ECCO V4r4: 3D Ocean Mixing Coefficients on a 0.5-Degree Grid, 1992-2017

ECCO Version 4 Release 4 provides time-invariant, three-dimensional coefficients for Gent-McWilliams and Redi parameterizations and background vertical diffusivity, interpolated to a regular 0.5-degree grid. This dataset is a dynamically consistent ocean state estimate from NASA, fitting a 1-degree MITgcm model to over 25 years of satellite and in-situ observations. The reconstruction covers the period from 1992-01-01 to 2018-01-01.

Use Cases

• Tuning ocean model mixing schemes based on the estimated 3D coefficients.
• Analyzing spatial patterns of ocean mixing based on the gridded parameterization fields.
• Validating other ocean model outputs against a dynamically consistent state estimate.
• Studying the impact of data assimilation on derived physical parameters like diffusivity.

Strengths

• Derived from a 26-year (1992-2017) ocean state estimate that assimilates multiple satellite and in-situ data streams.
• Provides three distinct, spatially-varying mixing coefficients (Gent-McWilliams, Redi, background vertical diffusivity) on a consistent 0.5-degree grid.
• Produced by NASA using the MIT general circulation model (MITgcm) and a least-squares fitting approach to observations.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data is provided in multiple file formats (JPEG, BIN, ISO, HTML, PDF), which may complicate direct analysis.
• Row count and dataset size are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Generated from the ECCO V4r4 optimization, a free-running solution of the MITgcm fit to observations in a least-squares sense.

Time Range

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

Freshness

Last updated 2026-03-13 03:04:57.874036; freshness should be verified.

Geography

Global ocean coverage on a 0.5-degree latitude-longitude grid.