Latest - V4r4

ECCO Central Production Version 4 Release 4

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


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).


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

ECCO Version 4 Release 4 Dataset
ECCO Consortium, 2019: ECCO Central Estimate Version 4 Release 4. Retrieved from [to be specified by user].
ECCO Version 4 Release 4 Synopsis
ECCO Consortium, 2019: ECCO Version 4 Release 4 Synopsis PDF (863 KB) »
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, 3071-3104, doi:10.5194/gmd-8-3071-2015. View »

Download Dataset

Note: ECCO's anonymous ftp server 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*. 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
Variable: Ocean State (temperature, salinity, velocity, sea level, bottom pressure), Fluxes (temperature, salt, volume)
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.