANDA), Faculty of Science, Institute for Atmospheric and Earth System Research (INAR), Air quality research group, Department of Agricultural Sciences, Global Atmosphere-Earth surface feedbacks, Department of Physics
• Format: Manuscript
• Language: English
• Published: American Geophysical Union 2021
• Subjects: 114 Physical sciences; Arctic; Svalbard
• Online Access: http://hdl.handle.net/10138/326936

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