2:30 PM - 2:45 PM
[G02-5-05] Towards a new Global marine gravity field based on SARAL/ALtiKa, Jason-1 and Cryosat-2 Geodetic Missions
A latest steps towards a new global high resolution global marine free air gravity field called DTU17 is presented in this presentation. Data from the latest generation of high-class geodeit miccions creates the basis for this new global marine gravity field. A total of 9 years grom three geodetic missions including (7 years of Cryosat-2 (369 days repeat mission) as well as one year of Jason-1 end-of-life mission and one year of SARA/AltiKa geodetic mission). Older geodetic missions (ERS-1 and GEOSAT) are now nearly retired in DTU17 and provide marginal information in a very few regions.
In the Arctic Ocean we will present results from several new developments in high resolution gravity field modelling. One is a a new dual-pass retracking of SARAL/AltiKa together with an new combined empirical/physical retracking system for Cryosat-2 that uses physical retracking of the LRM data n combination with empirical retracking of the SAR and SAR-In data.
A new medium wavelength correction based on altimetry and GOCE have been introduced to deal with problems in the older remove restore technology based on EGM2008. This is particularly important for Cryosat-2 due to its ability of provide new accurate sea surface height information for gravity field determination all the way up to 88N where no altimeters have measured before.
In the Arctic Ocean we will present results from several new developments in high resolution gravity field modelling. One is a a new dual-pass retracking of SARAL/AltiKa together with an new combined empirical/physical retracking system for Cryosat-2 that uses physical retracking of the LRM data n combination with empirical retracking of the SAR and SAR-In data.
A new medium wavelength correction based on altimetry and GOCE have been introduced to deal with problems in the older remove restore technology based on EGM2008. This is particularly important for Cryosat-2 due to its ability of provide new accurate sea surface height information for gravity field determination all the way up to 88N where no altimeters have measured before.