Details
| Original language | English |
|---|---|
| Pages (from-to) | 1403-1422 |
| Number of pages | 20 |
| Journal | Geoscientific model development |
| Volume | 12 |
| Issue number | 4 |
| Early online date | 11 Apr 2019 |
| Publication status | E-pub ahead of print - 11 Apr 2019 |
Abstract
Urban pedestrian-level air quality is a result of an interplay between turbulent dispersion conditions, background concentrations, and heterogeneous local emissions of air pollutants 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 SALSA2.0 into 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 good agreement with measurements, with simulated values mainly within a factor of 2 of observations. 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.
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Earth and Planetary Sciences(all)
- General Earth and Planetary Sciences
Sustainable Development Goals
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In: Geoscientific model development, Vol. 12, No. 4, 11.04.2019, p. 1403-1422.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Implementation of the sectional aerosol module SALSA2.0 into the PALM model system 6.0: model development and first evaluation
AU - Kurppa, Mona
AU - Hellsten, Antti
AU - Roldin, Pontus
AU - Kokkola, Harri
AU - Tonttila, Juha
AU - Auvinen, Mikko
AU - Kent, Christoph
AU - Kumar, Prashant
AU - Maronga, Bjorn
AU - Järvi, Leena
N1 - Funding Information: Acknowledgements. MK acknowledges Sasu Karttunen for technical support and Basit Khan, Farah Kanani-Sühring, Renate Forkel, and Sabine Banzhaf for cooperation, valuable discussions, and model testing. This study was financially supported by the doctoral programme in Atmospheric Sciences (ATM-DP, University of Helsinki), the Helsinki Metropolitan Region Urban Research Program and the Academy of Finland (181255, 277664), the transnational project SMURBS (http://www.smurbs.eu/, last access: 29 March 2019; grant agreement no. 689443), and the Helsinki metropolitan Air Quality Testbed (HAQT).
PY - 2019/4/11
Y1 - 2019/4/11
N2 - Urban pedestrian-level air quality is a result of an interplay between turbulent dispersion conditions, background concentrations, and heterogeneous local emissions of air pollutants 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 SALSA2.0 into 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 good agreement with measurements, with simulated values mainly within a factor of 2 of observations. 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.
AB - Urban pedestrian-level air quality is a result of an interplay between turbulent dispersion conditions, background concentrations, and heterogeneous local emissions of air pollutants 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 SALSA2.0 into 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 good agreement with measurements, with simulated values mainly within a factor of 2 of observations. 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.
UR - http://www.scopus.com/inward/record.url?scp=85064222800&partnerID=8YFLogxK
U2 - 10.5194/gmd-12-1403-2019
DO - 10.5194/gmd-12-1403-2019
M3 - Article
AN - SCOPUS:85064222800
VL - 12
SP - 1403
EP - 1422
JO - Geoscientific model development
JF - Geoscientific model development
SN - 1991-959X
IS - 4
ER -