LLC4320: High-Resolution Ocean State Estimate for the West Atlantic

LLC4320, a 2km-resolution MITgcm simulation, provides an hourly multivariate oceanographic state estimate focused on the West Atlantic. The model has 90 vertical levels, with 1-meter resolution at the surface, and is forced by ERA-Interim atmospheric reanalysis and synthetic tidal pressure. It includes three-dimensional variables like temperature, salinity, and velocity, alongside two-dimensional fields such as sea level anomaly and surface heat fluxes.

Use Cases

• Validating satellite-derived sea surface height and temperature data against modeled sea level anomaly and potential temperature.
• Studying upper-ocean mixing processes using the high vertical resolution (1m at surface) and KPP boundary layer parameterization.
• Analyzing regional freshwater and heat budgets based on the net freshwater flux and net heat flux variables.
• Investigating tidal influences on circulation using the model's forcing from 16 dominant tidal constituents.

Strengths

• Features a very high nominal horizontal resolution of 1/48-degree (approximately 2km at the equator).
• Provides hourly temporal resolution for capturing diurnal and sub-daily ocean processes.
• Includes a detailed vertical structure with 90 levels, optimized for the upper ocean (1m resolution at surface, 30m down to 500m).

Limitations

• Critical metadata is missing: specific column names, row counts, and dataset size are not provided.
• There is a conflict in the 'last updated' dates, with one source showing 2026 and another showing 2012, casting doubt on data freshness.
• The license is listed as 'other-license-specified' without explicit details, requiring further investigation for reuse.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Output from a global ocean numerical simulation using the MIT general circulation model (MITgcm), spun up from lower-resolution ECCO simulations and forced by ERA-Interim reanalysis.

Time Range

null

Freshness

Last updated dates conflict: one source reports 2026-04 10, another reports 2012-11-15.

Geography

Global ocean simulation with a focus on the West Atlantic region.