ECCO-V4r4Authors: Fukumori, Ichiro; Wang, Ou; Fenty, Ian; Forget, Gael; Heimbach, Patrick; Ponte, Rui M.
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).
[Image at right] Global mean time-series of sea level and ocean bottom pressure (in equivalent sea level) of V4r4 in comparison to observations.
Due to NASA's mandate to disallow the use of the ftp protocol for data access, ECCO's anonymous ftp server ftp://ecco.jpl.nasa.gov has been replaced by a WebDAV server called ECCO Drive. Each user must first register for an Earthdata account at https://urs.earthdata.nasa .gov/users/new in order to access the ECCO products. ECCO Drive https://ecco.jpl.nasa.gov/drive/files offers a familiar interface for users to browse and download data through their browser. Additionaly, ECCO's WebDAV interface allows one to connect to ECCO as if it were a local drive. It also allows users to access data via a command line interface, enabling scripted data extracting. A detailed help page can be found at https://ecco.jpl.nasa.gov/drive/help.
Command line example:
To use wget to download ECCO v4r4's monthly SSH on the native grid:
wget -r --no-parent --user YOUREARTHDATAUSERNAME --ask-password https://ecco.jpl.nasa.gov/drive/files/Version4/Release4/nctiles_monthly/SSH
When prompted for password, you need to enter your ECCO Drive's WebDAV password, not your Earthdata account's password. To get the WebDAV password, log in with your Earthdata account from a web browser to https://ecco.jpl.nasa.gov/drive. Once successfully log in, you will be re-directed to the page of your WebDAV/Programmatic API credentials. Your ECCO Drive's WebDAV password is in the second box from top. This is the password that you would use for the wget command.
|Period:||Jan 1992 - Dec 2017|
|Grid & Resolution:||LLC90 (1 deg)|
|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|
|Contact Person:||Ian Fenty, Ichiro Fukumori, Ou Wang|
|Last Updated Date:||October 24, 2019|
As a condition of using this product, you must cite the use of this product using the following citation.
Fukumori, I., O. Wang, I. Fenty, G. Forget, P. Heimbach, and R. M. Ponte, 2019: ECCO Version 4 Release 4, Avfailable at https://ecco.jpl.nasa.gov/drive/files/Version4/Release4/doc/v4r4_synopsis.pdf
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
For more information, see our Use and Copyright Web page.
A detailed description of available files and their content are summarized in a "User Guide" in the link below. Although written for the previous release (V4r3), the User Guide, in addition to other files that folllow, apply equally to the present Release 4 estimate.
ecco_v4_py: A Python package and tutorial for V4r3
gcmfaces: A general Matlab/Octave toolbox for analyzing V4r3
Guide for calculating budgets with V4r3 output
Guide for reproducing V4r4 results with MITgcm
Synopsis of V4r4 estimation
Overview of V4r3 files
Plots of V4r4
Data used in V4r3