California ROMS

California ROMS

Model Summary

The California ROMS model extends from just north of the CA-Oregon border south to Mexico and has a resolution of 3 km. Forecasts (72 hr) and nowcasts are available in near real-time for sea surface height, water temperature, salinity, and currents. This model is operated by UCLA and Remote Sensing Solutions.

The California (CA) ROMS (Regional Ocean Modeling System) is run by UCLA and Remote Sensing Solutions jointly funded by Central and Northern California Ocean Observing System (CeNCOOS) and Southern California Coastal Ocean Observing System (SCCOOS).

The CA ROMS model has a horizontal grid of 3.3 km and 40 terrain-following vertical layers. The thickness of the surface layer ranges from 0.25 meter near the coast to 4 meters offshore.  The open boundary conditions are provided by the global non-tidal-resolving HYCOM 1/12o model run by the Naval Oceanographic Office.  Tidal boundary conditions are added using the global TPXO model output with eight (8) tidal constituents.  Atmospheric forcing is derived from NCEP WRF-based 5 km atmospheric nowcast and 72-hour forecast.  The river forcing is not included in the current configuration but will be added in the near future. 

Data assimilation is based on the multi-scale 3-dimentional variational (3DVAR) method.  Assimilated data include satellites sea surface temperature (SST) and sea surface height (SSH), surface current derived from high-frequency (HF) radar, vertical profiles of temperature and salinity as measured by moorings, profiling floats and gliders. 

The CA ROMS 3 km model is run daily and produces nowcast every six hours and 72-hour forecast initialized on 03 UTC.

Additional information can be found at the RSS web site and the SCCOOS web site.


Nowcast & Forecast Images


Graphics of California ROMS nowcasts and forecasts for salinity, temperature, sea surface height and currents back to April 2013. Output is available by region for all of California, Central and Northern California, the North Coast, San Francisco Bay area, Monterey Bay area, and the Central Coast.



California ROMS Drop A Drifter

Calculate water trajectories off the California Coast with the Drop-A-Drifter tool. The movement of a particle of water (the trajectory) can be computed at selected depths of the upper 400 meters during the past two weeks and 72-hrs into the future. This can indicate where a floating substance (oil) or object (buoy) came from or will go.


Interactive Google Map


In addition to the direct model web site, SCCOOS our Southern California counterpart has developed an interactive map-based display for the 3 km CA ROMS model.


Current Trajectory Animation


CeNCOOS produces a near real-time animation of the surface currents forecast by the 3 km California ROMS Model. The animation is updated twice a day with the latest 72 hour forecast from the ROMS model. Check out the surface current animation page to get more details and view the latest trajectories.