EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Coastal sea level changes in Africa from retracked Jason altimetry over 2002-2020

Yvan Gouzenes1, Anny Cazenave1,2, Fabien Léger1, Florence Birol1, Marcello Passaro3, Fernando Nino1, Francisco Calafat4, Andrew Shaw5, Jean-François Legeais6, and Jérome Benveniste7
Yvan Gouzenes et al.
  • 1LEGOS, Toulouse, France
  • 2ISSI, Bern, Switzerland
  • 3TUM, Munich, Germany
  • 4NOC, Liverpool, United Kingdom
  • 5SKYMAT, Southampton, United Kingdom
  • 6CLS, Ramonville St Agne, France
  • 7ESA/ESRIN Frascati, Italy

Climate-related sea level changes in the world coastal zones result from the superposition of the global mean rise due to ocean warming and land ice melt, regional changes mostly caused by non-uniform ocean thermal expansion and salinity changes, and small-scale coastal processes (e.g., shelf currents, wind & waves changes, fresh water input from rivers, etc.). So far, satellite altimetry has provided global gridded sea level time series up to 10-15 km to the coast only, preventing estimation of sea level changes very close to the coast. In the context of the ESA Climate Change Initiative coastal sea level project, we have developed a complete reprocessing of high-resolution (20 Hz) Jason-1, 2 and 3 altimetry data along the world coastal zones using the ALES (Adaptative Leading Edge Subwaveform) retracker combined with the XTRACK system dedicated to improve geophysical corrections at the coast. Here we present coastal sea level trends over the period 2002-2020 along the whole African continent. Different coastal sea level trend behaviors are observed over the study period. We compare the computed coastal trends in Africa with results we previously obtained in other regions (Mediterranean Sea, Northeastern Europe, north Indian Sea, southeast Asia and Australia).

How to cite: Gouzenes, Y., Cazenave, A., Léger, F., Birol, F., Passaro, M., Nino, F., Calafat, F., Shaw, A., Legeais, J.-F., and Benveniste, J.: Coastal sea level changes in Africa from retracked Jason altimetry over 2002-2020, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14643,, 2021.

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