Significant impact of urban tree biogenic emissions on air quality estimated by a bottom-up inventory and chemistry transport modeling - Laboratoire des Sciences du Climat et de l’Environnement Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2024

Significant impact of urban tree biogenic emissions on air quality estimated by a bottom-up inventory and chemistry transport modeling

Christopher Cantrell
Florian Couvidat
  • Fonction : Auteur
Barbara d'Anna
Claudia Di Biagio
Aline Gratien
  • Fonction : Auteur
Carmen Kalalian
  • Fonction : Auteur
Julien Kammer
Vincent Michoud
  • Fonction : Auteur
Jean-Eudes Petit
Marwa Shahin
  • Fonction : Auteur
Leila Simon
  • Fonction : Auteur
Myrto Valari
  • Fonction : Auteur
Jérémy Vigneron
  • Fonction : Auteur
Andrée Tuzet
  • Fonction : Auteur
Karine Sartelet

Résumé

Biogenic volatile organic compounds (BVOCs) are emitted by vegetation and react with other compounds to form ozone and secondary organic matter (OM). In regional air quality models, biogenic emissions are often calculated using a plant functional type approach, which depends on the land use category. However, over cities, the land use is urban, so trees and their emissions are not represented. Here, we develop a bottom-up inventory of urban tree biogenic emissions in which the location of trees and their characteristics are derived from the tree database of the Paris city combined with allometric equations. Biogenic emissions are then computed for each tree based on their leaf dry biomass, tree-species-dependent emission factors, and activity factors representing the effects of light and temperature. Emissions are integrated in WRF-CHIMERE air quality simulations performed over June–July 2022. Over Paris city, the urban tree emissions have a significant impact on OM, inducing an average increase in the OM of about 5 %, reaching 14 % locally during the heatwaves. Ozone concentrations increase by 1.0 % on average and by 2.4 % during heatwaves, with a local increase of up to 6 %. The concentration increase remains spatially localized over Paris, extending to the Paris suburbs in the case of ozone during heatwaves. The inclusion of urban tree emissions improves the estimation of OM concentrations compared to in situ measurements, but they are still underestimated as trees are still missing from the inventory. OM concentrations are sensitive to terpene emissions, highlighting the importance of favoring urban tree species with low-terpene emissions.
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Dates et versions

hal-04589996 , version 1 (28-05-2024)

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Alice Maison, Lya Lugon, Soo-Jin Park, Alexia Baudic, Christopher Cantrell, et al.. Significant impact of urban tree biogenic emissions on air quality estimated by a bottom-up inventory and chemistry transport modeling. Atmospheric Chemistry and Physics, 2024, 24 (10), pp.6011 - 6046. ⟨10.5194/acp-24-6011-2024⟩. ⟨hal-04589996⟩
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