1/ there is a new dataset of multimission gridded sea level heights and velocities in v2.0 obtained with the Multiscale Inversion of Ocean Surface Topography (MIOST) mapping approach. This method is fully described in Ubelmann et al. (2021) and has been successfully applied and validated in open-ocean regions (Ballarotta et al., 2023). This dataset is now available to the community and experts to gather further validation and feedback, with the goal of implementing it in production in the coming months or years.

2/ the multimission gridded sea level heights and velocities in v2.0 obtained with the Optimal Interpolation (OI) mapping method (Bretherton et al., 1976) has been actualized with the addition of the formal error variables. 

The methodology for the Polar Oceans products is detailed in Veillard et al., 2024.

All information:
Experimental Products: Polar Ocean Along-track Level-3 Sea Surface Heights: 10.24400/527896/AVISO-2026.004 
Experimental Products: Polar Ocean Gridded Level-4 Sea Surface Heights and Velocities: 10.24400/527896/AVISO-2026.005
Handbook : https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/hdbk_duacs_experimental_SLA_polar_oceans.pdf

Data access:

CNES AVISO FTP/SFTP access (with AVISO+ credentials):

• ftp://ftp-access.aviso.altimetry.fr:21
• sftp://ftp-access.aviso.altimetry.fr:2221 
• L3: 
  • /duacs-experimental/dt-phy-along-track/polar 
• L4: 
  • /duacs-experimental/dt-phy-grids/polar_monomission 
  • /duacs-experimental/dt-phy-grids/polar_multimission 

CNES AVISO THREDDS Data Server access (with AVISO+ credentials): 

• L3: 
  • https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L3/dataset-duacs-experimental-dt-phy-along-track-altimetry-polar-oceans.html 
• L4: 
  • https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L4/dataset-duacs-experimental-dt-phy-grids-altimetry-polar-oceans.html 

References: 

Ballarotta, M., Ubelmann, C., Veillard, P., Prandi, P., Etienne, H., Mulet, S., Faugère, Y., Dibarboure, G., Morrow, R., and Picot, N.: Improved global sea surface height and current maps from remote sensing and in situ observations, Earth Syst. Sci. Data, 15, 295–315, https://doi.org/10.5194/essd-15- 295-2023, 2023.

Bretherton, F. P., Davis, R. E., and Fandry, C.: A technique for objective analysis and design of oceanographic instruments applied to MODE-73, Deep-Sea Res., 23, 559–582, https://doi.org/10.1016/0011-7471(76)90001-2, 1976.

Ubelmann, C., Dibarboure, G., Gaultier, L., Ponte, A., Ardhuin, F., Ballarotta, M., and Faugère, Y.: Reconstructing ocean surface current combining altimetry and future spaceborne Doppler data, J. Geophys. Res.-Oceans, 126, e2020JC016560, https://doi.org/10.1029/2020JC016560, 2021.

Veillard P, Prandi P, Pujol M-I, Daguzé J-A, Piras F, Dibarboure G and Faugère Y (2024) Arctic and Southern Ocean polar sea level maps and along-tracks from multi-mission satellite altimetry from 2011 to 2021. Front. Mar. Sci. 11:1419132. https://doi.org/10.3389/fmars.2024.1419132 

The planned maintenance operation on the AVISO website has been successfully completed.

The website is now fully available again and all services are operational, including user registration, account management, and data mailing lists update.

Data dissemination and download services remain available as usual.

If you encounter any issue following this upgrade, please contact us at aviso@altimetry.fr.

Thank you for your patience and understanding throughout this maintenance period.

The AVISO Team

As part of our continuous service improvement activities, the AVISO website will undergo a technical upgrade.

The operation is scheduled from July 6, 2026, 14:00 (UTC+2) to July 9, 2026, 14:00 (UTC+2).

During this maintenance window, the websites may be temporarily unavailable and a maintenance page will be displayed.

Data dissemination and download services will remain operational throughout the intervention. Users with valid AVISO accounts will continue to access and download data normally.

We apologize for any inconvenience and thank you for your patience and understanding.

The AVISO Team

• Project news from the Missions Project Team at CNES
• Presentation of several tools & products available through Aviso
• An analysis of users’ feedbacks
• Events and publications around Swot
• And a summary of three years of Swot

Hope you will enjoy this new issue!
 

Find all the past newsletters