Articles | Volume 17, issue 3
Research article
17 Jun 2021
Research article |  | 17 Jun 2021

The new CNES-CLS18 global mean dynamic topography

Sandrine Mulet, Marie-Hélène Rio, Hélène Etienne, Camilia Artana, Mathilde Cancet, Gérald Dibarboure, Hui Feng, Romain Husson, Nicolas Picot, Christine Provost, and P. Ted Strub

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Cited articles

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Artana, C., Ferrari, R., Bricaud, C., Lellouche, J.-M., Garric, G., Sennéchael, N., Lee, J.-H., Park, Y.-H., and Provost, C.: Twenty-five years of Mercator ocean reanalysis GLORYS12 at Drake Passage: Velocity assessment and total volume transport, Adv. Space Res., ISSN 0273-1177,, 2019. 
AVISO + MDT: Combined mean dynamic topography – MDT CNES-CLS18, available at:, last access: 1 June 2021. 
Bingham, R., Haines, K., and Hughes, C.: Calculating the Ocean's Mean Dynamic Topography from a Mean Sea Surface and a Geoid, J. Atmos. Ocean. Tech., 25, 1808–1822,, 2008. 
Bruinsma, S. L., Förste, C., Abrikosov, O., Lemoine, J.-M., Marty, J.-C., Mulet, S., Rio, M.-H., and Bonvalot, S.: ESA's satellite-only gravity field model via the direct approach based on all GOCE data, Geophys. Res. Lett., 41, 7508–7514,, 2014. 
Short summary
Satellite altimetry has revolutionized ocean observation by allowing the sea level to be monitored with very good spatiotemporal coverage. However, only the sea level anomalies are retrieved; to monitor the whole oceanic signal a temporal mean (called mean dynamic topography, MDT) must be added to these anomalies. In this study we present the newly updated CNES-CLS18 MDT. An evaluation of this new solution shows significant improvements in both strong currents and coastal areas.