Assessing Height Variations in Qinghai-Tibet Plateau from Time-Varying Gravity Data and Hydrological Model

Height variations caused by mass change make an important contribution to the tectonic uplift of Qinghai-Tibet Plateau (QTP). To study deformation attributable hydrological loading and real potential vertical motion, satellite gravity data from Gravity Recovery Climate Experiment (GRACE) GRACE Follow-On (GRACE-FO) with Global Land Data Assimilation System (GLDAS) Positioning (GPS) are adopted estimate height in QTP. Based on spherical harmonic function (SHF) Green’s (GF), results show trend is unevenly distributed spatial domain. The SHF indicated that rate southwest QTP ~1 mm/year, while northern eastern a subtle decreasing trend, which indicates not main cause observed GRACE. maximum annual amplitude ~12 mm, reaching around February March. average correlation coefficients SHF, GF GPS heights 0.70 0.82, respectively. cross wavelet transform, it concluded there signals between derived (-FO) GLDAS. Finally, motion given removing effect loading, shows most stations uplifted at 0.06 mm/year–1.97 mm/year.