Deriving and evaluating the DTU15 Global high resolution marine gravity field
20/09/2016 | 14:15 | Session 2: New measurement techniques
Author(s): Ole Baltazar Andersen and Per Knudsen
Ole Baltazar Andersen and Per Knudsen
The new high resolution global marine free air gravity field called DTU15 is presented in this presentation. 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.
The DTU15 global marine gravity field, is based on five years of retracked altimetry from Cryosat-2 as well as data from the three other geodetic missions (ERS-1, GEOSAT and Jason-1). However, the older geodetic missions ERS1 and GEOSAT only provide marginal additional information in very limited regions.
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.
An 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.