Assessment of optimal coastal altimetric corrections in a flat coastal environment around the Aix island sea-level observatory, France

Laurent Testut (LIENSs/LEGOS, France)


Maryia Velikova (LIENSs, France); Valérie Ballu (LIENSs, France); Pascal Bonnefond (Obserbatoire de Paris / SYRTE, France); Olivier Laurain (OCA/Géoazur, France); Xavier Bertin (LIENSs, France)

Event: 2018 Ocean Surface Topography Science Team Meeting

Session: Regional and Global CAL/VAL for Assembling a Climate Data Record

Presentation type: Type Poster

Satellite altimetry in coastal areas is a challenging task due to both altimeter and radiometer contamination by land. However, the ability to use satellite altimetry data as close as possible to the coast would be invaluable and would benefit numerous applications such as local sea-level monitoring or hydrodynamic modeling and coastal oceanography. Aix island is located between the two flat elongated islands of Ré and Oléron, which define a >10km wide inlet, sufficiently
large for satellite altimeters to provide SSH measurements. The Aix island sea-level observatory provides in-situ data, such as tide gauge and GPS, which can be used to validate SSH
estimates and improve specific corrections. In this work, we will update a previous work based on the investigation of the quality of the altimeter corrections in this specific coastal zone. This inlcude the SSB correction which will be compared with significant wave height provided by a local
wave model and an offshore gauge. Waves are computed using a fully coupled modeling system, combining a 2DH circulation model and a spectral wave model that use an unstructured grid, with a spatial resolution ranging from 100 to 1000 m. We will also show the improvement of a local tidal model and look at the improvement of the tropospheric delay correction when using tropospheric delay modeled from local GPS stations, with respect to using the tropospheric delay estimated from the land-contaminated radiometer.

Poster show times:

Room Start Date End Date
Foyer, Salao Nobre & tent Thu, Sep 27 2018,18:00 Thu, Sep 27 2018,20:00
Foyer, Salao Nobre & tent Fri, Sep 28 2018,14:00 Fri, Sep 28 2018,15:00
Laurent Testut