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

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...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2021-04, Vol.21 (8), p.5935-5951
Main Authors: Badeke, Ronny, Matthias, Volker, Grawe, David
Format: Article
Language:English
Subjects:
Air quality
Analysis
Barriers
Chemistry
Cruise ships
Dispersion
Emissions
Exhaust gases
Gas fields
Gases
Harbors
Model testing
Near fields
Parameterization
Plume rise
Pollutants
Prototypes
Ships
Stream pollution
Sulfur content
Transport
Velocity
Vertical distribution
Wind
Wind speed
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Summary: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.
ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-21-5935-2021