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Icebreaker Fuel & CO₂

Polar and Baltic icebreakers. Outside CII scope (operations vary wildly with ice thickness). Per-operating-day intensity is the most stable benchmark.

Ship typeWork boatIcebreaker
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Formula, assumptions, and limits

CO2year=jFjCf,j\text{CO}_2^\text{year} = \sum_j F_j \cdot C_{f,j}
SymbolMeaningUnit
FjF_jMass of fuel jjt
Cf,jC_{f,j}CO₂ factort CO₂ / t fuel
Bench(Operatingdays/year)Bench (Operating days / year)operational benchmarkd
dopd_\text{op}Operating daysd

Source: IMO Polar Code (MEPC.264(68)); IMO MEPC.364(79) - Cf conversion factors