References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-11-5897-2011

Aerosol ageing in an urban plume – implication for climate

Roldin

¹ Swietlicki

¹ Massling

¹ ⁴ Kristensson

¹ Löndahl

¹ Eriksson

¹ ² Pagels

² Gustafsson

Division of Nuclear Physics, Lund University, 221 00, Lund, Sweden

Division of Ergonomics and Aerosol Technology, Lund University, Sweden

Environmental Department, City of Malmö, Sweden

now at: National Environmental Research Institute, Dept. of Atmospheric Environment, Aarhus University, Denmark

22 06 2011

11 12 5897 5915

2011

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/11/5897/2011/acp-11-5897-2011.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/11/5897/2011/acp-11-5897-2011.pdf

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 Malmö 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 Malmö, through the urban background environment and finally tens and hundreds of kilometers downwind of Malmö. The model results were evaluated using measurements of the particle number size distribution and chemical composition. The total particle number concentration 50 km (~ 3 h) downwind, in the center of the Malmö plume, is about 3700 cm−3 of which the Malmö contribution is roughly 30%. Condensation of nitric acid, ammonium and to a smaller extent oxidized organic compounds formed from the emissions in Malmö increases the secondary aerosol formation with a maximum of 0.7–0.8 μg m−3 6 to 18 h downwind of Malmö. The secondary mass contribution dominates over the primary soot contribution from Malmö 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 W m−2 depending on the distance from Malmö, and the specific cloud properties.

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