22 Apr 2022
22 Apr 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Atmospheric new particle formation in a coastal agricultural site explained with binPMF analysis of nitrate CI-APi-TOF spectra

Miska Olin1, Magdalena Okuljar2, Matti P. Rissanen1, Joni Kalliokoski1, Jiali Shen2, Lubna Dada2,3, Markus Lampimäki2, Yusheng Wu2, Annalea Lohila2,4, Jonathan Duplissy2,5, Mikko Sipilä2, Tuukka Petäjä2, Markku Kulmala2,6,7, and Miikka Dal Maso1 Miska Olin et al.
  • 1Aerosol Physics Laboratory, Faculty of Engineering and Natural Sciences, Tampere University, Tampere, Finland
  • 2Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
  • 3Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland
  • 4Climate System Research, Finnish Meteorological Institute, Helsinki, Finland
  • 5Helsinki Institute of Physics (HIP)/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
  • 6Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Sciences and Engineering, Beijing University of Chemical Technology (BUCT), Beijing, China
  • 7Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China

Abstract. The occurrence of new particle formation (NPF) events detected in a coastal agricultural site, at Qvidja, in Southwestern Finland, was investigated using the data measured with a nitrate ion-based chemical-ionization mass spectrometer (CI-APi-TOF). The binned positive matrix factorization method (binPMF) was applied to the measured spectra. It resulted in eight factors describing the time series of ambient gas and cluster composition at Qvidja during spring 2019. The most interesting factors related to the observed NPF events were the two factors with the highest mass-to-charge ratios, numbered 7 and 8, both having profiles with patterns of highly oxygenated organic molecules. It was observed that the factor 7 had elevated intensities during the NPF events. A variable with an even better connection to the observed NPF events is fF7, which denotes the fraction of the total spectra within the studied mass-to-charge ratio range between 169 and 450 Th being in a form of the factor 7. Values of fF7 higher than 0.5 were typically observed during the NPF events, of which durations also correlated with the duration of fF7 exceeding the critical value of 0.5. It was also observed that the factor 8 acts as a precursor of the factor 7 with high solar irradiance levels.

Miska Olin et al.

Status: open (until 09 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-261', Anonymous Referee #1, 14 May 2022 reply
  • RC2: 'Comment on acp-2022-261', Anonymous Referee #2, 17 May 2022 reply

Miska Olin et al.

Data sets

Atmospheric data measured in Qvidja, Finland, from Apr to Jun 2019 Miska Olin

Miska Olin et al.


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Short summary
Atmospheric new particle formation is an important source of the total particle number concentration in the atmosphere. Several parameters for predicting new particle formation events have been suggested before, but the results have been inconclusive. This study proposes an another predicting parameter, related to a specific type of highly oxidized organic molecules, especially for similar locations to the measurement site in this study, which was a coastal agricultural site in Finland.