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Portrait of Joakim Pagels

Joakim Pagels

Senior Lecturer

Portrait of Joakim Pagels

Aerosol ageing in an urban plume - implication for climate


  • Pontus Roldin
  • Erik Swietlicki
  • A. Massling
  • Adam Kristensson
  • Jakob Löndahl
  • Axel Eriksson
  • Joakim Pagels
  • S. Gustafsson

Summary, in English

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.


  • Nuclear physics
  • Ergonomics and Aerosol Technology
  • MERGE: ModElling the Regional and Global Earth system

Publishing year







Atmospheric Chemistry and Physics





Document type

Journal article


Copernicus GmbH


  • Production Engineering, Human Work Science and Ergonomics
  • Subatomic Physics




  • ISSN: 1680-7324