EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

The Effects of Anthropogenic Aerosol Emissions from Chile and Mexico in ECHAM-HAMMOZ

Tuuli Miinalainen1, Harri Kokkola2, Kari E. J. Lehtinen1,2, and Thomas Kühn1,2
Tuuli Miinalainen et al.
  • 1Department of Applied Physics, University of Eastern Finland (UEF), Kuopio, Finland
  • 2Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute, Kuopio, Finland

In this research project we studied the climatic effects of anthropogenic aerosol emissions originating from Chile and Mexico. In particular, we studied black carbon (BC), organic carbon (OC) and sulfur dioxide (SO2).

By using aerosol-climate model ECHAM6.3.0-HAM2.3-MOZ1.0, we analyzed how each aerosol species affects the local cloud properties and radiative balance in the atmosphere. As we here are interested in the maximum impact, we simulated each aerosol species with separate model runs. The reference scenario (BASE) was simulated with the full representation of anthropogenic aerosol emissions from the ECLIPSEV6a emission inventory for the year 2015.Then, we constructed otherwise identical scenarios but the anthropogenic aerosol emissions from Chile and Mexico for each aerosol type were removed (NO_BC, NO_OC and NO_SO2). 

The results indicate that for Chile the sulfur emissions seem to have the greatest impact on both cloud condensation nuclei (CCN) and cloud droplet number concentration. This result is plausible since there the SO2 emissions are much higher than BC and OC emissions. For Mexico, the OC emissions had the most notable effect on CCN, but the cloud droplets are more affected by the SO2 emissions. When looking at the radiative properties, we found out that the direct effects were rather minor compared to semi-direct and indirect effects. This indicates that aerosol-cloud interactions have much larger regional effect on radiation than the aerosol direct effect.

How to cite: Miinalainen, T., Kokkola, H., Lehtinen, K. E. J., and Kühn, T.: The Effects of Anthropogenic Aerosol Emissions from Chile and Mexico in ECHAM-HAMMOZ, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-9976,, 2020

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Presentation version 1 – uploaded on 30 Apr 2020
  • CC1: Comment on EGU2020-9976, Greg Kopp, 06 May 2020

    Hi Tuuli, Following up on my spatial-scale question, I was wondering if this would identify culprit cities or even factories contributing to the emissions causing changes. I suspect not -- those ROI are large, and using the 2x2 deg subsamples probably doesn't give you the needed S/N...

    Nice work, thanks! Greg

    • AC1: Reply to CC1, Tuuli Miinalainen, 06 May 2020

      Excellent point Greg! (And apologies for misspelling your name during chat conversation, such a hurry...) Yes you are totally correct, the standard resolution for our simulations (T63, ~2'x2') is rather coarse if one aims to analyze the impacts of a single point source. Therefore, we focused more on analysing the maximum effect that Chilean and Mexican aerosol emissions produce to the near-by region, modeling BC, OC and SO2 separately.

      • CC2: Reply to AC1, Greg Kopp, 06 May 2020

        No worries on the typo, Tuuli, and thanks for the answer!