Articles | Volume 10, issue 9
Atmos. Chem. Phys., 10, 4319–4330, 2010
https://doi.org/10.5194/acp-10-4319-2010

Special issue: European Integrated Project on Aerosol-Cloud-Climate and Air...

Atmos. Chem. Phys., 10, 4319–4330, 2010
https://doi.org/10.5194/acp-10-4319-2010

  07 May 2010

07 May 2010

Observations of turbulence-induced new particle formation in the residual layer

B. Wehner1, H. Siebert1, A. Ansmann1, F. Ditas1, P. Seifert1, F. Stratmann1, A. Wiedensohler1, A. Apituley2, R. A. Shaw1,3, H. E. Manninen4, and M. Kulmala4 B. Wehner et al.
  • 1Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
  • 2RIVM – National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
  • 3Department of Physics, Michigan Technological University, Houghton, MI 49931, USA
  • 4Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland

Abstract. Aerosol particle measurements in the atmospheric boundary layer performed by a helicopter-borne measurement payload and by a lidar system from a case study during the IMPACT field campaign in Cabauw (NL) are presented. Layers of increased number concentrations of ultrafine particles were observed in the residual layer, indicating relatively recent new-particle formation. These layers were characterized by a sub-critical Richardson number and concomitant increased turbulence. Turbulent mixing is likely to lead to local supersaturation of possible precursor gases which are essential for new particle formation. Observed peaks in the number concentrations of ultrafine particles at ground level are connected to the new particle formation in the residual layer by boundary layer development and vertical mixing.

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