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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Nov 2011
Review status
A revision of this discussion paper for further review has not been submitted.
In situ study of particle growth in convective eddies of the planetary boundary layer
B. Alföldy1, V. Groma1, E. Börcsök1, A. Nagy2, A. Czitrovszky2, and S. Török1 1Department of Health and Environmental Physics, Hungarian Academy of Sciences KFKI Atomic Energy Research Institute, P.O. Box 49, 1525, Budapest, Hungary
2Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, P.O. Box 49, 1525, Budapest, Hungary
Abstract. A measurement flight was performed by a motorglider equipped with an aerosol size spectrometer and nano-particle counter over a large area in the rural vicinity of Budapest, Hungary. The flight was carried out in the early afternoon under unstable air dynamical conditions in August 2010. These conditions allowed flying in glider mode, with the engine switched off, using thermal lifts for altitude gain. A significant part of the flight was spent in thermals that allow studying how the atmospheric dynamics acts on the particle formation. It was found that hygroscopic growth affects the particle size distribution in the 30–500 nm interval. In the 30–280 nm interval, the growth rate was found to be similar to that of ammonium sulphate particles. Indirect signs of cloud droplet formation were found during cloud cross, as a concentration drop in size bins fallen in the 280–400 nm size range. In three thermal lifts significantly higher ultrafine particle concentration (30 < d < 280 nm) was measured, with decreased average diameter. The results support the supposition that convective eddies in the boundary layer affect the aerosol composition via hygroscopic growth and secondary particle formation.

Citation: Alföldy, B., Groma, V., Börcsök, E., Nagy, A., Czitrovszky, A., and Török, S.: In situ study of particle growth in convective eddies of the planetary boundary layer, Atmos. Meas. Tech. Discuss., 4, 6969-6986, doi:10.5194/amtd-4-6969-2011, 2011.
B. Alföldy et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC C2587: 'Review of the manuscript 'In situ study of particle growth in convective eddies of the planetary boundary layer'', Anonymous Referee #1, 09 Jan 2012 Printer-friendly Version 
RC C2642: 'Review of Alföldy et al.', Anonymous Referee #2, 16 Jan 2012 Printer-friendly Version 
B. Alföldy et al.
B. Alföldy et al.


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