The Carbon Intensity Indicator (CII) regulation came into force in 2023 with the objective of reducing greenhouse gas emissions in the maritime industry. Ice-classed vessels sailing in ice have been granted a voyage adjustment in the CII regulation. The voyage adjustment allows ice-classed vessels to exclude from the calculation of CII the part of any voyage that constitutes sailing in ice. The current study examines a sensitivity analysis of definitions for sailing in ice conditions. Sailing in ice is defined in the current regulation as an ice-classed vessel operating in a sea area within the ice edge. Alternative definitions have been considered which are more specific in terms of concentration and thickness of the ice field where the vessel operates. We present a case study of a conventional diesel-powered bulk carrier with ice class IA Super on a voyage in the Canadian Arctic. Routing of the vessel is optimized based on an assumed rewards function, a routing algorithm, and a ship performance model. We compare the routes selected under different definitions of “sailing in ice conditions”. The results show that different definitions of sailing in ice conditions lead to different optimal routes for the vessel, some of which are more effective than others in meeting the IMO’s strategic objective of reducing emissions.
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Tran et al. (2024) studied this question.
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