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Remote Sens. 2018, 10(4), 557;

A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest

Consejo Superior de Investigaciones Científicas (CSIC), Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain
CREAF, 08193 Cerdanyola del Vallès, Catalonia, Spain
Department of Earth System Science, University of California, Irvine, CA 92697, USA
Department of Environmental Science and Studies, DePaul University, Chicago, IL 60614, USA
Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, A-6020 Innsbruck, Austria
School of Natural Resources, University of Nebraska, Lincoln, NE 68583-0988, USA
Department of Forestry, University of Missouri, Columbia, MO 65211, USA
Oak Ridge National Lab., Oak Ridge, TN 37830, USA
Center of Excellence PLECO, Biology Department, University of Antwerp, BE-2610 Wilrijk, Belgium
Author to whom correspondence should be addressed.
Received: 24 January 2018 / Revised: 15 March 2018 / Accepted: 30 March 2018 / Published: 4 April 2018
(This article belongs to the Section Land Surface Fluxes)
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The quantification of isoprene and monoterpene emissions at the ecosystem level with available models and field measurements is not entirely satisfactory. Remote-sensing techniques can extend the spatial and temporal assessment of isoprenoid fluxes. Detecting the exchange of biogenic volatile organic compounds (BVOCs) using these techniques is, however, a very challenging goal. Recent evidence suggests that a simple remotely sensed index, the photochemical reflectance index (PRI), which is indicative of light-use efficiency, relative pigment levels and excess reducing power, is a good indirect estimator of foliar isoprenoid emissions. We tested the ability of PRI to assess isoprenoid fluxes in a temperate deciduous forest in central USA throughout the entire growing season and under moderate and extreme drought conditions. We compared PRI time series calculated with MODIS bands to isoprene emissions measured with eddy covariance. MODIS PRI was correlated with isoprene emissions for most of the season, until emissions peaked. MODIS PRI was also able to detect the timing of the annual peak of emissions, even when it was advanced in response to drought conditions. PRI is thus a promising index to estimate isoprene emissions when it is complemented by information on potential emission. It may also be used to further improve models of isoprene emission under drought and other stress conditions. Direct estimation of isoprene emission by PRI is, however, limited, because PRI estimates LUE, and the relationship between LUE and isoprene emissions can be modified by severe stress conditions. View Full-Text
Keywords: drought; GPP; isoprene; LUE; MEGAN; MODIS; PRI; photorespiration; reducing power; substrate availability drought; GPP; isoprene; LUE; MEGAN; MODIS; PRI; photorespiration; reducing power; substrate availability

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Filella, I.; Zhang, C.; Seco, R.; Potosnak, M.; Guenther, A.; Karl, T.; Gamon, J.; Pallardy, S.; Gu, L.; Kim, S.; Balzarolo, M.; Fernandez-Martinez, M.; Penuelas, J. A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest. Remote Sens. 2018, 10, 557.

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