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Direct measurement of evapotranspiration from a forest using a superconducting gravimeter

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Van Camp, Michel [Observatoire Royal de Belgique] de Viron, Olivier [Université La Rochelle et CNRS (France)] Pajot-Métivier, Gwendoline [IGN et Université de Paris Diderot (France)] Casenave, Fabien [IGN et Université de Paris Diderot (France)] Watlet, Arnaud [Université de Mons et Observatoire Royal de Belgique] Vanclooster, Marnik [UCL]

Evapotranspiration (ET) controls the flux between the land surface and the atmosphere. Assessing the ET ecosystems remains a key challenge in hydrology. We have found that the ET water mass loss can be directly inferred from continuous gravity measurements: as water evaporates and transpires from terrestrial ecosystems, the mass distribution of water decreases, changing the gravity field. Using continuous superconducting gravity measurements, we were able to identify daily gravity changes at the level of, or smaller than 10-9 nm.s-2 (or 10-10 g) per day. This corresponds to 1.7 mm of water over an area of 50 ha. The strength of this method is its ability to enable a direct, traceable and continuous monitoring of actual ET for years at the mesoscale with a high accuracy

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2016
Language Anglais
Journal information "Geophysical Research Letters" - Vol. 43 (2016)
Peer reviewed yes
Publisher Wiley-Blackwell Publishing, Inc. (Hoboken)
issn 0094-8276
e-issn 1944-8007
Publication status Publié
Affiliation UCL - SST/ELI/ELIE - Environmental Sciences
Keywords Evapotranspiration ; Gravimeter ; Membach ; Observatoire Royal de Belgique ; 3615
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Bibliographic reference Van Camp, Michel ; de Viron, Olivier ; Pajot-Métivier, Gwendoline ; Casenave, Fabien ; Watlet, Arnaud ; et. al. Direct measurement of evapotranspiration from a forest using a superconducting gravimeter. In: Geophysical Research Letters, Vol. 43 (2016)
Permanent URL http://hdl.handle.net/2078.1/176805