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| Salt flux (1) | Sampling (1) | Sand ridges (1) |
| satellite communication (1) | satellite salinity (2) | Satellite telemetry (1) |
| satellite-based ocean monitoring system (1) | Satellites (2) | Satisfaction Relation (1) |
| Science / Environmental Science (1) | science policy and planning (1) | Scotian Shelf (1) |
| sea ice (1) | Sea level (2) | Sea measurements (3) |
| Sea surface (2) | Sea surface temperature (1) | sea surface wind (1) |
| sea-floor (1) | seabed observation (1) | Seafloor energy (1) |
| seafloor geodesy (2) | Seafloor hydrothermal vents (1) | seafloor observatories (2) |
| seafloor observatory (1) | seafloor observatory network (1) | seamounts (1) |
| Seasonal cycle (1) | Seawater temperature (1) | seeps (1) |
| seismic ocean thermometry (1) | Sensible heat flux (1) | sensing (1) |
| sensor (1) | sensor control (1) | sensor networks (1) |
| sensor web (1) | Session Type (1) | Session types (1) |
| ShakeAlert system (1) | shaking intensity (1) | shallow-water (1) |
| shelf (1) | Shelf-break (1) | shelf-interior ocean interactions (1) |
| Shelf-water streamer (1) | shelfbreak front (2) | sierra-negra-volcano (1) |
| smart cable (1) | SMART subsea cables (1) | Software engineering (1) |
| sonar (4) | Southern Ocean (5) | Spatial resolution (1) |
| speckle noise (1) | stand-alone observatory; optoacoustic imaging; ecological monitoring; remote data transmission; Artificial Intelligence (1) | standards and absolute measurements (1) |
| stochastic acoustic prediction (1) | storm categorization (1) | storm-resolving global climate model (1) |
| stratification breakdown (1) | streaming data-analytics (1) | sub-polar North Atlantic (1) |
| Subantarctic Mode Water (1) | submarine cable (1) | submarine communication (1) |
| submarine tectonics and volcanism (1) | submarine telecommunications cables (1) | submarine volcano monitoring (1) |
| submarine volcanoes (2) | submesoscale (1) | subpolar North Atlantic (1) |
| Subsea CO2 seepage (1) | Sulfate reducer (1) | Surface heat fluxes (1) |
| surface mooring (1) | surface radiation (1) | surface vehicle (1) |
| surface waves (1) | surface waves investigation and monitoring (1) | Sustainability (1) |
| sustained observations (1) | SWAN (1) | symmetric instability (1) |
| synoptic meteorology (1) | synthesis (1) | Synthetic aperture radar (2) |
| systemic (1) | | |
