Ecosystem-scale biogenic volatile organic compound fluxes over rapeseed by eddy-covariance
Abstract
Biogenic volatile organic compounds (BVOCs) are key precursors of ozone and secondary organic aerosols, yet their emissions from croplands remain poorly characterized. Here, we report what is, to our knowledge, the first ecosystem-scale quantification of BVOC fluxes over a rapeseed crop during fruit development and senescence. Measurements were conducted at the FR-Gri ICOS site near Paris (France) in May-June 2017 using eddy covariance with a proton-transfer-reaction quadrupole ion guide time-of-flight mass spectrometer (PTR-Qi-TOF-MS). In total, 42 BVOCs were significantly emitted or deposited. Methanol dominated emissions during fruit development (about 90 % of total molar flux), followed by monoterpenes, acetone, and isoprene. During senescence, formaldehyde and methanethiol emerged as additional contributors and emission fluxes of oxygenated compounds like methanol, acetone, acetaldehyde, formaldehyde, formic acid and acetic acid were larger than during the fruit development period. Deposition fluxes over both periods were mainly attributed to formic acid (about 50 %), with smaller contributions from other oxygenated BVOCs. Several BVOCs, including formaldehyde and acetic acid, exhibited bidirectional fluxes. Besides, our findings show that the oxygenated BVOC SEFs, that were calculated in the present study with a slightly modified version of the MEGAN2.1 equations, were generally smaller than what is estimated in MEGAN2.1, while terpenoid BVOCs (isoprene, monoterpenes) SEFs may be underestimated in that model. Finally, our study points out that the contribution to total OH reactivity is mostly due to terpenoids (about 40 %), which suggests a larger role of croplands in secondary organic aerosol formation than currently represented in models. a SEF calculated with the equation proposed by Guenther et al. (2012), considering the adjustements detailed in Sect. 2.4.3. b Values from Guenther et al. (2012). c Values from Gonzaga Gomez et al. (2019). d Values from Havermann et al. (2022), considering a rapeseed biomass density of 1100 g m -2 and a leaf specific area of 39.6 m 2 kg -1. e Categories from MEGAN2.1 model (Guenther et al., 2012). f summed reactivity not accounting for "stress VOCs" and "other VOC leaf surface compounds".
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BibTeX
@article{buysse2026ecosystemscale,
title = {{Ecosystem-scale biogenic volatile organic compound fluxes over rapeseed by eddy-covariance}},
author = {Pauline Buysse and Florence Lafouge and Raluca Ciuraru and Brigitte Durand and Olivier Zurfluh and Céline Décuq and Olivier Fanucci and Lais Gonzaga Gomez and Jean-Christophe Gueudet and Sandy Bsaibes and Nora Zannoni and Valérie Gros and Benjamin Loubet},
journal = {Atmospheric Chemistry and Physics},
year = {2026},
month = aug,
doi = {10.5194/acp-26-12131-2026},
url = {https://hal.science/hal-05733489v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Ecosystem-scale biogenic volatile organic compound fluxes over rapeseed by eddy-covariance
AU - Pauline Buysse
AU - Florence Lafouge
AU - Raluca Ciuraru
AU - Brigitte Durand
AU - Olivier Zurfluh
AU - Céline Décuq
AU - Olivier Fanucci
AU - Lais Gonzaga Gomez
AU - Jean-Christophe Gueudet
AU - Sandy Bsaibes
AU - Nora Zannoni
AU - Valérie Gros
AU - Benjamin Loubet
PY - 2026
DA - 2026/08/26
JO - Atmospheric Chemistry and Physics
DO - 10.5194/acp-26-12131-2026
UR - https://hal.science/hal-05733489v1
AB - Biogenic volatile organic compounds (BVOCs) are key precursors of ozone and secondary organic aerosols, yet their emissions from croplands remain poorly characterized. Here, we report what is, to our knowledge, the first ecosystem-scale quantification of BVOC fluxes over a rapeseed crop during fruit development and senescence. Measurements were conducted at the FR-Gri ICOS site near Paris (France) in May-June 2017 using eddy covariance with a proton-transfer-reaction quadrupole ion guide time-of-flight mass spectrometer (PTR-Qi-TOF-MS). In total, 42 BVOCs were significantly emitted or deposited. Methanol dominated emissions during fruit development (about 90 % of total molar flux), followed by monoterpenes, acetone, and isoprene. During senescence, formaldehyde and methanethiol emerged as additional contributors and emission fluxes of oxygenated compounds like methanol, acetone, acetaldehyde, formaldehyde, formic acid and acetic acid were larger than during the fruit development period. Deposition fluxes over both periods were mainly attributed to formic acid (about 50 %), with smaller contributions from other oxygenated BVOCs. Several BVOCs, including formaldehyde and acetic acid, exhibited bidirectional fluxes. Besides, our findings show that the oxygenated BVOC SEFs, that were calculated in the present study with a slightly modified version of the MEGAN2.1 equations, were generally smaller than what is estimated in MEGAN2.1, while terpenoid BVOCs (isoprene, monoterpenes) SEFs may be underestimated in that model. Finally, our study points out that the contribution to total OH reactivity is mostly due to terpenoids (about 40 %), which suggests a larger role of croplands in secondary organic aerosol formation than currently represented in models. a SEF calculated with the equation proposed by Guenther et al. (2012), considering the adjustements detailed in Sect. 2.4.3. b Values from Guenther et al. (2012). c Values from Gonzaga Gomez et al. (2019). d Values from Havermann et al. (2022), considering a rapeseed biomass density of 1100 g m -2 and a leaf specific area of 39.6 m 2 kg -1. e Categories from MEGAN2.1 model (Guenther et al., 2012). f summed reactivity not accounting for "stress VOCs" and "other VOC leaf surface compounds".
SN - 1680-7316
SN - 1680-7324
ER -