The DTU21 Global marine gravity field based on existing altimetric Geodetic Missions and outlook towards the use of SWOT ...

• Main Authors: Andersen, Ole, Knudsen, Per, Ludwigsen, Carsten, Rose, Stine Kildegaard, Abulaitijiang, Adili
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Arctic Ocean
• Online Access: https://dx.doi.org/10.57757/iugg23-1278; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017344

<!--!introduction!--> The newest DTU global high-resolution global marine free air gravity field called DTU21 is presented in this presentation and the first evaluation against marine and airborne gravity is performed. A total of 14 years from geodetic missions including (7 years of Cryosat-2 (369 days repeat mission) as well as 3 years of Jason-1+2 end-of-life missions and 4 years of SARA/AltiKa drifting geodetic mission). Older geodetic missions (ERS-1 and GEOSAT) are now nearly retired. All Geodetic missions have been fully retracked using the 2-pass retracker developed by Sandwell and Smith, (2005) to increase the range precision. Subsequently, we derive 2-Hz altimetric observations from the 20/40 Hz retracked data using the Parks McClellan filter to avoid spectral leakage degrading the 10-40 km wavelength which is an effect of the box filter normally used to compute 1 Hz data. In the Arctic Ocean, we will present results from several new developments in high-resolution gravity field modelling. One ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...