Publications

Sanchez-Ruiz, S; Moreno, A; Piles, M; Maselli, F; Carrara, A; Running, S; Gilabert, MA (2017). Quantifying water stress effect on daily light use efficiency in Mediterranean ecosystems using satellite data. INTERNATIONAL JOURNAL OF DIGITAL EARTH, 10(6), 623-638.

Abstract
The capacity of six water stress factors (epsilon(i)) to track daily light use efficiency (epsilon) of water-limited ecosystems was evaluated. These factors are computed with remote sensing operational products and a limited amount of ground data: epsilon(1) uses ground precipitation and air temperature, and satellite incoming global solar radiation; epsilon(2) uses ground air temperature, and satellite actual evapotranspiration and incoming global solar radiation; epsilon(3) uses satellite actual and potential evapotranspiration; epsilon(4) uses satellite soil moisture; epsilon(5) uses satellite-derived photochemical reflectance index; and epsilon(6) uses ground vapor pressure deficit. These factors were implemented in a production efficiency model based on Monteith's approach in order to assess their performance for modeling gross primary production (GPP). Estimated GPP was compared to reference GPP from eddy covariance (EC) measurements (GPP(EC)) in three sites placed in the Iberian Peninsula (two open shrublands and one savanna). epsilon(i) were correlated to epsilon, which was calculated by dividing GPP(EC) by ground measured photosynthetically active radiation (PAR) and satellite-derived fraction of absorbed PAR. Best results were achieved by epsilon(1), epsilon(2), epsilon(3) and epsilon(4) explaining around 40% and 50% of epsilon variance in open shurblands and savanna, respectively. In terms of GPP, R-2 approximate to 0.70 were obtained in these cases.

DOI:
10.1080/17538947.2016.1247301

ISSN:
1753-8947