i NASA ECCO - Latest: V4r4

Latest - V4r4

ECCO Central Production Version 4 Release 4

Authors: Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., and Ponte, R.M.


The ECCO Drive is temporarily offline due to an IT security issue. Please visit the following mirror sites for these ECCO products:


ECCO Version 4 release 4 (V4r4), covering the period 1992-2017, represents ECCO's latest ocean state estimate. This product is an updated edition to that described by Forget et al. (2015, Geosci. Model Dev.). Version 4 is the first multi-decadal ECCO estimate that is truly global, including the Arctic Ocean. The Release 4 edition includes improvements in time-period (1992-2017), model (e.g., sea-ice), observations (e.g., GRACE, Aquarius), and constraints (e.g., correlated errors).

Errata (V4r4b; June 2021)

An issue has been identified and corrected with atmospheric pressure forcing used in V4r4. Main effects of the error are on sub-monthly time scales, for which a dynamical response to atmospheric pressure is expected. Solution fields most measurably impacted are sea level and bottom pressure. See Errata document for details and corrected fields.


As a condition of using this product, you must use the following citations:

ECCO Version 4 Release 4 Dataset
ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., & Ponte, R. M. (DATE ACCESSED). ECCO Central Estimate (Version 4 Release 4). Retrieved from URL ACCESSED.*
*DATE ACCESSED and URL ACCESSED to be specified by user.
ECCO Version 4 Release 4 Synopsis
ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., & Ponte, R. M. (2021, February 10). Synopsis of the ECCO Central Production Global Ocean and Sea-Ice State Estimate (Version 4 Release 4). https://doi.org/10.5281/zenodo.4533349
ECCO Version 4 Description
Forget, G., J.-M. Campin, P. Heimbach, C. N. Hill, R. M. Ponte, and C. Wunsch, 2015: ECCO version 4: An integrated framework for non-linear inverse modeling and global ocean state estimation. Geoscientific Model Development, 8. https://www.geosci-model-dev.net/8/3071/2015/

Download Dataset

Note: ECCO's anonymous ftp server ftp://ecco.jpl.nas.gov has been discontinued.

Option 1: Monthly Fields on ECCO Drive

ECCO Drive* is a WebDAV server that offers users a familiar interface to browse and download data through a web browser. Additionaly, ECCO's WebDAV server lets you mount ECCO Drive as if it were a local disk. Users can also transfer ECCO Drive files via the command line.

Note: To use ECCO Drive users must first register for an Earthdata account. After creating an Earthdata account, you will be issued ECCO Drive "WebDAV/Programmaic API credentials" (login and password) which you can find at https://ecco.jpl.nasa.gov/drive/*. ECCO Drive WebDAV/Programmatic API credentials are not required to browse or download files from the web portal, but they are required to mount the ECCO Drive to your local machine and to download ECCO Drive files using command line tools like wget. Just remember that your Earthdata and ECCO Drive credentials are different!

ECCO Drive Web Interface* »
ECCO Drive Mounting Instructions* »
ECCO Drive Command Line Instructions »

Option 2: Daily Fields on the NASA Advanced Supercomputing (NAS) ECCO Data Portal

The NAS Data Portal hosts daily ECCO fields on the NAS ECCO Data Portal, a portal that allows users to browse and download data through their web browser.

NAS ECCO Data Portal »

Period: Jan 1992 - Dec 2017
Grid & Resolution: LLC90 (1 deg)
Domain: Global
  • Ocean State (temperature, salinity, velocity, sea level, density, hydrostatic pressure, bottom pressure), Fluxes (temperature, salt, volume)
  • Sea-Ice State (concentration, ice and snow thickness, velocity, pressure loading)
  • Atmosphere Surface State (temperature, humidity, precipitation, pressure, winds, wind stress)
  • Ocean and Sea-Ice Surface Fluxes (freshwater, heat, and momentum)
  • Ocean 3D Fluxes (temperature, salinity, volume)
  • Sea-Ice 2D Fluxes (ice and snow volume)
  • Subgrid-scale Parameters (3D vertical diffusivity, 3D Gent-McWilliams/Redi eddy coefficient)
Temporal Resolution: Monthly, Daily, Hourly
Data Used: Satellite Altimetry, ARGO, GRACE, Aquarius, CTD, XBT
Type of Estimation: Adjoint
Data Format(s): NetCDF, Binary
Version: Release 4
Contact Person: Ian Fenty, Ichiro Fukumori, Ou Wang
Last Updated Date: October 24, 2019

User Guide

A detailed description of available files and their content are summarized in the V4r4 User Guide.

*ECCO Drive requires a NASA Earthdata Account for access.
Example of the fidelity of ECCO to observations
Click on the image to view an example of the fidelity of ECCO to observations.
Global mean time-series of sea level and ocean bottom pressure (in equivalent sea level) of V4r4 in comparison to observations
Global mean time-series of sea level and ocean bottom pressure (in equivalent sea level) of V4r4 in comparison to observations.