A MODIS photochemical reflectance index (PRI) as an estimator of isoprene emissions in a temperate deciduous forest - Filella, Iolanda (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Zhang, Chao (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Seco, Roger (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Potosnak, Mark (DePaul University. Department of Environmental Science and Studies) ; Guenther, Alex (University of California. Department of Earth System Science) ; Karl, Thomas (University of Innsbruck. Institute of Atmospheric and Cryospheric Sciences) ; Gamon, John A. (University of Nebraska-Lincoln. School of Natural Resources) ; Pallardy, Stephen (University of Missouri. Department of Forestry) ; Gu, Lianhong (Oak Ridge National Laboratory. Environmental Sciences Division) ; Kim, Saewung (University of California. Department of Earth System Science) ; Balzarolo, Manuela (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Fernández-Martínez, Marcos (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)