Impact of dry deposition of semi-volatile organic compounds on secondary organic aerosols

Bertrand Bessagnet (1) , Christian Seigneur (2) , Laurent Menut (3, 4)

1 INERIS - Institut National de l'Environnement Industriel et des Risques
2 CEREA - Centre d'Enseignement et de Recherche en Environnement Atmosphérique
3 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
4 IPSL - Institut Pierre-Simon-Laplace

Dry deposition of semi-volatile organic compounds (SVOC) is not currently treated in most chemical transport models of air quality and this omission has been identified as a possible major source of uncertainty. The effect of dry deposition of SVOC on the concentration of secondary organic aerosols (SOA) is investigated in summertime with the chemical transport model CHIMERE that simulates SOA concentrations by means of molecular SOA surrogate species. Omitting dry deposition could overestimate SOA concentrations by as much as 50%. This overestimation is larger during nighttime due to higher relative humidity.

Mots clés: Dry deposition; Secondary organic aerosols; Modeling

Domaines: Sciences de l'environnement

Bertrand Bessagnet, Christian Seigneur, Laurent Menut. Impact of dry deposition of semi-volatile organic compounds on secondary organic aerosols. Atmospheric environment, 2010, 44, pp.1781-1787. ⟨10.1016/j.atmosenv.2010.01.027⟩. ⟨hal-00589313⟩