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Implementation of the sectional aerosol module SALSA2.0 into the PALM model system 6.0: model development and first evaluation

Kurppa, Mona, Hellsten, Antti, Roldin, Pontus, Kokkola, Harri, Tonttila, Juha, Auvinen, Mikko, Kent, Christoph, Kumar, Prashant, Maronga, Björn and Järvi, Leena (2018) Implementation of the sectional aerosol module SALSA2.0 into the PALM model system 6.0: model development and first evaluation Geoscientific Model Development Discussions, 12 (4). pp. 1403-1422.

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Urban pedestrian-level air quality is a result of an interplay between turbulent dispersion conditions, background concentrations and heterogeneous local emissions of air pollutant and their transformation processes. Still, the complexity of these interactions cannot be resolved by the commonly used air quality models. By embedding the sectional aerosol module SALSA to the large-eddy simulation model PALM, a novel, high-resolution, urban aerosol modelling framework has been developed. The first model evaluation study on the vertical variation of aerosol number concentration and size distribution in a simple street canyon without vegetation in Cambridge, UK, shows excellent agreement with measurements. Dispersion conditions and local emissions govern the pedestrian-level aerosol number concentrations. Out of different aerosol processes, dry deposition is shown to decrease the total number concentration by over 20%, while condensation and dissolutional increase the total mass by over 10%. Following the model development, the application of PALM can be extended to local- and neighbourhood-scale air pollution and aerosol studies that require a detailed solution of the ambient flow field.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Kurppa, Mona
Hellsten, Antti
Roldin, Pontus
Kokkola, Harri
Tonttila, Juha
Auvinen, Mikko
Kent, Christoph
Maronga, Björn
Järvi, Leena
Date : 28 November 2018
DOI : 10.5194/gmd-12-1403-2019
Copyright Disclaimer : © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
Depositing User : Melanie Hughes
Date Deposited : 04 Dec 2018 15:21
Last Modified : 09 May 2019 10:39

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