ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-2641-2012 Extension of an assessment model of ship traffic exhaust emissions for particulate matter and carbon monoxide Jalkanen J.-P. 1 Johansson L. 1 Kukkonen J. 1 Brink A. 2 Kalli J. 3 Stipa T. 1 Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland Åbo Akademi, Process Chemistry Center (CMC), Tuomiokirkontori 3, 20500 Turku, Finland University of Turku, Centre for Maritime Studies, P.O. Box 181, 28101 Pori, Finland 12 03 2012 12 5 2641 2659 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/2641/2012/acp-12-2641-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/2641/2012/acp-12-2641-2012.pdf

A method is presented for the evaluation of the exhaust emissions of marine traffic, based on the messages provided by the Automatic Identification System (AIS), which enable the positioning of ship emissions with a high spatial resolution (typically a few tens of metres). The model also takes into account the detailed technical data of each individual vessel. The previously developed model was applicable for evaluating the emissions of NO<sub>x</sub>, SO<sub>x</sub> and CO<sub>2</sub>. This paper addresses a substantial extension of the modelling system, to allow also for the mass-based emissions of particulate matter (PM) and carbon monoxide (CO). The presented Ship Traffic Emissions Assessment Model (STEAM2) allows for the influences of accurate travel routes and ship speed, engine load, fuel sulphur content, multiengine setups, abatement methods and waves. We address in particular the modeling of the influence on the emissions of both engine load and the sulphur content of the fuel. The presented methodology can be used to evaluate the total PM emissions, and those of organic carbon, elemental carbon, ash and hydrated sulphate. We have evaluated the performance of the extended model against available experimental data on engine power, fuel consumption and the composition-resolved emissions of PM. We have also compared the annually averaged emission values with those of the corresponding EMEP inventory, As example results, the geographical distributions of the emissions of PM and CO are presented for the marine regions of the Baltic Sea surrounding the Danish Straits.

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