资源环境科技发展态势分析平台

The intersatellite range measurements between the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) satellite pair enable mapping time variations in Earth’s gravity field. The Laser Ranging Interferometer (LRI) and Microwave Instrument (MWI) provide independent range measurements. We compare gravity fields derived from the two instruments. The LRI captures time-variable gravity field signals up to 21 mHz (165 km half-wavelength) globally, while MWI reaches frequencies up to 15 mHz (230 km). Time-variable mass variations free from annual cycles and trends are sensed up to 15 mHz (LRI) and 11 mHz (320 km) (MWI). Both instruments are shown to be excellent tools for detection and monitoring of sub-monthly geophysical signals. Along-track global maps of sub-monthly signals are expected to shed light on the high-frequency behavior of a large number of geophysical processes.