MITgcm LLC4320 Pre-SWOT: Regional Ocean State Estimates for Bass Strait and Baltic Sea

The MITgcm_LLC4320_Pre-SWOT_JPL_L4 datasets provide regional multivariate oceanographic state estimates from a high-resolution global ocean simulation. The data is derived from the MIT general circulation model (MITgcm) with a 1/48-degree nominal horizontal resolution and 90 vertical levels, forced by ERA-Interim atmospheric reanalysis. These simulations focus on the Bass Strait and Baltic Sea regions, providing hourly three-dimensional and two-dimensional oceanographic variables.

Use Cases

• Validate satellite-derived ocean topography data based on the simulated sea level anomaly and bottom pressure anomaly fields.
• Study upper-ocean mixing processes based on the ocean mixed layer thickness and K-Profile Parameterization (KPP) outputs.
• Analyze regional ocean circulation and heat/freshwater budgets based on the provided temperature, salinity, velocity, and flux variables.
• Assimilate model outputs for regional forecasting systems based on the high-resolution three-dimensional state estimates.

Strengths

• High-resolution model output with 1/48-degree (approximately 2km) nominal horizontal grid and 90 vertical levels.
• Includes both three-dimensional (temperature, salinity, velocity) and two-dimensional (sea level anomaly, fluxes) variables at hourly frequency.
• Simulation is forced by the 6-hourly ERA-Interim atmospheric reanalysis and includes synthetic tidal forcing from 16 dominant constituents.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total dataset size are unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

NASA Jet Propulsion Laboratory (JPL), developed jointly by NASA and CNES with contributions from CSA and UKSA for the SWOT mission.

Collection Method

Numerical simulation using the MIT general circulation model (MITgcm) with LLC4320 configuration, spun up from lower-resolution ECCO simulations.

Time Range

Temporal coverage is not specified in the provided description.

Freshness

Last updated date is unknown.

Geography

Focus regions are the Bass Strait and the Baltic Sea, derived from a global ocean simulation.