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Article

Impact of Drought on Isoprene Fluxes Assessed Using Field Data, Satellite-Based GLEAM Soil Moisture and HCHO Observations from OMI

1
Royal Belgian Institute for Space Aeronomy (BISA), Avenue Circulaire 3, 1180 Brussels, Belgium
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Hydro-Climate Extremes Lab (H-CEL), Department of Environment, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
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Remote Sensing, SpacesenseAI, Rue Jean-Jacques Rousseau 62, 75001 Paris, France
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Environmental Science and Studies, DePaul University, 1110 W Belden Ave., Chicago, IL 60614, USA
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Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Carrer Jordi Girona 18-26, 08034 Barcelona, Spain
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Department of Earth System Science, University of California Irvine, 3216 Croul Hall, Irvine, CA 92697-3100, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Bas van Wesemael
Remote Sens. 2022, 14(9), 2021; https://doi.org/10.3390/rs14092021
Received: 10 January 2022 / Revised: 1 April 2022 / Accepted: 19 April 2022 / Published: 22 April 2022
(This article belongs to the Special Issue Innovative Belgian Earth Observation Research for the Environment)
Biogenic volatile organic compounds (BVOCs), primarily emitted by terrestrial vegetation, are highly reactive and have large effects on the oxidizing potential of the troposphere, air quality and climate. In terms of global emissions, isoprene is the most important BVOC. Droughts bring about changes in the surface emission of biogenic hydrocarbons mainly because plants suffer water stress. Past studies report that the current parameterization in the state-of-the-art Model of Emissions of Gases and Aerosols from Nature (MEGAN) v2.1, which is a function of the soil water content and the permanent wilting point, fails at representing the strong reduction in isoprene emissions observed in field measurements conducted during a severe drought. Since the current algorithm was originally developed based on potted plants, in this study, we update the parameterization in the light of recent ecosystem-scale measurements of isoprene conducted during natural droughts in the central U.S. at the Missouri Ozarks AmeriFlux (MOFLUX) site. The updated parameterization results in stronger reductions in isoprene emissions. Evaluation using satellite formaldehyde (HCHO), a proxy for BVOC emissions, and a chemical-transport model, shows that the adjusted parameterization provides a better agreement between the modelled and observed HCHO temporal variability at local and regional scales in 2011–2012, even if it worsens the model agreement in a global, long-term evaluation. We discuss the limitations of the current parameterization, a function of highly uncertain soil properties such as porosity. View Full-Text
Keywords: BVOCs; isoprene; formaldehyde; drought; Ozarks; Missouri; MEGAN; GLEAM; OMI BVOCs; isoprene; formaldehyde; drought; Ozarks; Missouri; MEGAN; GLEAM; OMI
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MDPI and ACS Style

Opacka, B.; Müller, J.-F.; Stavrakou, T.; Miralles, D.G.; Koppa, A.; Pagán, B.R.; Potosnak, M.J.; Seco, R.; De Smedt, I.; Guenther, A.B. Impact of Drought on Isoprene Fluxes Assessed Using Field Data, Satellite-Based GLEAM Soil Moisture and HCHO Observations from OMI. Remote Sens. 2022, 14, 2021. https://doi.org/10.3390/rs14092021

AMA Style

Opacka B, Müller J-F, Stavrakou T, Miralles DG, Koppa A, Pagán BR, Potosnak MJ, Seco R, De Smedt I, Guenther AB. Impact of Drought on Isoprene Fluxes Assessed Using Field Data, Satellite-Based GLEAM Soil Moisture and HCHO Observations from OMI. Remote Sensing. 2022; 14(9):2021. https://doi.org/10.3390/rs14092021

Chicago/Turabian Style

Opacka, Beata, Jean-François Müller, Trissevgeni Stavrakou, Diego G. Miralles, Akash Koppa, Brianna R. Pagán, Mark J. Potosnak, Roger Seco, Isabelle De Smedt, and Alex B. Guenther. 2022. "Impact of Drought on Isoprene Fluxes Assessed Using Field Data, Satellite-Based GLEAM Soil Moisture and HCHO Observations from OMI" Remote Sensing 14, no. 9: 2021. https://doi.org/10.3390/rs14092021

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