@article{fdi:010078993,
  title = {{A} study of the monsoonal hydrology contribution using a 8-yr record (2010-2018) from superconducting gravimeter {OSG}-060 at {D}jougou ({B}enin, {W}est {A}frica)},
  author = {{H}inderer, {J}. and {H}ector, {B}asile and {R}iccardi, {U}. and {R}osat, {S}. and {B}oy, {J}. {P}. and {C}alvo, {M}. and {L}ittel, {F}. and {B}ernard, {J}. {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e analyse a nearly 8-yr record (2010-2018) of the superconducting gravimeter {OSG}-060 located at {D}jougou ({B}enin, {W}est {A}frica). {A}fter tidal analysis removing all solid {E}arth and ocean loading tidal contributions and correcting for the long-term instrumental drift and atmospheric loading, we obtain a gravity residual signal which is essentially a hydrological signal due to the monsoon. {T}his signal is first compared to several global hydrology models ({ERA}, {GLDAS} and {MERRA}). {O}ur superconducting gravimeter residual signal is also superimposed onto episodic absolute gravity measurements and to space gravimetry {GRACE} data. {A} further comparison is done using local hydrological data like soil moisture in the very superficial layer (0-1.2 m), water table depth and rainfall. {T}he temporal evolution of the correlation coefficient between the gravity observation and both the soil moisture and the water table is well explained by the direct infiltration process of rain water together with the lateral transfer discharging the water table. {F}inally, we compute the water storage changes ({WSC}) using a simulation based on the physically based {P}arflow-{CLM} numerical model of the catchment, which solves the water and energy budget from the impermeable bedrock to the top of the canopy layer using the 3-{D} {R}ichards equation for the water transfers in the ground, the kinematic wave equation for the surface runoff and a land surface model ({CLM}) for the energy budget and evapotranspiration calculation. {T}his model forced by rain is in agreement with evapotranspiration and stream flow data and leads to simulated water storage changes that nicely fit to the observed gravity signal. {T}his study points out the important role played by surface gravity changes in terms of a reliable proxy for water storage changes occurring in small catchments.},
  keywords = {{T}ime variable gravity ; {A}frica ; {H}ydrology ; loading ; monsoon ; {BENIN} ; {DJOUGOU}},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {221},
  numero = {1},
  pages = {431--439},
  ISSN = {0956-540{X}},
  year = {2020},
  DOI = {10.1093/gji/ggaa027},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078993},
}