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Measurement report: Increasing trend of atmospheric ion concentrations in the boreal forest

Atmospheric chemistry and physics, 2022-11, Vol.22 (23), p.15223-15242 [Peer Reviewed Journal]

COPYRIGHT 2022 Copernicus GmbH ;2022. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1680-7324 ;ISSN: 1680-7316 ;EISSN: 1680-7324 ;DOI: 10.5194/acp-22-15223-2022

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  • Title:
    Measurement report: Increasing trend of atmospheric ion concentrations in the boreal forest
  • Author: Sulo, Juha ; Lampilahti, Janne ; Chen, Xuemeng ; Kontkanen, Jenni ; Nieminen, Tuomo ; Kerminen, Veli-Matti ; Petäjä, Tuukka ; Kulmala, Markku ; Lehtipalo, Katrianne
  • Subjects: Aerosol concentrations ; Aerosol particles ; Aerosols ; Boreal forests ; Clusters ; Coagulation ; Cosmic rays ; Dynamics ; Electric rates ; Forests ; Humidity ; Ion recombination ; Ionization ; Ions ; Limiting factors ; Measurement ; Meteorological conditions ; Nuclear power plants ; Nucleation ; Particle formation ; Radiation ; Recombination ; Taiga ; Trends ; Vapors
  • Is Part Of: Atmospheric chemistry and physics, 2022-11, Vol.22 (23), p.15223-15242
  • Description: The concentration of atmospheric ions affects the total aerosol particle number concentrations in the atmosphere as well as atmospheric new particle formation via ion-induced nucleation, ion–ion recombination, and effects on condensational growth. In this study, we investigate the concentrations and long-term trends of atmospheric ions in a boreal forest environment using 16 years of cluster ion (0.8–2 nm) and intermediate ion (2–7 nm) measurements and characterize the most important factors that explain those trends. We found that the median concentration of cluster ions in a boreal forest was 710 cm−3, the median concentration of 2–4 intermediate ions was 14 cm−3, and the median concentration of 4–7 nm intermediate ions was 9 cm−3. The concentrations of both cluster and intermediate ions have been increasing over the 16-year measurement period, with cluster ion concentrations increasing by about 1 % yr−1 and intermediate ion concentrations increasing 1.7 %–3.9 % yr−1. The increase in cluster ion concentrations can be best explained by the decrease in the coagulation sink caused by larger aerosol particles. Meanwhile, the dependence of intermediate ion concentrations on meteorological conditions is evident, but ionization sources and the coagulation sink do not seem to explain the increasing trend. This is likely because the dynamics of intermediate ions are more complicated, so that ionization sources and the coagulation sink alone cannot directly explain the variation. Season-specific analysis of the ion concentrations suggests that while the coagulation sink is the limiting factor for the ion concentrations in spring and summer, the dynamics are different in autumn and winter. Based on our findings, we recommend that a more comprehensive analysis is needed to determine if the increase in ambient ion concentrations, increasing temperature, and changing abundance of condensable vapors makes ion-mediated and ion-induced nucleation pathways in the boreal forest more relevant in the future.
  • Publisher: Katlenburg-Lindau: Copernicus GmbH
  • Language: English
  • Identifier: ISSN: 1680-7324
    ISSN: 1680-7316
    EISSN: 1680-7324
    DOI: 10.5194/acp-22-15223-2022
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    Directory of Open Access Journals
    Alma/SFX Local Collection
    ProQuest Central
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