Atmos. Chem. Phys. Discuss., 9, 26735-26776, 2009
www.atmos-chem-phys-discuss.net/9/26735/2009/
doi:10.5194/acpd-9-26735-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Modeling the regional impact of ship emissions on NOx and ozone levels over the Eastern Atlantic and Western Europe using ship plume parameterization
P. Huszar1, D. Cariolle2,3, R. Paoli3, T. Halenka1,4, M. Belda1, H. Schlager5, J. Miksovsky1, and P. Pisoft1
1Department of Meteorology and Environment Protection, Faculty of Mathematics and Physics, Charles University, Prague, V Holešovičkách 2, Prague 8, 180 00, Czech Republic
2Centre Europeén de Recherche et de Formation Avancée en Calcul Scientifique, CERFACS/CNRS, Toulouse, France
3Météo-France, Toulouse, France
4Regular associate of the Abdus Salam ICTP, Trieste, Italy
5German Aerospace Center, Institute of Atmospheric Physics, Oberpfaffenhofen-Wessling, Germany

Abstract. In general, regional and global chemistry transport models apply instantaneous mixing of emissions into the model's finest resolved scale. In case of a concentrated source, this could result in erroneous calculation of the evolution of both primary and secondary chemical species. Several studies discussed this issue in connection with emissions from ships and aircrafts. In this study, we present an approach to deal with the non-linear effects during dispersion of NOx emissions from ships. It represents an adaptation of the original approach developed for aircraft NOx emissions, which uses an exhaust tracer to trace the amount of the emitted species in the plume and applies an effective reaction rate for the ozone production/destruction during the plume's dilution into the background air. In accordance with previous studies examining the impact of international shipping on the composition of the troposphere, we found that the contribution of ship induced surface NOx to the total reaches 90% over remote ocean and makes 10–30% near coastal regions. Due to ship emissions, surface ozone increases by up to 4–6 ppbv making 10% contribution to the surface ozone budget. When applying the ship plume parameterization, we showed that the large scale NOx decreases and the ship NOx contribution is reduced by up to 20–25%. Similar decrease was found in case of O3. The plume parameterization suppressed the ship induced ozone production by 15–30% over large areas of the focused region. To evaluate the presented parameterization, nitrogen oxide measurements over the English Channel were compared with modeled values and it was found that after activating the parameterization the model accuracy increases.

Citation: Huszar, P., Cariolle, D., Paoli, R., Halenka, T., Belda, M., Schlager, H., Miksovsky, J., and Pisoft, P.: Modeling the regional impact of ship emissions on NOx and ozone levels over the Eastern Atlantic and Western Europe using ship plume parameterization, Atmos. Chem. Phys. Discuss., 9, 26735-26776, doi:10.5194/acpd-9-26735-2009, 2009.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share