ECCO V4r4: Monthly Ocean Momentum Tendency on LLC90 Grid, 1992-2017

ECCO Version 4 Release 4 provides monthly-averaged, three-dimensional ocean momentum tendency data on a 1-degree global LLC90 grid. NASA's state estimate combines a free-running MITgcm simulation with a least-squares fit to multiple observational constraints, including satellite altimetry, sea surface temperature, and in-situ profiles. The dataset covers a 26-year period from January 1992 to January 2018.

Use Cases

• Validate and calibrate ocean general circulation models based on the dynamically consistent state estimate.
• Analyze long-term trends in ocean momentum and circulation based on the 26-year monthly time series.
• Study ocean-atmosphere coupling dynamics based on the reconstructed surface atmospheric states.
• Assimilate observational data into models using the methodology described for the ECCO V4r4 fit.

Strengths

• Integrates multiple observational data streams, including satellite altimeters from 9 missions and in-situ data from programs like Argo and GO-SHIP.
• Covers a substantial 26-year temporal range from 1992 to 2018.
• Provides a dynamically and kinematically consistent reconstruction of ocean, sea-ice, and atmospheric states.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific computational tasks.
• Data is provided in multiple non-standard file formats (JPEG, BIN, ISO, HTML, PDF), which may complicate access and processing.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Free-running solution of the MITgcm, fit to observations in a least-squares sense.

Time Range

1992-01-01 to 2018-01-01

Freshness

Last updated 2026-03-13 03:04:03.372702; freshness should be verified.

Geography

Global ocean coverage on a 1-degree model grid.