Atmos. Chem. Phys. Discuss., 10, 30691-30729, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
South African EUCAARI – measurements: a site with high atmospheric variability
L. Laakso1,2,9, V. Vakkari2, H. Laakso2, A. Virkkula2, M. Kulmala2, J. P. Beukes1, P. G. van Zyl1, J. J. Pienaar1, K. Chiloane3, S. Gilardoni4, E. Vignati4, A. Wiedensohler5, T. Tuch5, W. Birmili5, S. Piketh6, K. Collett6, G. D. Fourie7, M. Komppula8, H. Lihavainen9, G. de Leeuw9,10, and V.-M. Kerminen2,9
1School of Physical and Chemical Sciences, North-West University, Potchefstroom, South Africa
2Department of Physics, University of Helsinki, Finland
3ESKOM, Sustainability and Innovation, Environmental Sciences Department, South Africa
4Climate Change Unit, European Commission DG JRC, Ispra, Italy
5Leibniz Institute for Tropospheric Research, Leipzig, Germany
6Climatology Research Group, University of the Witwatersrand, Johannesburg, South Africa
7Sasol Technology, Research and Development, Sasolburg, South Africa
8Finnish Meteorological Institute, Kuopio, Finland
9Finnish Meteorological Institute, Helsinki, Finland
10TNO, Utrecht, The Netherlands

Abstract. In this paper, new long-term measurements of chemical composition and physical properties of atmospheric aerosols carried out on the eastern brink of the heavily polluted Highveld area in South Africa are introduced. As expected, a high variability of aerosol properties was observed. Optical properties of aerosol particles were found to be closely correlated with particulate mass and number concentration in the case of polluted air masses. In contrast, in clean conditions there was no clear connection between optical properties and aerosol number concentration due to the presence of multiple sources including new particle formation.

Citation: Laakso, L., Vakkari, V., Laakso, H., Virkkula, A., Kulmala, M., Beukes, J. P., van Zyl, P. G., Pienaar, J. J., Chiloane, K., Gilardoni, S., Vignati, E., Wiedensohler, A., Tuch, T., Birmili, W., Piketh, S., Collett, K., Fourie, G. D., Komppula, M., Lihavainen, H., de Leeuw, G., and Kerminen, V.-M.: South African EUCAARI – measurements: a site with high atmospheric variability, Atmos. Chem. Phys. Discuss., 10, 30691-30729, doi:10.5194/acpd-10-30691-2010, 2010.
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