Corsica: A 20-Yr Multi-Mission Absolute Altimeter Calibration Site
2019
Abstract Initially developed for monitoring the performance of TOPEX/Poseidon and follow-on Jason legacy satellite
altimeters, the Corsica geodetic facilities that are located both at Senetosa Cape and near Ajaccio have been developed to calibrate successive satellite
altimetersin an absolute sense. Since 1998, the successful calibration process used to calibrate most of the oceanographic satellite
altimetermissions has been regularly updated in terms of in situ instruments, geodetic measurements and methodologies. In this study, we present an assessment of the long-term stability of the in situ instruments in terms of
sea levelmonitoring that include a careful monitoring of the
geodetic datum. Based on this 20-yr series of
sea levelmeasurements, we present a review of the derived absolute
Sea Surface Height(SSH) biases for the following altimetric missions based on the most recent reprocessing of their data set: TOPEX/Poseidon and Jason-1/2/3, Envisat and ERS-2, CryoSat-2, SARAL/AltiKa and Sentinel-3A&B. For the longest time series the standard error of the absolute SSH biases is now at a few millimeters level which is fundamental to maintain the high level of confidence that scientists have in the global mean
sea level rise.
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