Articles | Volume 15, issue 11
Atmos. Chem. Phys., 15, 6337–6350, 2015
Atmos. Chem. Phys., 15, 6337–6350, 2015

Research article 11 Jun 2015

Research article | 11 Jun 2015

The role of organic condensation on ultrafine particle growth during nucleation events

D. Patoulias1,2, C. Fountoukis2, I. Riipinen3, and S. N. Pandis1,2,4 D. Patoulias et al.
  • 1Department of Chemical Engineering, University of Patras, Patras, Greece
  • 2Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas (FORTH/ICE-HT), Patras, Greece
  • 3Department of Environmental Science and Analytical Chemistry and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 4Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA

Abstract. A new aerosol dynamics model (DMANx) has been developed that simulates aerosol size/composition distribution and includes the condensation of organic vapors on nanoparticles through the implementation of the recently developed volatility basis set framework. Simulations were performed for Hyytiälä (Finland) and Finokalia (Greece), two locations with different organic sources where detailed measurements were available to constrain the new model. We investigate the effect of condensation of organics and chemical aging reactions of secondary organic aerosol (SOA) precursors on ultrafine particle growth and particle number concentration during a typical springtime nucleation event in both locations. This work highlights the importance of the pathways of oxidation of biogenic volatile organic compounds and the production of extremely low volatility organics. At Hyytiälä, organic condensation dominates the growth process of new particles. The low-volatility SOA contributes to particle growth during the early growth stage, but after a few hours most of the growth is due to semi-volatile SOA. At Finokalia, simulations show that organics have a complementary role in new particle growth, contributing 45% to the total mass of new particles. Condensation of organics increases the number concentration of particles that can act as CCN (cloud condensation nuclei) (N100) by 13% at Finokalia and 25% at Hyytiälä during a typical spring day with nucleation. The sensitivity of our results to the surface tension used is discussed.

Short summary
A new aerosol dynamics model (DMANx) describing the organic vapor condensation on nanoparticles based on the volatility basis set framework is used to simulate typical nucleation events in two contrasting environments in Hyytiälä (Finland) and Finokalia (Greece). The role of semivolatile, low, and extremely low volatility organics and the corresponding surface energies is investigated.
Final-revised paper