Exploring the potential of nano-Köhler theory to describe the growth of atmospheric molecular clusters by organic vapors using cluster kinetics simulations

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Kontkanen , J , Olenius , T , Kulmala , M & Riipinen , I 2018 , ' Exploring the potential of nano-Köhler theory to describe the growth of atmospheric molecular clusters by organic vapors using cluster kinetics simulations ' , Atmospheric Chemistry and Physics , vol. 18 , no. 18 , pp. 13733-13754 . https://doi.org/10.5194/acp-18-13733-2018

Title: Exploring the potential of nano-Köhler theory to describe the growth of atmospheric molecular clusters by organic vapors using cluster kinetics simulations
Author: Kontkanen, Jenni; Olenius, Tinja; Kulmala, Markku; Riipinen, Ilona
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Stockholm University
Date: 2018-09-27
Language: eng
Number of pages: 22
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/276978
Abstract: Atmospheric new particle formation (NPF) occurs by the formation of nanometer-sized molecular clusters and their subsequent growth to larger particles. NPF involving sulfuric acid, bases and oxidized organic compounds is an important source of atmospheric aerosol particles. One of the mechanisms suggested to depict this process is nano-Kohler theory, which describes the activation of inorganic molecular clusters to growth by a soluble organic vapor. In this work, we studied the capability of nano-Kohler theory to describe the initial growth of atmospheric molecular clusters by simulating the dynamics of a cluster population in the presence of a sulfuric acid-base mixture and an organic compound. We observed nano-Kohler-type activation in our simulations when the saturation ratio of the organic vapor and the ratio between organic and inorganic vapor concentrations were in a suitable range. However, nano-Kohler theory was unable to predict the exact size at which the activation occurred in the simulations. In some conditions, apparent cluster growth rate (GR) started to increase close to the activation size determined from the simulations. Nevertheless, because the behavior of GR is also affected by other dynamic processes, GR alone cannot be used to deduce the cluster growth mechanism.
Subject: PARTICLE FORMATION
SULFURIC-ACID
AEROSOL NUCLEATION
FORMATION RATES
DIMETHYLAMINE
NUCLEI
SIZE
NANOPARTICLES
ACTIVATION
AMMONIA
1172 Environmental sciences
114 Physical sciences
116 Chemical sciences
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