Joint inversion of gravimetric and electromagnetic satellite observations to infer global time series of oceanic volume transport (GREMLIN)

• Applicant: Dr. Jan Saynisch-Wagner
• Subject Area: Geodesy, Photogrammetry, Remote Sensing, Geoinformatics, Cartography ; Oceanography
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 537025137

We aim at the estimation of oceanic transport time series by a combined inversion of magnetic and gravimetric satellite observations. Hereby, we will focus on the large-scale oceanic circulation. Deriving these transports will crucially improve current estimates of global oceanic mass and heat transports. We will derive trends of major current system as the Antarctic Circumpolar Current (ACC) and the Gulf Stream, i.e., the upper northward arm of the Atlantic Meridional Overturning Circulation (AMOC). We will quantify if still debated climate change related impacts on the current strength can be identified. Furthermore, our estimates of the oceanic transports will be used as independent validation of Earth orientation parameters (EOP) and altimetry-based oceanic transport reanalyzes. Finally, the project will fulfill the open objective of the current ESA mission Swarm: identification and exploitation of magnetic signatures from the oceanic circulation.

• DFG Programme: Research Grants