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We carried out column model simulations to study particle fluxes anddeposition and to evaluate different particle formation mechanisms ata boreal forest site in Finland. We show that kinetic nucleation ofsulphuric acid cannot be responsible for new particle formation aloneas the simulated vertical profile of particle number concentrationdoes not correspond to observations. Instead organic inducednucleation leads to good agreement confirming the relevance of theaerosol formation mechanism including organic compounds emitted by thebiosphere.  The simulation of aerosol concentration within the atmosphericboundary layer during nucleation event days shows a highly dynamicalpicture, where particle formation is coupled with chemistry andturbulent transport. We have demonstrated the suitability of ourturbulent mixing scheme in reproducing the most importantcharacteristics of particle dynamics within the boundarylayer. Deposition and particle flux simulations show that depositionaffects noticeably only the smallest particles in the lowest part ofthe atmospheric boundary layer

Particle concentration and flux dynamics in the atmospheric boundary layer as the indicator of formation mechanism