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https://doi.org/10.5194/acp-2020-753
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-753
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Sep 2020

01 Sep 2020

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This preprint is currently under review for the journal ACP.

Parameterizing the vertical downward dispersion of ship exhaust gas in the near-field

Ronny Badeke1, Volker Matthias1, and David Grawe2 Ronny Badeke et al.
  • 1Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
  • 2Center for Earth System Research and Sustainability (CEN); Meteorological Institute, Universität Hamburg, 20146 Hamburg, Germany

Abstract. Estimating the impact of ship emissions on local air quality is a topic of high relevance, especially in large harbour cities. For chemistry transport modeling studies, the initial plume rise and dispersion play a crucial role for the distribution of pollutants into vertical model layers. This study aims at parameterizing the vertical downward dispersion in the near-field of a prototype cruise ship, depending on several meteorological and technical input parameters. By using the micro-scale transport and stream model MITRAS, a parameterization scheme was developed to calculate the downward dispersion, i.e. the fraction of emissions, which will be dispersed below stack height. This represents the local concentration in the vicinity of the ship. Cases with and without considering the obstacle effect of the ship have been compared. Wind speed and ship size were found to be the strongest factors influencing the downward dispersion, which can reach values up to 55 % at high wind speed and lateral wind. This compares to 31 % in the case where the obstacle effect was not considered and shows the importance of obstacle effects when assessing the ground-level pollution situation in ports.

Ronny Badeke et al.

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Ronny Badeke et al.

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Short summary
This work aims to describe the physical distribution of ship exhaust gases in the near-field, e.g. inside of a harbor. Results were calculated with a mathematical model for different meteorological and technical conditions. It has been shown that large vessels like cruise ships have a significant effect of up to 55 % downward movement of exhaust gas, as they can disturb the ground-near wind circulation. This needs to be considered in urban air pollution studies.
This work aims to describe the physical distribution of ship exhaust gases in the near-field,...
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