Double séminaire : GRACE, the gravity-field variations for new insights into the Earth’s core / MAGIC — The impact of future satellite gravimetry missions on the resolvability of climate signals in the global mass transport

– Hugo Lecomte, Legos, anciennement doctorant à l’ITES –

Résumé :

This presentation introduces the principles of the current satellite gravimetry missions, GRACE and GRACE Follow-On. In addition to their ability to measure the global water cycle, space gravimetry can be valuable for exploring Earth’s core dynamics. The convective motions of the fluid core, which generate the magnetic field, are subject to perturbations, causing variations in density and pressure that lead to variations in the gravity field. GRACE time-variable gravity field estimation enables to constraint Earth interior processes such as the inner-core differential rotation.

– Marius Schlaak, Technical University of Munich, TUM School of Engineering and Design, Chair for Astronomical and Physical Geodesy, Munich, Germany –

Résumé :

This presentation gives an overview of the planned MAGIC mission and shows the results of multi-decadal closed-loop simulations of current and future satellite gravity observations. It displays the benefit of an increased duration of the observation and an improved observational system while comparing processing strategies for long-term trends in ocean mass changes and continental hydrology. The observed climate signal is based on projections of mass change signals of oceans, hydrology, ice sheets, and glaciers derived from CMIP6 climate projection under a shared socio-economic pathway scenario without drastic reduction of Greenhouse gas emissions (SSP5-8.5). The resulting long-term trends in ocean heat content and hydrology are then compared to initial inputs to the simulation to illustrate the difference in performance between current and future satellite gravity constellations.

Lien Zoom :

https://cnrs.zoom.us/j/97437381848?pwd=TWlxSklQUWNEZk1Da1FjU09HekNhZz09