Particle concentration data from: Long-term measurement of sub-3nm particles and their precursor gases in the boreal forest

dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Sulo, Juha
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Sarnela, Nina
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Kontkanen, Jenni
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Ahonen, Lauri
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Paasonen, Pauli
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Laurila, Tiia
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Jokinen, Tuija
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Kangasluoma, Juha
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Sipilä, Mikko
dc.contributor.affiliationLaboratory of Environmental Physics, University of Tartu - Junninen, Heikki
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Petäjä, Tuukka
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Kulmala, Markku
dc.contributor.affiliationnstitute for Atmospheric and Earth System Research/Physics, University of Helsinki - Lehtipalo, Katrianne
dc.contributor.authorSulo, Juha
dc.contributor.authorSarnela, Nina
dc.contributor.authorKontkanen, Jenni
dc.contributor.authorAhonen, Lauri
dc.contributor.authorPaasonen, Pauli
dc.contributor.authorLaurila, Tiia
dc.contributor.authorJokinen, Tuija
dc.contributor.authorKangasluoma, Juha
dc.contributor.authorSipilä, Mikko
dc.contributor.authorJunninen, Heikki
dc.contributor.authorPetäjä, Tuukka
dc.contributor.authorKulmala, Markku
dc.contributor.authorLehtipalo, Katrianne
dc.date.accessioned2025-03-24T15:14:59Z
dc.date.issued2020-10-29
dc.date.issued2020-10-29
dc.descriptionThe knowledge of the dynamics of sub-3nm particles in the atmosphere is crucial for our understanding of first steps of atmospheric new particle formation. Therefore, accurate and stable long-term measurements of the smallest atmospheric particles are needed. In this study, we analyzed over five years of particle concentrations in size classes 1.1–1.7 nm and 1.7–2.5 nm obtained with the Particle Size Magnifier (PSM) and three years of  precursor vapor concentrations measured with the Chemical Ionization Atmospheric Pressure Interface Time-of-Flight mass spectrometer (CI-APi-ToF) at the SMEAR II station in Hyytiälä, Finland. The results show that the 1.1–1.7 nm particle concentrations have a daytime maximum during all seasons, which is due to increased photochemical activity. There are significant seasonal differences in median concentrations of 1.7–2.5 nm particles, underlining the different frequency of new particle formation between seasons. Aerosol precursor vapors have notable diurnal and seasonal differences as well. Sulfuric acid and highly oxygenated organic molecule (HOM) monomer concentrations have clear daytime maxima, while HOM dimers have their maxima during the night. HOM concentrations for both monomers and dimers are the highest during summer and the lowest during winter. Higher median concentrations during summer result from increased biogenic activity in the surrounding forest. Sulfuric acid concentrations are the highest during spring and summer, with autumn and winter concentrations being two to three times lower. A correlation analysis between the sub-3nm concentrations and aerosol precursor vapor concentrations indicates that HOMs, particularly their dimers, and sulfuric acid play a significant role in new particle formation in the boreal forest. Our analysis also suggests that there might be seasonal differences in new particle formation pathways that need to be investigated further.   
dc.identifierhttps://doi.org/10.5281/zenodo.4153280
dc.identifier.urihttps://hydatakatalogi-test-24.it.helsinki.fi/handle/123456789/9457
dc.rightsOpen
dc.rights.licensecc-by-4.0
dc.subjectParticle Size Magnifier
dc.subjectNew Particle Formation
dc.titleParticle concentration data from: Long-term measurement of sub-3nm particles and their precursor gases in the boreal forest
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