BOOS is an association of 23 oceanographic institutes and centers working on operational oceanography in 9 Baltic Sea countries. Major BOOS collaboration activities are volunteer-based and carried out in a form of working groups (WGs, Fig. 1). In addition, the collaborations are also boosted by joint research projects with external funding e.g. from EU Framework Programme, Interreg and ESA. The modelling collaboration consists of 6 WGs, i.e., coastal sea modelling, ocean model NEMO-Nordic, data assimilation, multi-model ensemble (MME) forecasting, calibration and validation (cal/val) of operational models, marine plastics, which are coordinated by BOOS Modelling Program. In addition, there are 4 WGs working on data management and observations, i.e., real-time sea level exchange, ship data near real time delivery, riverine data sharing and collection, Argo and glider monitoring, and one working group on maintaining BOOS website.
A summary of BOOS Working Groups
| Work Group (WG) | Leading person/partner | Partners | |
| Argo & Glider WG | Laura Tuomi | FMI, GU, IO PAN, IOW, SMHI, TalTech, VOTO | |
| Coastal Modelling WG | Jens Murawski | DMI, AU, BSH, KU, HEREON, IOPAN, SMHI, SYKE, UL | |
| Data Assimilation WG | Jun She | DMI, AWI, BSH, FMI, SMHI, TalTech | |
| Marine Plastic WG | Jun She | DMI, BSH, HEREON, IMGW, SYKE, TalTech, UL | |
| Multi-Model Ensemble WG | Tabea Rebekka Panteleit | BSH, DMI, FMI, GEOMETOC, IOPAN, SMHI, TalTech | |
| River Data WG | Patrick Gorringe | SMHI, +Atlantic, BSH, DMI, IMGW, SYKE, TalTech, UL | |
| Real-Time ship data exchange WG | Johanna Linders | SMHI, BSH, DMI, FMI, IOW, IOPAN, SYKE, TalTech | |
| Cal/Val WG | Simon Jandt-Scheelke | BSH, DMI, FMI, GEOMETOC, SMHI, TalTech, UG | |
| NEMO-Nordic WG | Joanna Staneva | HEREON, BSH, DMI, FMI, SMHI, SYKE, TalTech | |
| Operational Sea level Data Exchange WG | Thorger Brüning, Vibeke Huess | DMI, BSH, EMI, EPA, FMI, IMGW, LEGMC, SMHI, SMA, TalTech | |
| Machine Learning WG | Jian Su | DMI, FMI, HEREON, IOPAN, TalTech (TBC) | |
| Remote Sensing WG | Miraslow Darecki | IOPAN, BSH, DMI (TBC), EMI (TBC), FMI (TBC), SYKE (TBC), KU, EPA |
