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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 28 Nov 2018

Model description paper | 28 Nov 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).

Implementation of the sectional aerosol module SALSA into the PALM model system 6.0: Model development and first evaluation

Mona Kurppa1, Antti Hellsten2, Pontus Roldin1,3, Harri Kokkola4, Juha Tonttila4, Mikko Auvinen1,2, Christoph Kent5, Prashant Kumar6, Björn Maronga7,8, and Leena Järvi1,9 Mona Kurppa et al.
  • 1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, 00014 Helsinki, Finland
  • 2Finnish Meteorological Institute, 00101 Helsinki, Finland
  • 3Division of Nuclear Physics, Lund University, 22100 Lund, Sweden
  • 4Finnish Meteorological Institute, 70211 Kuopio, Finland
  • 5Department of Meteorology, University of Reading, Reading RG6 6BB, United Kingdom
  • 6Global Centre for Clean Air Research (GCARE), Department of Civil & Environmental Engineering, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 7Leibniz University Hannover, Institute of Meteorology and Climatology, 30419 Hannover, Germany
  • 8Geophysical Institute, University of Bergen, 5020 Bergen, Norway
  • 9Helsinki Institute of Sustainability Science, University of Helsinki, 00014 Helsinki, Finland

Abstract. 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.

Mona Kurppa et al.
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Status: final response (author comments only)
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Mona Kurppa et al.
Data sets

Input data for performing a model evaluation of the sectional aerosol module SALSA embedded to PALM model system 6.0 M. Kurppa

Mona Kurppa et al.
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Short summary
This paper describes the implementation of a sectional aerosol module SALSA to the PALM model system 6.0. The first evaluation study shows excellent agreements with measurements. Furthermore, we show that ignoring dry deposition of aerosol particles can overestimate the aerosol number concentrations by 20 % whereas condensation and dissolutional growth increase the total aerosol mass by over 10 % in this specific urban environment.
This paper describes the implementation of a sectional aerosol module SALSA to the PALM model...