• Andersen, Ole Baltazar
• Knudsen, Per

Abstract

Data from the Cryosat-2 (369 days repeat mission) as well as Jason-1 end-of-life mission are the first new “geodetic mission” data sets released in nearly 2 decades since the ERS-1 and Geosat geodetic missions were conducted in the early 90’th and late 80’th.Besides providing high quality sea surface height observations, the Cryosat-2 has nowcompleted its fifth cycle of 369 days. This opens for new ways of using “pseudo” repeat Geodetic mission data, by averaging or other means of analysisOne further advantage of the Cryosat-2 is its ability of provide new accurate sea surface height information for gravity field determination in the northernmost part of the Arctic Ocean upto 88N where no altimeters have measured before.The first evaluation of the DTU15 global marine gravity field is presented here. The DTU15 isbased on five years of retracked altimetry from Cryosat-2 as well as data from the Jason-2 EOL geodetic missions. It is shown how the older geodetic missions (ERS-1 and GEOSAT) only contribute valuable information in very limited regions of the world.In the Arctic Ocean are testing an new combined empirical/physical retracking system that uses physical retracking of the LRM data using a reduced parameter system in combination with empirical retracking of the SAR and SAR-In data in particularly high latitude regions.

Topics

• impedance spectroscopy
• surface