This work outlines how changes in steep bathymetry (from 200 m to 3500 m depth over a distance of 10 km) are reflected on the determined sea surface anomalies at the Gavdos site used for satellite altimeter calibration. After almost 4 years of Jason-2 calibration activities, it has been observed that in some calibrating regions, south of Gavdos Cal/Val, and along the Passes No. 018 and No. 109, certain features in the produced bias showed a permanent characteristic that required further explanation as to its causes. Some of these features seem to be related to the general oceanographic circulation, but others are related to under-sampling of the Earth's gravity field due to the resolution of the geoid model. New reference surfaces for calibration have thus emerged. Finally, new updated values for the Jason-2 altimeter bias have been determined as 191.81 ± 2.80 mm with the geoid model and as 181.51 ± 2.73 mm when using the altimetric Mean Sea Surface model.
|Title of host publication||20 Years of Progress in Radar Altimetry symposium : Abstract book|
|Place of Publication||Italy|
|Publisher||European Space Agency|
|Publication status||Published - 2012|
|Event||20 years of Progress in Radar Altimetry - Venice-Lido, Italy|
Duration: 24 Sep 2012 → 29 Sep 2012
|Conference||20 years of Progress in Radar Altimetry|
|Period||24/09/2012 → 29/09/2012|
Mertikas, S. P., Daskalakis, A., Tziavos, I. N., Andersen, O. B., Vergos, G., Zervakis, V., & Ouwehand, L. (2012). Local Marine Geoid Variations and Jason-2 Bias Determination using the Gavdos Permanent Cal/Val Facility. In 20 Years of Progress in Radar Altimetry symposium: Abstract book European Space Agency.