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MISU seminar | Tinja Olenius

New particle formation: What do we know and what is to be resolved

by Tinja Olenius
Department of Environmental Science and Analythical Chemistry ACES, Stockholm University

Time: 13 November 2018, 11h15–12h15
Venue: Rossbysalen C609, Arrhenius Laboratory, 6th floor

Abstract
Formation of aerosol particles through gas-to-particle conversion, also referred to as new particle formation (NPF), is a frequently occurring phenomenon in the atmosphere. Although primary particles emitted to the atmosphere directly as particulate matter, such as dust or sea salt, often dominate the aerosol mass, secondary particles originating from vapors make a substantial contribution to the particle number. NPF modifies the ambient particle size distribution: the larger the fraction of particles formed through NPF, generally the smaller the average size and the larger the surface-to-volume ratio of the particles. This affects aerosol impacts on clouds and climate, as they are strongly dependent on particle size and composition.

This seminar gives an overview of the main methods applied to study NPF, and summarizes the current best understanding of the phenomenon as well as the most critical knowledge gaps. The focus is on the very initial steps involving the formation of nanoparticles of a few nanometers in diameter.

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