NOAA Global RTOFS: 8-Day Ocean Forecasts with 1/12° Resolution

NOAA's Global Real-Time Ocean Forecast System (Global RTOFS) provides nowcasts and eight-day forecasts of ocean conditions. The system uses a 1/12° global HYCOM model coupled to a sea ice model, with a 24-hour data assimilation cycle incorporating satellite and in-situ observations. Output includes variables like ocean temperature, salinity, water velocity, sea surface elevation, and sea ice coverage.

Use Cases

• Predicting ocean currents and temperatures for maritime navigation based on the 8-day forecast guidance.
• Assimilating satellite sea surface temperature data for improving ocean model accuracy.
• Analyzing sea ice concentration and thickness changes for polar region studies.
• Validating other ocean models using the system's nowcast (analysis) fields.

Strengths

• Provides forecasts up to eight days ahead with a 24-hour update cycle.
• Uses a high-resolution 1/12° global grid with 41 vertical levels.
• Assimilates multiple data types including satellite SST, sea surface salinity, and profiles from Argo floats.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

NOAA (National Oceanic and Atmospheric Administration).

Collection Method

Output from the Global Operational Real-Time Ocean Forecast System (Global RTOFS), an eddy-resolving HYCOM model coupled to CICE, with 3DVar data assimilation.

Time Range

Provides near-present nowcasts and 8-day forecasts; specific temporal coverage is not stated.

Freshness

Update frequency is a 24-hour cycle, but the dataset's last update date is unknown.

Geography

Global coverage.