IAHS2022-366
https://doi.org/10.5194/iahs2022-366
IAHS-AISH Scientific Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Analysis influence of evapotranspiration on superconducting gravity signal at daily time step

Bertille Loiseau1, Simon Carriere1, Cédric Champollion2, Chloé Ollivier3, Nicolas Martin-StPaul4, Nolwenn Lesparre5, Albert Olioso4, Jacques Hinderer5, and Damien Jougnot1
Bertille Loiseau et al.
  • 1Sorbonne University, Paris, France (simon.carriere@upmc.fr)
  • 2Université de Montpellier, Montpellier, France (cedric.champollion@umontpellier.fr)
  • 3Institut de recherche pour le developpement, Toulouse, France (chloe.ollivier@ird.fr)
  • 4Intitut national de la recherche agronomique et environnement, Avignon, France (nicolas.martin@inrae.fr)
  • 5Centre natiuonal de la recherche scientifique, Strasbourg, France (lesparre@unistra.fr)

Estimating evapotranspiration (ET) is a primary challenge in modern hydrology. Hydrogravimetry is an integrative approach that provides highly precise continuous measurement of gravity acceleration. However, large-scale effects (e.g. tides, polar motion, atmospheric loading) limit the fine time-scale interpretation of this data and processing leads to residual signal noise. To circumvent this limitation, we exploited the difference between two superconducting gravimeters located 512 m apart on the same vertical. The difference calculation makes it possible to remove shared large-scale effects. Daily variation of this gravity difference is significantly correlated with daily evapotranspiration as estimated using the water balance model SimpKcET (p-value = 4.10-10). However, this approach is effective only during rain-free periods. In the future, comparison with direct ET measurements (e.g. eddy-covariance, scintillometer) may confirm and strengthen our interpretation. Improved hydrogravimetric data processing will allow to extend this approach to other experimental sites equipped with a single superconducting gravimeter.

How to cite: Loiseau, B., Carriere, S., Champollion, C., Ollivier, C., Martin-StPaul, N., Lesparre, N., Olioso, A., Hinderer, J., and Jougnot, D.: Analysis influence of evapotranspiration on superconducting gravity signal at daily time step, IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-366, https://doi.org/10.5194/iahs2022-366, 2022.