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TitleAssessments of recent GRACE and release 5's GOCE global geopotential models in Canada
AuthorVéronneau, M; Huang, J
SourceGeological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 38, 2015 p. 160
LinksOnline - En ligne (Page 160)
Alt SeriesEarth Sciences Sector, Contribution Series 20150166
PublisherGAC MAC
MeetingAGU-GAC-MAC-CGU Joint Assembly; Montreal; CA; May 3-7, 2015
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; remote sensing; geodesy; satellite geodesy; GRACE
AbstractThe GOCE satellite by European Space Agency was launched on March 17th, 2009, and re-entered the Earth's atmosphere falling into the ocean on November 11th, 2013. Its objectives were to measure the Earth's gravity field with an accuracy of 1 mGal (one millionth of the Earth's gravity) and geoid with an accuracy of 1-2 cm at a spatial resolution of 100 km. Up to 2014, five generations of GOCE-only and GOCE-based satellite geopotential models have been released. In the meantime, satellite-only geopotential models derived from more than 10 years of observation by the ongoing GRACE mission were also released recently. While these satellite-only models only provide the long and medium wavelengths of the gravity field components, an extra-high degree model (EIGEN-6C4) complete to degree/order 2190 has been developed by combing the GRACE and GOCE models with the terrestrial and marine gravity data to improve the determination of the complete Earth's gravity field. Assessments of the new releases of GRACE- and GOCE-based models are to understand what new and improved gravity information these new GRACE and GOCE models have brought in; what unique contribution of each mission is in term of improving the Earth's gravity field; how accurate these models are in terms of both commission and omission errors; and how the combined model EIGEN-6C4 have improved determination of the full Earth's gravity field. Answers to these questions are necessary for our ultimate goal that is to best use GRACE and GOCE information to improve the geoid model in Canada. This study attempts to address these questions through assessing the recent GRACE models and Release 5's GOCE geopotential models using GPS-Levelling, astronomical deflections of the vertical and gravity data in Canada.