Satellite Laser Ranging (SLR) data have been analyzed by ourselves and other groups to provide e~imstes of the secular variations in the zonal harmonics of the geopotential field. While the SLR data available frum late-1992 onward me superior in satellite and temporal coverage (two station shifts in operation by the NASA Network), SLR alma extending back to the mid-1970s have been utilized by s...

Abstract To develop a gravimetric geoid, Global Geopotential Model (GGM) is required to minimise the truncation error arising from using Stokes integral with limited number of gravity data points. The choice best-fitting GGM determines accuracy geoid solution. Selecting suitable rigorous process, requiring both internal and external evaluation all GGMs available at International Center for Glob...

�e correlation between increasedWest African monsoon rainfall and anomalously low surface pressure over the Sahara is well established in observations and global climatemodels, and has been interpreted as a strengthening of the Saharan Heat Low (SHL) during wet monsoon years.�is study uses two atmospheric reanalysis datasets to examine interannual variability of Sahel rainfall and the shallow S...

The development of the global geopotential model (GGM) broadens its applications in ocean science, which emphasizes importance for assessment. We assess recently released high-degree GGMs over South China Sea through heterogeneous geodetic observations and synthetic/ocean reanalysis data. comparisons with a high resolution (∼3 km) airborne gravimetric survey Paracel Islands show that XGM2019e_2...

We present and characterize the performance of a new remote sensing concept extrapolated from the GPS occultation concept in which we choose the signal frequencies to determine profiles of atmospheric water, ozone, temperature, geopotential of atmospheric pressure surfaces and clouds.

The Lense-Thirring effect is currently being measured by means of a combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and the perigee of LAGEOS II. The claimed total error should be of the order of 20%. The most insidious systematic error is due to the mismodelled even zonal harmonics of the geopotential and amounts to 12.9%, according to the full covariance matrix of th...