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https://doi.org/10.5194/acp-2020-531
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-531
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Jun 2020

23 Jun 2020

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This preprint is currently under review for the journal ACP.

Weaker cooling by aerosols due to dust-pollution interactions

Klaus Klingmüller1, Vlassis A. Karydis2, Sara Bacer3, Georgiy L. Stenchikov4, and Jos Lelieveld1,5 Klaus Klingmüller et al.
  • 1Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany
  • 2Forschungszentrum Jülich GmbH, IEK-8, 52425 Jülich, Germany
  • 3LEGI, Université Grenoble Alpes, CNRS, Grenoble INP, Grenoble, France
  • 4King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
  • 5The Cyprus Institute, P.O. Box 27456, 1645 Nicosia, Cyprus

Abstract. The interactions between aeolian dust and anthropogenic air pollution, notably chemical ageing of mineral dust and coagulation of dust and pollution particles, modify the atmospheric aerosol composition and burden. Since the aerosol particles can act as cloud condensation nuclei, this not only affects the radiative transfer directly via aerosol-radiation interactions, but also indirectly through cloud adjustments. We study both radiative effects using the global ECHAM/MESSy atmospheric chemistry-climate model (EMAC) which combines the Modular Earth Submodel System (MESSy) with the European Centre/Hamburg (ECHAM) climate model. Our simulations show that dust-pollution interactions reduce the cloud water path and hence the reflection of solar radiation. The associated climate warming outweighs the cooling which the dust-pollution interactions exert through the direct radiative effect. In total, this results in a net warming by dust-pollution interactions which moderates the negative global anthropogenic aerosol forcing at the top of the atmosphere by (0.2 ± 0.1) W m−2.

Klaus Klingmüller et al.

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Klaus Klingmüller et al.

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Latest update: 29 Sep 2020
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Short summary
Particulate air pollution cools the climate and partially masks the greenhouse warming by reflecting sunlight and enhancing the reflection by clouds. The intensity of this cooling depends on interactions between pollution and desert dust within the atmosphere. Our simulations with a global atmospheric chemistry-climate model indicate that these interactions significantly weaken the cooling.
Particulate air pollution cools the climate and partially masks the greenhouse warming by...
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