ECCO V4r4: Monthly Ocean Mixed Layer Depth on a 0.5-Degree Grid

ECCO Version 4 Release 4 provides monthly-averaged ocean mixed layer depth interpolated to a regular 0.5-degree grid. The dataset is a dynamically consistent state estimate produced by NASA, covering the period from January 1992 to January 2018. It assimilates observations from satellite altimeters, radiometers, gravimeters, and in-situ oceanographic instruments.

Use Cases

• Modeling ocean heat uptake and carbon sequestration based on mixed layer depth variability.
• Analyzing seasonal and interannual climate cycles based on the 26-year monthly time series.
• Validating and calibrating general circulation models using the dynamically consistent reconstruction.
• Studying air-sea interaction processes based on the assimilated sea surface temperature and salinity data.

Strengths

• Covers a 26-year period from 1992 to 2018, providing long-term climate context.
• Assimilates multiple observational constraints including satellite altimetry, sea surface temperature, and in-situ profiles.
• Provides data on a regular 0.5-degree global grid, facilitating spatial analysis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data freshness should be verified as the last update is listed as 2026-03-13, which may be a metadata artifact.
• The dataset includes multiple file formats (JPEG, BIN, ISO, HTML, PDF), which may complicate direct analysis.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Dynamically and kinematically consistent reconstruction from the MIT general circulation model, fit to observations in a least-squares sense.

Time Range

1992-01-01 to 2018-01-01

Freshness

Last updated 2026-03-13 03:04:16.482747; update frequency is unknown.

Geography

Global ocean