Antonis Daskalakis (Space Geomatica Ltd., Greece); Ilias Tziavos (Aristotle University of Thessaloniki, Greece); George Vergos (Aristotle University of Thessaloniki, Greece); Hailong Peng (National Ocean Satellite Applications Service, China); Xinghua Zhou (First Institute of Oceanography, China); Fangli Qiao (First Institute of Oceanography, China); Vasilis Zervakis (University of the Aegean, Greece)

This work presents the latest calibration results for the Jason-2 and the Chinese HY-2 mission conducted at the Gavdos/Crete calibration/validation facilities. Absolute biases for the Jason-2 altimeter will be given for the ascending Pass No.109, as well as for the descending Pass No.18, and based on the GDR-D data products. These values for both orbits will be compared against each other at the same Cal/Val location and setting so that orbit directional errors will be evaluated. Furthermore, the altimeter bias for the Chinese HY-2 satellite will be reported using the CRS1 permanent site in south west Crete, Greece and along the descending HY-2 Pass No. 280, using 20 Hz data and recent S-GDR data products. Wet troposphere and ionosphere delays coming from satellite sensors will be examined against in-situ GNSS measurements. Additionally, altimeter biases as determined by locally developed Mean Sea Surface model, will be presented and compared against the conventional sea-surface calibration results.