[ecco-support] Inquiry about differences between ECCO V4r4 and V5 Alpha

[Wang, Ou (US 321D)]

Hi JeongHyun,

There are essentially no differences between V4r4 and V5 interns of containing data and the methodology/production process.

References:
V4r4:
Forget, G., Campin, J.-M., Heimbach, P., Hill, C. N., Ponte, R. M., and Wunsch, C.: ECCO version 4: an integrated framework for non-linear inverse modeling and global ocean state estimation, Geosci. Model Dev., 8, 3071–3104, https://doi.org/10.5194/gmd-8-3071-2015, 2015.

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

V5 Alpha:
Hong Zhang, Dimitris Menemenlis, Ian Fenty (2018) ECCO LLC270 Ocean-Ice State Estim. http://hdl.handle.net/1721.1/119821

Best regards,

Ou Wang

From: ecco-support <ecco-support-bounces at mit.edu> on behalf of JeongHyun Kim <jeongk at stanford.edu>
Date: Tuesday, June 30, 2026 at 3:29 PM
To: ecco-support at mit.edu <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] Inquiry about differences between ECCO V4r4 and V5 Alpha

Dear ECCO Support Team,

Hi, I am currently using both ECCO V4r4 and ECCO V5 Alpha in my research. While the website lists V4r4 as the latest released model, I have also downloaded V5 Alpha from ECCO Drive to utilize the higher-resolution data.

I would like to better understand the differences between these two products. I understand that they cover the same time period but differ in spatial resolution. Beyond resolution, I am particularly interested in knowing:


  1.
Are there differences in the observational data used to constrain the model between V4r4 and V5 Alpha?
  2.
Are there differences in the methodology or production process between the two versions?

Could you provide information or direct me to resources that explain these differences in detail?

Thank you for your assistance.

Best regards,
JeongHyun Kim

PhD Candidate
Department of Earth System Science
Stanford University
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