Atmos. Chem. Phys. Discuss., 9, 11699-11751, 2009
www.atmos-chem-phys-discuss.net/9/11699/2009/
doi:10.5194/acpd-9-11699-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Investigation of ship-plume chemistry using a newly-developed photochemical ship-plume model
H. S. Kim, R. S. Park, and C. H. Song
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea

Abstract. A photochemical ship-plume model, which can consider the ship-plume dynamics and ship-plume chemistry, simultaneously, was developed to gain a better understanding of atmospheric impact of ship emissions. The model performance was then evaluated by a comparison with the observation data measured on a NOAA WP-3D flight during the Intercontinental Transport and Chemical Transformation 2002 (ITCT 2K2) airborne field campaign. The simulation conditions and parameters, such as meteorological conditions, emission rates, and background gas and particulate species concentrations, were obtained directly and/or inferred indirectly from the ITCT 2K2 observation data. The model-predicted concentrations showed good agreement with the observed concentrations of five ambient species (NOx, NOy, O3, HNO3, and H2SO4) at the eight plume transects by the WP-3D flight with strong correlations around the 1:1 line (0.66≤R≤0.85). In addition, a set of tests were carried out to approximate the magnitude of the reaction probability of HNO3 onto sea-salt particles in the model-observation comparison framework. These results suggest that the reaction probability of HNO3 onto sea-salt particles may be in the order of 10−3 or smaller. The equivalent NOx lifetime throughout the "entire" plume was also estimated from ship-plume chemistry modeling. The NOx lifetimes estimated throughout the "entire ship plume" was 3.36 h. The short NOx lifetime over the entire ship plume clearly shows that the ship-plume chemistry shortens the NOx lifetime considerably. Therefore, the ship-plume chemistry model should be used to model the changes in ship-plume chemical compositions and better evaluate the atmospheric impact of ocean-going ship emissions.

Citation: Kim, H. S., Park, R. S., and Song, C. H.: Investigation of ship-plume chemistry using a newly-developed photochemical ship-plume model, Atmos. Chem. Phys. Discuss., 9, 11699-11751, doi:10.5194/acpd-9-11699-2009, 2009.
 
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