Preprints
https://doi.org/10.5194/egusphere-2023-2438
https://doi.org/10.5194/egusphere-2023-2438
09 Jan 2024
 | 09 Jan 2024

First measurements of ecosystem-scale biogenic volatile organic compound fluxes over rapeseed reveal more significant terpenoid emissions than expected

Pauline Buysse, Benjamin Loubet, Raluca Ciuraru, Florence Lafouge, Brigitte Durand, Olivier Zurfluh, Céline Décuq, Olivier Fanucci, Lais Gonzaga Gomez, Jean-Christophe Gueudet, Sandy Bsaibes, Nora Zannoni, and Valérie Gros

Abstract. Biogenic volatile organic compounds (BVOCs) play a large role in atmospheric chemistry as they are precursors of ozone and secondary organic aerosols. However, the analysis of their emission in croplands is scarce. This work constitutes, to our knowledge, the first quantification of ecosystem-scale biogenic volatile organic compounds (BVOC) fluxes exchanged over a rapeseed crop field. The experimental campaign took place at the FR-Gri ICOS site (near Paris, France) between spring and summer 2017, during which the BVOC fluxes were measured continuously by the eddy-covariance method with a proton-transfer quad-injection time-of-flight mass-spectrometer instrument (PTR-Qi-TOF-MS). Standard emission factors (SEF) and OH reactivity fluxes were computed from the measured fluxes, and compared to the widely used model MEGAN2.1. Fifty-three BVOCs were significantly emitted or deposited during the campaign. Methanol was by far the most emitted one (83 to 91 % of summed emissions), followed by ethanol (1.5 to 11 %) and monoterpenes (1.2 to 1.6 %). Methanol SEF appeared to be overestimated during vegetation stages in MEGAN2.1. In addition, a 4-fold increase of emissions during the late senescence stage confirmed the necessity to use the ageing factor to represent methanol emissions in MEGAN2.1. Most noticeably, monoterpenes SEF computed in this study were 3 to 90 times larger than with MEGAN2.1. Consequently, this study shows that the share of OH reactivity represented by terpenoid compounds was underestimated in previous studies, pointing out the potentially more significant contribution of croplands to secondary organic aerosol formation.

Pauline Buysse, Benjamin Loubet, Raluca Ciuraru, Florence Lafouge, Brigitte Durand, Olivier Zurfluh, Céline Décuq, Olivier Fanucci, Lais Gonzaga Gomez, Jean-Christophe Gueudet, Sandy Bsaibes, Nora Zannoni, and Valérie Gros

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2438', Anonymous Referee #1, 30 Jan 2024
  • RC2: 'Comment on egusphere-2023-2438', Anonymous Referee #2, 07 Feb 2024
  • AC1: 'Comment on egusphere-2023-2438', Pauline Buysse, 19 Feb 2024
Pauline Buysse, Benjamin Loubet, Raluca Ciuraru, Florence Lafouge, Brigitte Durand, Olivier Zurfluh, Céline Décuq, Olivier Fanucci, Lais Gonzaga Gomez, Jean-Christophe Gueudet, Sandy Bsaibes, Nora Zannoni, and Valérie Gros
Pauline Buysse, Benjamin Loubet, Raluca Ciuraru, Florence Lafouge, Brigitte Durand, Olivier Zurfluh, Céline Décuq, Olivier Fanucci, Lais Gonzaga Gomez, Jean-Christophe Gueudet, Sandy Bsaibes, Nora Zannoni, and Valérie Gros

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Short summary
This research aimed at quantifying biogenic volatile organic compounds (BVOCs) emissions by a rapeseed crop field. Such compounds are precursors of atmospheric pollutants. Our study revealed that methanol, a BVOC that is not very reactive in the atmosphere, is by far the most emitted BVOC, while monoterpenes, being highly reactive, were emitted in larger quantities than expected. Our study therefore points out the potentially more significant contribution of croplands to atmospheric pollution.