Ocean Science
Ocean Science
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Articles | Volume 21, issue 3
Articles | Volume 21, issue 3
https://doi.org/10.5194/os-21-1033-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-1033-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 3
Research article
 | 
16 Jun 2025
Research article |  | 16 Jun 2025

Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea

Xiaoya Zhang, Lei Liu, Jianfang Fei, Zhijin Li, Zexun Wei, Zhiwei Zhang, Xingliang Jiang, Zexin Dong, and Feng Xu

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Abdalla, S., Abdeh Kolahchi, A., Ablain, M., et al.: Altimetry for the future: Building on 25 years of progress, Adv. Space Res., 68, 319–363, https://doi.org/10.1016/j.asr.2021.01.022, 2021. 
Archer, M. R., Li, Z., and Fu, L.: Increasing the Space–Time Resolution of Mapped Sea Surface Height From Altimetry, J. Geophys. Res.-Oceans, 125, e2019JC015878, https://doi.org/10.1029/2019JC015878, 2020. 
AVISO/DUACS: SWOT Level-3 KaRIn Low Rate SSH Basic (1.0), Aviso [data set], https://doi.org/10.24400/527896/A01-2023.017, 2024. 
Ballarotta, M., Ubelmann, C., Pujol, M.-I., Taburet, G., Fournier, F., Legeais, J.-F., Faugère, Y., Delepoulle, A., Chelton, D., Dibarboure, G., and Picot, N.: On the resolutions of ocean altimetry maps, Ocean Sci., 15, 1091–1109, https://doi.org/10.5194/os-15-1091-2019, 2019. 
Ballarotta, M., Ubelmann, C., Rogé, M., Fournier, F., Faugère, Y., Dibarboure, G., Morrow, R., and Picot, N.: Dynamic Mapping of Along-Track Ocean Altimetry: Performance from Real Observations, J. Atmos. Ocean. Tech., 37, 1593–1601, https://doi.org/10.1175/JTECH-D-20-0030.1, 2020. 
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Our research evaluated the precision of mapping the ocean's surface with combined data from a couple of satellites, focusing on dynamic aspects revealed by sea level changes. The results show that 2DVAR (two-dimensional variation), a new mapping product, aligns more closely and with less error with the most advanced satellite observations than a widely used mapping product called AVISO (Archiving, Validation, and Interpretation of Satellite Oceanographic). The results suggest that 2DVAR detects minor ocean movements better, making it more valuable and reliable for ocean dynamic study.
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