Preprints
https://doi.org/10.5194/gmd-2021-376
https://doi.org/10.5194/gmd-2021-376
Submitted as: development and technical paper
31 Jan 2022
Submitted as: development and technical paper | 31 Jan 2022
Status: a revised version of this preprint was accepted for the journal GMD and is expected to appear here in due course.

Effects of vertical ship exhaust plume distributions on urban pollutant concentration – a sensitivity study with MITRAS v2.0 and EPISODE-CityChem v1.4

Ronny Badeke1, Volker Matthias1, Matthias Karl1, and David Grawe2 Ronny Badeke et al.
  • 1Hereon Institute of Coastal Environmental Chemistry, Helmholtz-Zentrum Hereon GmbH, 21502 Geesthacht, Germany
  • 2Center for Earth System Research and Sustainability (CEN), Meteorological Institute, Universität Hamburg, 20146 Hamburg, Germany

Abstract. The modeling of ship emissions in port areas involves several uncertainties and approximations. In Eulerian grid models, the vertical distribution of emissions plays a decisive role for the ground-level pollutant concentration. In this study, model results of a microscale model, which takes thermal plume rise and turbulence into account, are derived for the parameterization of vertical ship exhaust plume distributions. This is done considering various meteorological and ship-technical conditions. The influence of three different approximated parameterizations (Gaussian distribution, single cell emission and exponential Gaussian distribution) on the ground-level concentration are then evaluated in a city-scale model. Choosing a Gaussian distribution is particularly suitable for high wind speeds (> 5 m s−1) and a stable atmosphere, while at low wind speeds or unstable atmospheric conditions the plume rise can be more closely approximated by an exponential Gaussian distribution. While Gaussian and exponential Gaussian distributions lead to ground-level concentration maxima close to the source, with single cell emission assumptions the maxima ground-level concentration occurs at a distance of about 1500 m from the source. Particularly high-resolution city-scale studies should therefore consider ship emissions with a suitable Gaussian or exponential Gaussian distribution. From a distance of around 4 km, the selected initial distribution no longer shows significant differences for the pollutant concentration near the ground, therefore model studies with lower resolution can reasonably approximate ship plumes with a single cell emission.

Ronny Badeke et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-376', Anonymous Referee #1, 01 Mar 2022
    • AC1: 'Reply on RC1', Ronny Badeke, 19 Apr 2022
  • RC2: 'Comment on gmd-2021-376', Anonymous Referee #2, 08 Mar 2022
    • AC2: 'Reply on RC2', Ronny Badeke, 19 Apr 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-376', Anonymous Referee #1, 01 Mar 2022
    • AC1: 'Reply on RC1', Ronny Badeke, 19 Apr 2022
  • RC2: 'Comment on gmd-2021-376', Anonymous Referee #2, 08 Mar 2022
    • AC2: 'Reply on RC2', Ronny Badeke, 19 Apr 2022

Ronny Badeke et al.

Ronny Badeke et al.

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Short summary
For air quality modeling studies it is very important to distribute pollutants correctly into the model system. This has not yet been done for shipping pollution in a high detail. We studied the effect of different vertical distributions of shipping pollutants on the urban air quality and derived advanced formulas for it. These formulas take weather conditions and ship-specific parameters like the exhaust gas temperature into account.