References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-9-25799-2009

Factors influencing the contribution of ion-induced nucleation in a boreal forest, Finland

Gagné

¹ Nieminen

¹ Kurtén

¹ ² Manninen

H. E.

¹ Petäjä

¹ Laakso

¹ ³ Kerminen

V.-M.

¹ ⁴ Boy

¹ Kulmala

¹ ⁵

Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland

Dept. of Chemistry, University of Copenhagen, 2100, Denmark

School of Physical and Chemical Sciences, North-West University, Private Bag x6001, Potchefstroom 2520, South Africa

Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland

Department of Applied Environmental Science, Stockholm University, 10691 Stockholm, Sweden

01 12 2009

9 6 25799 25838

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys-discuss.net/9/25799/2009/acpd-9-25799-2009.html

The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/9/25799/2009/acpd-9-25799-2009.pdf

We present the longest series of measurements so far (2 years and 7 months) made with an Ion-DMPS at the SMEAR II measurement station in Hyytiälä, Southern Finland. We show that the classification of overcharged (implying some participation of ion-induced nucleation) and undercharged (implying no or very little participation of ion-induced nucleation) days based on Ion-DMPS measurements agrees with the fraction of ion-induced nucleation based on NAIS measurements. We analyzed the influence of different parameters on the contribution of ion-induced nucleation to the total particle formation rate. We found that the fraction of ion-induced nucleation is typically higher on warmer, drier and sunnier days compared to colder days with less solar radiation and a higher relative humidity. Also, we observed that bigger concentrations of new particles were produced on days with a smaller fraction of ion-induced nucleation. Moreover, sulfuric acid concentrations were smaller for days with a bigger fraction of ion-induced nucleation. Finally, we propose tentative explanations on how these different parameters influence the different nucleation mechanisms, and show that the different mechanisms seem to take place at the same time during an event. The relative contribution of the different mechanisms seems to vary depending on the surrounding conditions.

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