Comparisons of observed and modeled elastic responses to hydrological loading in the Amazon basin

D. Moreira (1) , S. Calmant (1) , Félix Perosanz (2) , L. Xavier (1) , O. C. Rotunno Filho , F. Seyler (3) , A. C. Monteiro

1 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
2 CNES - Centre National d'Études Spatiales [Toulouse]
3 UMR 228 Espace-Dev, Espace pour le développement

In large hydrological basins, water mass loading can produce significant crustal deformation. We compare the monthly vertical component of 18 GPS sites located in the Amazon basin, with the deflection models derived from Gravity Recovery and Climate Experiment (GRACE) observations on the one hand and derived from HYDL, a global hydrological model, on the other hand. The GPS data set includes the largest deflections by hydrological loading ever recorded at two stations located in the center of the basin. The main result of the study is that the GRACE solution produced by GRGS (Groupe de Recherche en Géodesie Spatiale, Toulouse, France) produces the best agreement with the Global Navigation Satellite Systems series with a correlation coefficient up to 0.9 in the center of the basin, although 70% at best of the RMS variation in the GPS series is accounted for.

Domaines: Géophysique [physics.geo-ph]; Interfaces continentales, environnement

D. Moreira, S. Calmant, Félix Perosanz, L. Xavier, O. C. Rotunno Filho, et al.. Comparisons of observed and modeled elastic responses to hydrological loading in the Amazon basin. Geophysical Research Letters, 2016, 43 (18), pp.9604 - 9610. ⟨10.1002/2016GL070265⟩. ⟨hal-01671052⟩