Estimation of evapotranspiration of a salt marsh in southern South America with coupled Penman-Monteith and surface resistance models

Gassmann, María Isabel; Tonti, Natalia Edith; Burek, Antonella; Pérez, Claudio F.

doi:10.1016/j.agrformet.2018.12.003

Cited by 14 publications

(1 citation statement)

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“…Since this idealized reference surface is considered time‐invariant, ET o can be directly related to the evaporative demand of the atmosphere and is usually determined from meteorological data observed at a common weather station. Among the methods based on meteorological data for ET o calculation, the Penman–Monteith FAO (PM‐FAO) method is the most robust (Allen et al ., 1998; Barraza Bernadas, 2016; Gassmann et al ., 2019). PM‐FAO estimates evapotranspiration through the partitioning of available energy at the surface.…”

Section: Introductionmentioning

confidence: 99%

Trends of reference evapotranspiration and its physical drivers in southern South America

Merino

Gassmann

2022

Intl Journal of Climatology

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Reference evapotranspiration (ETo) is a variable used to characterize the evaporative demand of the atmosphere and its impact on the water balance. During the last decades, significant ETo variabilities have been observed, especially at mid‐latitudes. These variabilities respond mainly to local variations in their physical drivers, such as solar radiation, vapour pressure deficit or wind speed. In this study, the annual and seasonal ETo estimates are generated using the Penman–Monteith method (FAO). Surface weather stations for the Argentine territory and reanalysis data for southern South America of the last four decades (1981–2020) are used. Contributions of both aerodynamic (ETaero) and radiative (ETrad) effects are evaluated to analyse their driving role. Significant positive ETo trends are observed from reanalysis data throughout Argentina, especially on the central east side of the Andes Mountain range with values up to 10 mm·year−1. Most of these ETo changes respond to positive trends in air temperature in the study area, while those in the central Andes also respond to negative trends in dew point temperatures. On the other hand, the increase in energy availability through positive trends in net surface radiation produced a slightly higher ETo in the northern regions of the country. Regional ETo values have shown to be more sensitive to variations in air temperature in the northeastern areas, although changes in humidity and solar radiation could also play a role. In a context of climate change, given that temperature and rainfall are expected to increase in the central and northeastern region of the country and decrease along the eastern side of the Andes Mountains in the coming decades, the characteristics observed over the 1981–2020 period are expected to intensify in the near future.

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Section: Introductionmentioning

confidence: 99%