Per Knudsen (DTU Space, Denmark); Adili Abulaitijiang (DTU Space, Denmark)

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.
A new high resolution bathymetry map (DTU15BAT) is also presented. This has been derived from the recently released 30 minute 2014 GEBCO (General Bathymetry Chart of the Oceans) where a certain part of the spectra is improved using the DTU15 Gravity field.