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Discussion papers
https://doi.org/10.5194/acp-2016-556
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-2016-556
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 18 Jul 2016

Submitted as: research article | 18 Jul 2016

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This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.

Vertical and horizontal variation of aerosol number size distribution in the boreal environment

Riikka Väänänen1, Radovan Krejci2,1, Hanna E. Manninen1, Antti Manninen1, Janne Lampilahti1, Stephany Buenrostro Mazon1, Tuomo Nieminen3,1, Taina Yli-Juuti3,1, Jenni Kontkanen1, Ari Asmi1, Pasi P. Aalto1, Petri Keronen1, Toivo Pohja1,4, Ewan O'Connor5, Veli-Matti Kerminen1, Tuukka Petäjä1, and Markku Kulmala1 Riikka Väänänen et al.
  • 1Department of Physics , P.O. Box 64, FI-00014 University of Helsinki, Finland
  • 2Stockholm University, Department of Environmental Science and Analytical Chemistry & Bolin Centre for Climate Research, SE-10691 Stockholm, Sweden
  • 3Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
  • 4SMEAR II measurement station, Hyytiäläntie 124, 35500 Korkeakoski, Finland
  • 5Finnish Meteorological Institute, P.O. BOX 503, FI-00101 Helsinki, Finland

Abstract. This study explores the vertical and horizontal variability of the particle number size distribution from two flight measurements campaigns over a boreal forest in Hyytiälä, Finland during May–June 2013 and March–April 2014, respectively. Our other aims were to study the spatial extent of new particle formation events and to compare the airborne observation with the ground measurements from the SMEAR II (Station for Measuring Ecosystem-Atmosphere Relations) field station located in Hyytiälä. The airborne measurements extended vertically 3.8 km and horizontally 30 km from the station. A Cessna 172 aircraft was used as a measurement platform. The measured parameters included the particle number concentration (> 3 nm) and particle number size distribution (10–400 nm). The airborne data used in this study were equal to 111 flight hours. The measurements showed that despite local fluctuations there was a good agreement between the on-ground and airborne measurements inside the planetary boundary layer. On median, the airborne total number concentration was found to be 10 % larger than at the ground level. The seasonal and meteorological differences between the campaigns were reflected in aerosol properties. NPF days showed areas of intensified NPF on a scale from kilometres up to couple of tens of kilometres in the planetary boundary layer. NPF was also observed frequently in the free troposphere.

Riikka Väänänen et al.
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Riikka Väänänen et al.
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Short summary
A light aircraft was used as a platform to explore the horizontal and vertical variability of the aerosol particles over a boreal forest in Central Finland. This information is needed when data measured at ground level station is extrapolated and parameterized to represent the conditions of the larger scale. The measurements showed that despite local fluctuations there was a good agreement between the on-ground and airborne measurements inside the planetary boundary layer.
A light aircraft was used as a platform to explore the horizontal and vertical variability of...
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