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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 LU ; Kokkola, Harri ; Tonttila, Juha ; Auvinen, Mikko ; Kent, Christoph ; Kumar, Prashant ; Maronga, Bjorn and Järvi, Leena (2019) In Geoscientific Model Development 12(4). p.1403-1422
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geoscientific Model Development
volume
12
issue
4
pages
20 pages
publisher
Copernicus Gesellschaft mbH
external identifiers
  • scopus:85064222800
ISSN
1991-959X
DOI
10.5194/gmd-12-1403-2019
language
English
LU publication?
yes
id
51f01d4d-8e35-41b7-8ebb-b6eb1b88fa83
date added to LUP
2019-04-24 14:41:16
date last changed
2020-10-07 06:25:26
@article{51f01d4d-8e35-41b7-8ebb-b6eb1b88fa83,
  abstract     = {<p>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&amp;thinsp;%, while condensation and dissolutional increase the total mass by over 10&amp;thinsp;%. 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.</p>},
  author       = {Kurppa, Mona and Hellsten, Antti and Roldin, Pontus and Kokkola, Harri and Tonttila, Juha and Auvinen, Mikko and Kent, Christoph and Kumar, Prashant and Maronga, Bjorn and Järvi, Leena},
  issn         = {1991-959X},
  language     = {eng},
  number       = {4},
  pages        = {1403--1422},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Geoscientific Model Development},
  title        = {Implementation of the sectional aerosol module SALSA2.0 into the PALM model system 6.0 : Model development and first evaluation},
  url          = {http://dx.doi.org/10.5194/gmd-12-1403-2019},
  doi          = {10.5194/gmd-12-1403-2019},
  volume       = {12},
  year         = {2019},
}