Estimating cumulative evapotranspiration using superconducting gravimeter data: a study in Buenos Aires Province, Argentina

A new method for estimating cumulative evapotranspiration using superconducting gravimeter data is presented. Evapotranspiration is computed from the classical water balance equation using precipitation data, estimated runoff, and water storage assessed from temporal variations of gravity. The gravi...

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Bibliographic Details
Published in:Hydrological sciences journal 2023-11, Vol.68 (15), p.2262-2275
Main Authors: Pendiuk, Jonatan E., Guarracino, Luis, Reich, Marvin, Güntner, Andreas
Format: Article
Language:English
Subjects:
Aeration zone
Buenos Aires flatlands
cumulative evapotranspiration
Evapotranspiration
Evapotranspiration estimates
Gravimeters
gravity changes
Gravity meters
Gravity variations
Hydrologic data
MODIS
Moisture content
Numerical models
Precipitation data
Runoff
Soil
Soil moisture
Soil moisture measurements
Soil stresses
Soil water
superconducting gravimeter
Superconductivity
Temporal variations
Unsaturated flow
Water balance
water balance budget
Water flow
Water storage
Water stress
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Summary:A new method for estimating cumulative evapotranspiration using superconducting gravimeter data is presented. Evapotranspiration is computed from the classical water balance equation using precipitation data, estimated runoff, and water storage assessed from temporal variations of gravity. The gravity-based methodology is applied to a study site located at the Argentinian–German Geodetic Observatory (AGGO) in the flatland area of Buenos Aires Province (Argentina), which houses the only superconducting gravimeter in South America. For the period from April 2017 to May 2018, the cumulative evapotranspiration is estimated at 710.7 ± 25.7 mm. Evapotranspiration values are successfully compared with estimates provided by three methods, based on the water balance equation using soil moisture data, the numerical modelling of water flow in the unsaturated zone and the MODIS product (MOD16A2). The analysis of evapotranspiration also allows us to identify a period of soil water stress which is validated by soil moisture measurements.
ISSN:0262-6667
2150-3435
DOI:10.1080/02626667.2023.2264283