cc-by-4.0Petäjä, Tuukka2025-04-292021-09-232021-09-23https://datakatalogi.helsinki.fi/handle/123456789/6732Nitrate-ion (NO3-) chemical ionization (CI) APi-TOF masspectrometer and ion APi-TOF mass spectrometer data reported in Atmospheric Chemistry and Physics: Sipilä, M., Sarnela, N., Neitola, K., Laitinen, T., Kemppainen, D., Beck, L., Duplissy, E.-M., Kuittinen, S., Lehmusjärvi, T., Lampilahti, J., Kerminen, V.-M., Lehtipalo, K., Aalto, P. P., Keronen, P., Siivola, E., Rantala, P. A., Worsnop, D. R., Kulmala, M., Jokinen, T., and Petäjä, T.: Wintertime sub-arctic new particle formation from Kola Peninsula sulphur emissions, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1202, in review, 2021. H2SO4_vs_time_FIG3-FIG4.dat  [Matlab time, measured sulfuric acid concentration] depicted in FIGs 3c and 4c of the above publication. SA_MSA_IA_vs_time_FIG7.dat [Matlab time, measured sulfuric acid concentration, measured methane sulphonic acid concentration, measured iodic acid concentration] depicted in FIG7e of the above publication ion_signals_vs_time_FIG7.dat [Matlab time, ion signal of NO3-, ion signal of HSO4-, ion signal of H2SO4.HSO4-, ion signal of (H2SO4)2.HSO4-, ion signal of NH3.(H2SO4)3.HSO4-, ion signal of NH3.(H2SO4)4.HSO4-] depicted in FIG7f of the above publication   mass_defect_FIG9.dat [mass (Da), mass defect (Da), signal intensity (AU)] depicted in FIG9 of the above publication Rest of the data reported in the publication can be obtained from https://smear.avaa.csc.fi/              Sulfuric acidmethane sulphonic acidiodic acidVärriösub-arcticchemical ionization mass spectrometerdataset