ECCO V4r4b: Daily Ocean Bottom Pressure on LLC90 Grid, 1992-2018

ECCO Version 4 Release 4b provides a 26-year reconstruction of daily-averaged ocean bottom pressure on a specialized 1-degree global grid. This NASA state estimate combines a free-running MITgcm simulation with constraints from multiple satellite and in-situ observations, including altimetry, gravimetry, and sea surface temperature. The dataset spans from 1992-01-01 to 2018-01-01, offering a dynamically consistent view of ocean and sea-ice states.

Use Cases

• Modeling deep ocean circulation and mass transport based on daily bottom pressure anomalies.
• Validating satellite-derived ocean bottom pressure measurements from GRACE against a model-constrained estimate.
• Studying long-term trends in ocean mass and its contribution to sea level rise over the 26-year period.
• Analyzing the consistency between ocean dynamics and observations like sea surface height and temperature within a state estimation framework.

Strengths

• Covers a 26-year time range from 1992 to 2018, providing a long-term climate record.
• Integrates constraints from multiple observational sources including satellite altimeters, gravimeters, radiometers, and in-situ programs.
• Provides data on a specialized Lat-Lon-Cap 90 (LLC90) model grid native to the MITgcm.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific ML tasks.
• Data freshness should be verified as the last metadata update is projected for 2026.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Dynamically and kinematically-consistent ocean state estimate, fitting a MITgcm simulation to observations in a least-squares sense.

Time Range

1992-01-01T12:00:00 to 2018-01-01T00:00:00

Freshness

Last metadata update 2026-03 13; data coverage ends 2018-01-01.

Geography

Global ocean coverage on a 1-degree model grid.