Experimental study of H<sub>2</sub>SO<sub>4</sub> aerosol nucleation at high ionization levels
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Published:2018-04-27
Issue:8
Volume:18
Page:5921-5930
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Tomicic Maja, Bødker Enghoff MartinORCID, Svensmark Henrik
Abstract
Abstract. One hundred and ten direct measurements of aerosol nucleation rate at high
ionization levels were performed in an 8 m3 reaction chamber. Neutral and
ion-induced particle formation from sulfuric acid (H2SO4) was
studied as a function of ionization and H2SO4 concentration. Other
species that could have participated in the nucleation, such as NH3
or organic compounds, were not measured but assumed constant, and the
concentration was estimated based on the parameterization by
Gordon et al. (2017). Our parameter space is thus [H2SO4] =4×106-3×107 cm−3, [NH3+ org] = 2.2 ppb, T=295 K,
RH = 38 %, and ion concentrations of 1700–19 000 cm−3. The
ion concentrations, which correspond to levels caused by a nearby supernova,
were achieved with gamma ray sources. Nucleation rates were directly measured
with a particle size magnifier (PSM Airmodus A10) at a size close to critical
cluster size (mobility diameter of ∼ 1.4 nm) and formation rates at a
mobility diameter of ∼ 4 nm were measured with a CPC (TSI model 3775).
The measurements show that nucleation increases by around an order of
magnitude when the ionization increases from background to supernova levels
under fixed gas conditions. The results expand the parameterization presented
in Dunne et al. (2016) and Gordon et al. (2017) (for [NH3+org] =
2.2 ppb and T=295 K) to lower sulfuric acid concentrations and higher
ion concentrations. The results make it possible to expand the
parameterization presented in Dunne et al. (2016) and Gordon et al. (2017) to
higher ionization levels.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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