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Aerosol ageing in an urban plume - implication for climate

Roldin, Pontus LU ; Swietlicki, Erik LU ; Massling, A.; Kristensson, Adam LU ; Löndahl, Jakob LU ; Eriksson, Axel LU ; Pagels, Joakim LU and Gustafsson, S. (2011) In Atmospheric Chemistry and Physics 11(12). p.5897-5915
Abstract
The climate effects downwind of an urban area resulting from gaseous and particulate emissions within the city are as yet inadequately quantified. The aim of this work was to estimate these effects for Malmo city in southern Sweden (population 280 000). The chemical and physical particle properties were simulated with a model for Aerosol Dynamics, gas phase CHEMistry and radiative transfer calculations (ADCHEM) following the trajectory movement from upwind of Malmo, through the urban background environment and finally tens and hundreds of kilometers downwind of Malmo. The model results were evaluated using measurements of the particle number size distribution and chemical composition. The total particle number concentration 50 km (similar... (More)
The climate effects downwind of an urban area resulting from gaseous and particulate emissions within the city are as yet inadequately quantified. The aim of this work was to estimate these effects for Malmo city in southern Sweden (population 280 000). The chemical and physical particle properties were simulated with a model for Aerosol Dynamics, gas phase CHEMistry and radiative transfer calculations (ADCHEM) following the trajectory movement from upwind of Malmo, through the urban background environment and finally tens and hundreds of kilometers downwind of Malmo. The model results were evaluated using measurements of the particle number size distribution and chemical composition. The total particle number concentration 50 km (similar to 3 h) downwind, in the center of the Malmo plume, is about 3700 cm(-3) of which the Malmo contribution is roughly 30%. Condensation of nitric acid, ammonium and to a smaller extent oxidized organic compounds formed from the emissions in Malmo increases the secondary aerosol formation with a maximum of 0.7-0.8 mu gm(-3) 6 to 18 h downwind of Malmo. The secondary mass contribution dominates over the primary soot contribution from Malmo already 3 to 4 h downwind of the emission sources and contributes to an enhanced total surface direct or indirect aerosol shortwave radiative forcing in the center of the urban plume ranging from -0.3 to -3.3 Wm(-2) depending on the distance from Malmo, and the specific cloud properties. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
11
issue
12
pages
5897 - 5915
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000291939800021
  • scopus:79959956309
ISSN
1680-7324
DOI
10.5194/acp-11-5897-2011
project
MERGE
language
English
LU publication?
yes
id
b6b2acd5-194a-4612-80d0-9eac49af2520 (old id 2049325)
date added to LUP
2011-07-26 12:45:37
date last changed
2017-10-08 03:18:53
@article{b6b2acd5-194a-4612-80d0-9eac49af2520,
  abstract     = {The climate effects downwind of an urban area resulting from gaseous and particulate emissions within the city are as yet inadequately quantified. The aim of this work was to estimate these effects for Malmo city in southern Sweden (population 280 000). The chemical and physical particle properties were simulated with a model for Aerosol Dynamics, gas phase CHEMistry and radiative transfer calculations (ADCHEM) following the trajectory movement from upwind of Malmo, through the urban background environment and finally tens and hundreds of kilometers downwind of Malmo. The model results were evaluated using measurements of the particle number size distribution and chemical composition. The total particle number concentration 50 km (similar to 3 h) downwind, in the center of the Malmo plume, is about 3700 cm(-3) of which the Malmo contribution is roughly 30%. Condensation of nitric acid, ammonium and to a smaller extent oxidized organic compounds formed from the emissions in Malmo increases the secondary aerosol formation with a maximum of 0.7-0.8 mu gm(-3) 6 to 18 h downwind of Malmo. The secondary mass contribution dominates over the primary soot contribution from Malmo already 3 to 4 h downwind of the emission sources and contributes to an enhanced total surface direct or indirect aerosol shortwave radiative forcing in the center of the urban plume ranging from -0.3 to -3.3 Wm(-2) depending on the distance from Malmo, and the specific cloud properties.},
  author       = {Roldin, Pontus and Swietlicki, Erik and Massling, A. and Kristensson, Adam and Löndahl, Jakob and Eriksson, Axel and Pagels, Joakim and Gustafsson, S.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {12},
  pages        = {5897--5915},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Aerosol ageing in an urban plume - implication for climate},
  url          = {http://dx.doi.org/10.5194/acp-11-5897-2011},
  volume       = {11},
  year         = {2011},
}