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

Abstract

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 then 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 furthermore » 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.« less

Authors:
 [1];  [1];  [2];  [3];  [2];  [4];  [5];  [6]; ORCiD logo [7];  [2];  [8];  [1];  [1]
  1. Autonomous Univ. of Barcelona, Bellaterra (Spain). Spanish National Research Council (CSIC), Centre for Research on Ecology and Forestry Applications (CREAF) and Global Ecology Unit
  2. Univ. of California, Irvine, CA (United States). Dept. of Earth System Science
  3. DePaul Univ., Chicago, IL (United States). Dept. of Environmental Science and Studies
  4. Univ. of Innsbruck (Austria). Inst. of Atmospheric and Cryospheric Sciences
  5. Univ. of Nebraska, Lincoln, NE (United States). School of Natural Resources
  6. Univ. of Missouri, Columbia, MO (United States). Dept. of Forestry
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Autonomous Univ. of Barcelona, Bellaterra (Spain). Spanish National Research Council (CSIC), Centre for Research on Ecology and Forestry Applications (CREAF) and Global Ecology Unit; Univ. of Antwerp (Belgium). Center of Excellence Plants and Ecosystems (PLECO) and Dept. of Biology
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); European Research Council (ERC); Spanish Government; Catalan Government; Chinese Scholarship Council (CSC); Belgian Federal Science Policy Office (BELSPO); European Union (EU)
OSTI Identifier:
1474481
Grant/Contract Number:  
AC05-00OR22725; SyG-2013-610028 IMBALANCE-P; CGL2016-79835-P; SGR 2014-274; 76108—INDRO; SR/00/322
Resource Type:
Accepted Manuscript
Journal Name:
Remote Sensing
Additional Journal Information:
Journal Volume: 10; Journal Issue: 4; Journal ID: ISSN 2072-4292
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; drought; GPP; isoprene; LUE; MEGAN; MODIS; PRI; photorespiration; reducing power; substrate availability

Citation Formats

Filella, Iolanda, Zhang, Chao, Seco, Roger, Potosnak, Mark, Guenther, Alex, Karl, Thomas, Gamon, John, Pallardy, Stephen, Gu, Lianhong, Kim, Saewung, Balzarolo, Manuela, Fernandez-Martinez, Marcos, and Penuelas, Josep. A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest. United States: N. p., 2018. Web. doi:10.3390/rs10040557.
Filella, Iolanda, Zhang, Chao, Seco, Roger, Potosnak, Mark, Guenther, Alex, Karl, Thomas, Gamon, John, Pallardy, Stephen, Gu, Lianhong, Kim, Saewung, Balzarolo, Manuela, Fernandez-Martinez, Marcos, & Penuelas, Josep. A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest. United States. doi:10.3390/rs10040557.
Filella, Iolanda, Zhang, Chao, Seco, Roger, Potosnak, Mark, Guenther, Alex, Karl, Thomas, Gamon, John, Pallardy, Stephen, Gu, Lianhong, Kim, Saewung, Balzarolo, Manuela, Fernandez-Martinez, Marcos, and Penuelas, Josep. Wed . "A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest". United States. doi:10.3390/rs10040557. https://www.osti.gov/servlets/purl/1474481.
@article{osti_1474481,
title = {A MODIS Photochemical Reflectance Index (PRI) as an Estimator of Isoprene Emissions in a Temperate Deciduous Forest},
author = {Filella, Iolanda and Zhang, Chao and Seco, Roger and Potosnak, Mark and Guenther, Alex and Karl, Thomas and Gamon, John and Pallardy, Stephen and Gu, Lianhong and Kim, Saewung and Balzarolo, Manuela and Fernandez-Martinez, Marcos and Penuelas, Josep},
abstractNote = {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 then 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.},
doi = {10.3390/rs10040557},
journal = {Remote Sensing},
number = 4,
volume = 10,
place = {United States},
year = {2018},
month = {4}
}

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