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Coastal Altimetry Activities in the Sentinel-3 Validation Team
Pierre Féménias, Remko Scharroo, al. et
ESA ESRIN, Italy
9:45 - 10:05
Performances over Coastal areas of the SAR Mode Processing in Sentinel-3A Products
Matthias Raynal1, Sylvie Labroue1, Stéphanie Urien1, Laiba Amarouche1, Sylvain Jourdain1, Graham Quartly2, Pierre Féménias3, Jérôme Benveniste3, Francois Boy4, Salvatore Dinardo5
1CLS, France; 2PML; 3ESA; 4CNES; 5EUMETSAT
Sentinel-3A mission was successfully launched in February 2016. It is a multi-instrument mission to measure sea-surface topography, sea- and land-surface temperature, ocean colour and land colour with high-end accuracy and reliability. We focus here on the observations acquired by the sea-surface topography payload that encompasses a dual frequency altimeter, a dual frequency radiometer and Doris and GNSS sensors. A specificity of the Sentinel-3A mission is that it embarks a Delay Doppler altimeter. The SRAL altimeter operates continuously in Delay Doppler mode (or the so-called SARM) over all surfaces since the 12 April 2016. Thanks to the reduced footprint coupled with a lower instrumental noise, the SARM technique should provide improved sea level observations over coastal regions. We will present the performance of the SARM observations over different coastal regions through the assessment of the Sentinel-3A Level 2 products. The SARM processing within the Sentinel-3A operational ground segment is quite close to other existing ones (CNES processing and GPOD processing for instance) either for the Doppler processing or for the retracker. Different metrics will highlight the performance of the Sentinel-3A SARM sea level over the specific case coastal areas and more specifically the behavior of different SARM retrackers (SAMOSA 2.3, SAMOSA 2.5 and S3PP).