Percentage deviation of a ship’s AER from the Poseidon Principles decarbonisation trajectory.
Formula
$$ \text{Alignment} = \left(\frac{\text{AER}\text{trajectory} - \text{AER}\text{attained}}{\text{AER}_\text{trajectory}}\right) \times 100 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\text{AER}_\text{attained}$ | Ship’s Attained AER | g CO₂ / (dwt·nm) | IMO DCS |
| $\text{AER}_\text{trajectory}$ | Trajectory AER for ship type / size / year | g CO₂ / (dwt·nm) | Poseidon Principles Secretariat |
Positive = aligned; negative = lagging. Banks report portfolio-weighted alignment annually.
Sources
- Poseidon Principles - signatories’ portal.
- IMO Resolution MEPC.336(76) - AER / CII framework.