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Volatile organic compounds (VOC) are precursors of tropospheric pollutants like ozone or aerosols. Emission by agricultural land was still poorly characterised. We report experimental measurements of VOC fluxes above a wheat field with a highly sensitive proton transfer mass spectrometer. We confirm that methanol is the most emitted VOC by wheat. A VOC not reported previously as emitted by crops was the second most emitted here (ion m/z 93.037). Around 70 % of the VOC measured were depositing.
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https://doi.org/10.5194/acp-2020-1328
https://doi.org/10.5194/acp-2020-1328

  13 Jan 2021

13 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

Volatile organic compound fluxes over a winter wheat field by PTR-Qi-TOF-MS and eddy covariance

Benjamin Loubet1, Pauline Buysse1, Lais Gonzaga-Gomez1, Florence Lafouge1, Raluca Ciuraru1, Céline Decuq1, Julien Kammer1,a, Sandy Bsaibes1,2, Christophe Boissard2,3, Brigitte Durand1, Jean-Christophe Gueudet1, Olivier Fanucci1, Olivier Zurfluh1, Letizia Abis1,b, Nora Zannoni2,c, François Truong2, Dominique Baisnée2, Roland Sarda-Estève2, Michael Staudt4, and Valérie Gros2 Benjamin Loubet et al.
  • 1Université Paris-Saclay, UMR ECOSYS, INRAE, AgroParisTech, 78850, Thiverval-Grignon, France
  • 2Laboratoire des Sciences du Climat et de l’Environnement, LSCE, UMR CNRS-CEA-UVSQ, IPSL, 91191 Gifsur-Yvette, Île-de-France, France
  • 3Université de Paris and UPEC, CNRS, LISA, F-94000 Créteil
  • 4Centre d'Ecologie Fonctionnelle et Evolutive UMR 5175, CNRS - Université de Montpellier - Université PaulValéry Montpellier – EPHE Campus CNRS, 1919 Route de Mende, F-34293 Montpellier cedex 5, France
  • anow at: Department of Chemistry and Environmental Research Institute, University College Cork, T12 YN60 Cork, Ireland
  • bnow at: Technische Universität Berlin, Umweltchemie und Luftrinhaltunz, Straße des 17. Juni 135, Berlin, 10623, Germany
  • cnow at: Max-Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany

Abstract. Volatile organic compounds (VOC) contribute to air pollution through the formation of secondary aerosols and ozone and contribute to increasing the lifetime of methane in the atmosphere. Tropospheric VOC are 90 % originating from biogenic sources at the global scale. Forests are the main contributors to these emissions with isoprene and monoterpenes being the most emitted compounds. Crops are also a potentially large, yet poorly characterised, source of VOC. In particular, measurements of VOC fluxes for wheat at the ecosystem scale are scarce, although this is the most cultivated crop in Europe. Available evidence indicates that crops may contribute to 30% of the VOC emissions in Europe, especially oxygenated, low-molecular-weight VOC such as methanol, acetone and acetaldehyde. In this study, which is part of the COV3ER French national project, we investigated VOC fluxes over a wheat field in-situ by eddy covariance using a PTR-Qi-TOF-MS with an outmost sensitivity and mass resolution. We found 264 compounds to have a flux three times above the flux detection limit. Methanol was the most emitted compound, with an averaged flux of 63 µg m−2 h−1, representing around 60 % of summed VOC emissions on a molar basis (40 % on a mass basis). This finding is in line with previous measurements at canopy and plant scales. We also measured acetone, acetaldehyde and dimethyl sulphide among the five most emitted compounds. The second most emitted VOC corresponded to the ion m/z 93.037, tentatively identified as C6H4O. This compound was not reported previously as one of the most emitted compound by terrestrial ecosystems. Summed VOC emissions amounted around 150 µg m−2 h−1. Summed VOC deposition amounted to around −125 µg m−2 h−1, which represented about 70 % of the VOC emissions on a mass basis. The most depositing VOC were tentatively identified as hydroxyacetone and fragments of oxidised VOC with a flux of −16 µg m−2 h−1. Overall, our results reveal that wheat fields represent a non-negligible source and sink of VOC to be considered in regional VOC budgets, and underline the usefulness and limitations of eddy covariance measurements with PTR-Qi-TOF-MS.

Benjamin Loubet et al.

Status: open (until 10 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Benjamin Loubet et al.

Data sets

Volatile Organic Compound (VOC) fluxes and concentrations over a winter wheat field near Paris France. Portail Data INRAE, 2021 B. Loubet et al. https://doi.org/10.15454/IRZ9XX

Benjamin Loubet et al.

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Short summary
Volatile organic compounds (VOC) are precursors of tropospheric pollutants like ozone or aerosols. Emission by agricultural land was still poorly characterised. We report experimental measurements of VOC fluxes above a wheat field with a highly sensitive proton transfer mass spectrometer. We confirm that methanol is the most emitted VOC by wheat. A VOC not reported previously as emitted by crops was the second most emitted here (ion m/z 93.037). Around 70 % of the VOC measured were depositing.
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