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Article

Performance of Satellite-Based Evapotranspiration Models in Temperate Pastures of Southern Chile

1
Laboratory for Analysis of the Biosphere (LAB), University of Chile, Santiago 1030000, Chile
2
Laboratory of Geosciences, University of Aysén, Calle Obispo Vielmo N_62, Coyhaique 5952039, Chile
3
Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile, Valdivia 5090000, Chile
4
Laboratoire des Sciences du Climat et de l’Environnement, IPSL, CNRS/CEA/UVSQ, 91191 Gif sur Yvette, France
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3587; https://doi.org/10.3390/w12123587
Received: 19 November 2020 / Revised: 9 December 2020 / Accepted: 10 December 2020 / Published: 21 December 2020
(This article belongs to the Section Water, Agriculture and Aquaculture)
Farmers in the temperate zone of southern Chile have started to irrigate historically rainfed pastures during recent years to reduce dairy productivity losses against increasingly severe summer droughts. The lack of information on pasture water requirements (i.e., evapotranspiration), however, hampers the implementation of efficient irrigation programs. Here, we use in-situ observations to evaluate the skill of four remote sensing Surface Energy Balance (SEB) models and two satellite-based global evapotranspiration products (PML_V2 and GLEAM) to estimate actual evapotranspiration (ETa) of pastures in southern Chile during 2014–2017. Daily ETa measured at an evaluation site over the period ranges between 1.2 mm and 6.2 mm day−1 during the growing season (October–March), with an annual maximum of about 4.8 mm day−1 in January and a minimum 0.6 mm day−1 in June. Only the Simplified SEB (SEBS) model and its operational variant (SSEBop) and the PML_V2 global evapotranspiration product perform well, capturing 63–79% of the variance of in-situ evapotranspiration with an error between 0.75 mm day−1 and 1.1 mm day−1. The readily available PML_V2 product can be used as a convenient way to determine average water footprint of pastures and the two SEBs models can be implemented to monitor irrigation requirements in near-real time from field to regional scales. These results demonstrated a high potential of satellite observations for monitoring evapotranspiration and quantify the water footprint of pastures in southern Chile for a sustainable irrigation practice. View Full-Text
Keywords: evapotranspiration; GLEAM; PML_V2; pasture; grassland; remote sensing; Chile evapotranspiration; GLEAM; PML_V2; pasture; grassland; remote sensing; Chile
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MDPI and ACS Style

Moletto-Lobos, I.; Mattar, C.; Barichivich, J. Performance of Satellite-Based Evapotranspiration Models in Temperate Pastures of Southern Chile. Water 2020, 12, 3587. https://doi.org/10.3390/w12123587

AMA Style

Moletto-Lobos I, Mattar C, Barichivich J. Performance of Satellite-Based Evapotranspiration Models in Temperate Pastures of Southern Chile. Water. 2020; 12(12):3587. https://doi.org/10.3390/w12123587

Chicago/Turabian Style

Moletto-Lobos, Italo, Cristian Mattar, and Jonathan Barichivich. 2020. "Performance of Satellite-Based Evapotranspiration Models in Temperate Pastures of Southern Chile" Water 12, no. 12: 3587. https://doi.org/10.3390/w12123587

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