AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Atmospheric Nanoparticle Growth, Particle Phase Reactions and Particle Phase State
TAINA YLI-JUUTI, Ilona Riipinen, Ulrich Poeschl, Manabu Shiraiwa, Max Planck Institute for Chemistry
Abstract Number: 311 Working Group: Advances in the Physics and Chemistry of New Particle Formation and Growth
Abstract For nanoparticles formed in the atmosphere from the trace gases, growth to larger sizes is the key to survival and to having climatic effects. By now it is known that organic vapors play a crucial role in the atmospheric nanoparticle growth in many environments, however not all of these organic compounds are identified yet. Also, several open questions still remain on the role of particle phase reactions and mass transport limitations in the nanoparticle growth. In this study we combine the approaches from two recently developed models that are used for describing particle growth and particle phase processes in order to gain a more complete picture of the roles of different particle phase processes in nanoparticle growth. MABNAG (Model for acid-base chemistry in nanoparticle growth) couples thermodynamics of acid-base chemistry from E-AIM (Extended Aerosol Inorganics Model) with a traditional dynamic condensation model and takes in to account the non-ideal mixture effects for equilibrium vapor pressures. KM-GAP (Kinetic multi-layer model for gas-particle interactions in aerosols and clouds) on the other hand uses kinetic approach for the condensation and explicitly resolves mass transport and chemical reactions at the surface and within the particle bulk. By merging these two models, MABNAG and KM-GAP, we compare and discuss the influence of particle phase salt formation and oligomerization, particle phase mass transport limitations, and condensation of low-volatile gas phase oxidation products on atmospheric nanoparticle growth.