EPOCA comprises 16 workpackages:

1. Consortium management
2. Past variability of ocean chemistry (paleo-reconstruction)
3. Present-day observations of ocean chemistry and biogeography
4. Sensitivity of calcification
5. Sensitivity of autotrophic processes
6. Performance: reproduction and growth
7. Microbial diversity and activity, in particular nitrogen cycling
8. Impact on trophic interactions
9. From process studies to ecosystem models
10. Future changes in ocean carbonate chemistry
11. Biogeochemical impacts
12. Assessment and Earth system feedbacks
13. Uncertainties, risks and thresholds
14. Dissemination, exploitation and management of knowledge
15. Data management
16. Training