Oceanographic research vessels. Outside CII scope; per-science-day intensity is the benchmark used by the International Research Ship Operators (IRSO).
Formula
$$ \text{CO}2^\text{year} = \sum_j F_j \cdot C{f,j} $$
$$ \text{Intensity} = \frac{\text{CO}2^\text{year}}{d\text{sci}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_j$ | Mass of fuel $j$ | t | bunker log |
| $C_{f,j}$ | CO₂ factor | t CO₂ / t fuel | MEPC.364(79) |
| $Bench (Science days / year)$ | operational benchmark | d | operations log |
| $d_\text{op}$ | Operating days | d | operations log |
Diesel-electric is standard. Newer vessels (Sikuliaq, RV Polarstern II) design for low underwater radiated noise AND low CO₂, often using silent-DP modes.
Sources
- IRSO - International Research Ship Operators.
- IMO MEPC.364(79) - Cf conversion factors.