Abstract
Abstract. Estimating the impact of ship emissions on local air quality is a
topic of high relevance, especially in large harbor 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 microscale chemistry, 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.
Funder
Deutsche Forschungsgemeinschaft
Cited by
12 articles.
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