Atmos. Chem. Phys. Discuss., 9, 8587-8618, 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.
The impact of resolution on ship plume simulations with NOx chemistry
C. L. Charlton-Perez1,2, M. J. Evans1, J. H. Marsham1, and J. G. Esler2
1Institute for Atmospheric Science, The School of the Environment, University of Leeds, Leeds, UK
2Department of Mathematics, University College London, London, UK

Abstract. A high resolution chemical transport model of the marine boundary layer is designed in order to investigate the detailed chemical evolution of a ship plume. To estimate systematic errors due to finite model resolution, otherwise identical simulations are run at a range of model resolutions. Notably, to obtain comparable plumes in the different simulations, it is found necessary to use an advection scheme consistent with the Large Eddy Model representation of sub-grid winds for those simulations with degraded resolution. Our simulations show that OH concentration, NOx lifetime and ozone production efficiency of the model change by 8%, 32% and 31% respectively between the highest (200 mx200 mx40 m) and lowest resolution (9600 mx9600 mx1920 m) simulations. Interpolating to the resolution of a typical global composition transport model (CTM, 5°x5°), suggests that a CTM overestimates OH, NOx lifetime and ozone production efficiency by approximately 15%, 55% and 59% respectively. For the first time, it is shown explicitly that the reduction in model skill is due to the coarse resolution of these CTMs and the non-linear nature of atmospheric chemistry. These results are significant for the assessment and forecasting of the climate impact of ship NOx and indicate that for realistic representation of ship plume emissions in CTMs, some suitable parametrisation is necessary at current global model resolutions.

Citation: Charlton-Perez, C. L., Evans, M. J., Marsham, J. H., and Esler, J. G.: The impact of resolution on ship plume simulations with NOx chemistry, Atmos. Chem. Phys. Discuss., 9, 8587-8618, doi:10.5194/acpd-9-8587-2009, 2009.
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