A new flexible multicomponent model for the study of aerosol dynamics in the marine boundary layer



    Corresponding author
    1. Department for Urban Environment and Industry, Norwegian Institute for Air Research, P.O. Box 100, NO-2027 Kjeller, Norway
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    1. Department of Atmospheric Environment, National Environment Research Institute, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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    1. Department of Physical Sciences, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
    2. Department of Technology, Metropolia University of Applied Sciences, P.O. Box 4000, FI-00180 Helsinki, Finland
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    1. Department of Meteorology, Stockholm University, Svante Arrhenius väg 16C, S-10691 Stockholm, Sweden
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e-mail: mka@nilu.no


A new sectional aerosol dynamics model, MAFOR, was developed with the focus to study nucleation in the marine boundary layer. Novel aspects of the model are (1) flexibility in the treatment of gas phase chemistry, (2) treatment of liquid phase chemistry, which can be extended according to needs and (3) simultaneous calculation of number and mass concentration distributions of a multicomponent aerosol as functions of time. Comparison with well-documented aerosol models (MONO32 and AEROFOR), a comprehensive data set on gas phase compounds, aerosol size distribution and chemical composition obtained during the AOE-96 (Arctic Ocean Expedition, 1996) was used to evaluate the model. Dimethyl sulphide decay during advection of an air parcel over the Arctic pack ice was well captured by the applied models and predicted concentrations of gaseous sulphuric acid and methane sulphonic acid range up to 1.0 × 106 cm−3 and 1.8 × 106 cm−3, respectively. Different nucleation schemes were implemented in MAFOR which allow the simulation of new particle formation. Modelled nucleation rates from sulphuric acid nucleation via cluster activation were up to 0.21 cm−3 s−1 while those from ion-mediated nucleation were below 10−2 cm−3 s−1. Classical homogeneous binary and ternary nucleation theories failed to predict nucleation over the central Arctic Ocean in summer.