Evaluation of the Global Altimetric Marine Gravity Field DTU15: Using Marine Gravity and GOCE Satellite Gravity

• Main Authors: Andersen, O., Knudsen, P., Kenyon, S., Holmes, S., Factor, John K.
• Other Authors: Sánchez, Laura, Freymueller, Jeffrey T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer 2019
• Subjects: GOCE; Marine gravity; Satellite altimetry; /dk/atira/pure/sustainabledevelopmentgoals/life_below_water; name=SDG 14 - Life Below Water; Arctic
• Online Access: https://orbit.dtu.dk/en/publications/993adccb-4e70-44c3-bd08-083139e573a0; https://doi.org/10.1007/1345_2018_52

Global marine gravity field modelling using satellite altimetry has been undergoing constant improvement since the launch of Cryosat-2 mission in 2010. With its 369 day-repeat Cryosat-2 provides one repeat of geodetic mission data with 8 km global resolution each year. Together with the completion of the Jason-1 end-of-life geodetic mission in 2011 and 2012, these new satellites has provided more than 4 times three times as much geodetic missions altimetric sea surface height observations than ever before. The higher precision of these new sea surface height observations compared with observations from ERS-1 and Geosat results in a dramatic improvement of the shorter wavelength of the gravity field (12–20 km) resulting in much favorable comparison with marine gravity. The pan-Arctic altimetric gravity field now surpassing 2008 Arctic Gravity Field project derived from multiple gravity field sources. A direct comparison between Arctic marine gravity fields and independent gravity field from the Gravity Field and Steady-State Ocean Circulation Explorer to degree and order 280 confirms this.