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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-916
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Jan 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Estimation of atmospheric particle formation rates through an analytical formula: Validation and application in Hyytiälä and Puijo, Finland
Elham Baranizadeh1, Tuomo Nieminen1, Taina Yli-Juuti1, Markku Kulmala2, Tuukka Petäjä2, Ari Leskinen1,3, Mika Komppula3, Ari Laaksonen1,4, and Kari E. J. Lehtinen1,3 1Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
2Department of Physics, University of Helsinki, Finland
3Finnish Meteorological Institute, Kuopio, Finland
4Climate research Unit, Finnish Meteorological Institute, Helsinki, Finland
Abstract. The formation rates of 3-nm particles were estimated at SMEAR IV, Puijo (Finland) where the continuous measurements extend only down to 7 nm in diameter. We extrapolated the formation rates at 7 nm (J7) down to 3 nm (J3) based on an approximate solution to the aerosol general dynamic equation, assuming a constant condensational growth rate, a power-law size dependent scavenging rate and negligible self-coagulation rate for the nucleation mode particles. To evaluate our method, we first applied it to new-particle formation (NPF) events in Hyytiälä (Finland), which extend down to 3 nm, and, therefore, J3 and J7 can be determined directly from the measured size distribution evolution. The Hyytiälä results show that the estimated daily mean J3 slightly overestimate the observed mean J3, but a promising 84 % of the estimated J3 are within a factor of 2 from the measured ones. However, when considering detailed daily time evolution, the agreement is typically poor presumably due to uncertainties in estimated growth rates which are required in order to calculate the time-lag between formation of 3-nm and 7-nm particles. At Puijo, the mean and median J7 for clear NPF days during April 2007–December 2015 were 0.23 and 0.07 cm−3 s−1, respectively, while the extrapolated mean and median J3 were 0.47 and 0.13 cm−3 s−1, respectively.

Citation: Baranizadeh, E., Nieminen, T., Yli-Juuti, T., Kulmala, M., Petäjä, T., Leskinen, A., Komppula, M., Laaksonen, A., and Lehtinen, K. E. J.: Estimation of atmospheric particle formation rates through an analytical formula: Validation and application in Hyytiälä and Puijo, Finland, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-916, in review, 2017.
Elham Baranizadeh et al.
Elham Baranizadeh et al.
Elham Baranizadeh et al.

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Short summary
Extrapolating the particle formation rates from one measured larger size (e.g. 7 nm) to smaller sizes (e.g. 3 nm) based on simplified growth-scavenging dynamics works fairly well to estimate mean daily formation rates, but fails to predict the time evolution of the particle population. This points to the challenges in predicting atmospheric nucleation rates for locations where the particle growth and loss rates are size and time-dependent.
Extrapolating the particle formation rates from one measured larger size (e.g. 7 nm) to smaller...
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