| Title: | Identification of the major HO(x) radical pathways in an indoor air environment |
| Author(s): | Mendez M; Amedro D; Blond N; Hauglustaine DA; Blondeau P; Afif C; Fittschen C; Schoemaecker C; |
| Address: | "Laboratoire Image Ville Environnement, LIVE UMR 7362 CNRS, Universite de Strasbourg, Strasbourg, France. Laboratoire des Sciences de l'Ingenieur pour l'Environnement, LaSIE UMR 7356 CNRS, Universite de La Rochelle, La Rochelle, France. PhysicoChimie des Processus de Combustion de l'Atmosphere, PC2A UMR 8522 CNRS, Universite Lille 1, Villeneuve d'Ascq, France. Laboratoire des Sciences du Climat et de l'Environnement, LSCE UMR 8212, Gif sur Yvette, France. Emissions, Measurements, and Modeling of the Atmosphere (EMMA) Laboratory, Unite Environnement, Genomique Fonctionnelle et Etudes Mathematiques, Centre d'Analyses et de Recherche, Faculty of Sciences, Saint Joseph University, Beirut, Lebanon. Laboratoire Interuniversitaire des Systemes Atmospheriques, LISA UMR 7583 CNRS, Universite Paris-Est Creteil (UPEC), Universite Paris Diderot (UPD), Creteil, France" |
| ISSN/ISBN: | 1600-0668 (Electronic) 0905-6947 (Linking) |
| Abstract: | "OH and HO(2) profiles measured in a real environment have been compared to the results of the INCA-Indoor model to improve our understanding of indoor chemistry. Significant levels of both radicals have been measured and their profiles display similar diurnal behavior, reaching peak concentrations during direct sunlight (up to 1.6x10(6) and 4.0x10(7) cm(-3) for OH and HO(2) , respectively). Concentrations of O(3) , NO(x) , volatile organic compounds (VOCs), HONO, and photolysis frequencies were constrained to the observed values. The HO(x) profiles are well simulated in terms of variation for both species (Pearson's coefficients: p(OH) =0.55, p(HO)(2) =0.76) and concentration for OH (mean normalized bias error: MNBE(OH) =-30%), HO(2) concentration being always underestimated (MNBE(HO)(2) =-62%). Production and loss pathways analysis confirmed HONO photolysis role as an OH precursor (here up to 50% of the production rate). HO(2) formation is linked to OH-initiated VOC oxidation. A sensitivity analysis was conducted by varying HONO, VOCs, and NO concentrations. OH, HO(2) , and formaldehyde concentrations increase with HONO concentrations; OH and formaldehyde concentrations are weakly dependent on NO, whereas HO(2) concentrations are strongly reduced with increasing NO. Increasing VOC concentrations decreases OH by consumption and enhances HO(2) and formaldehyde" |
| Keywords: | "Air Pollutants/*analysis/chemistry Air Pollution, Indoor/*analysis Environmental Monitoring Formaldehyde/analysis Hydroxyl Radical/*analysis/chemistry Oxidation-Reduction Volatile Organic Compounds/*analysis HOx chemistry HOx measurements field campaign i;" |
| Notes: | "MedlineMendez, M Amedro, D Blond, N Hauglustaine, D A Blondeau, P Afif, C Fittschen, C Schoemaecker, C eng Research Support, Non-U.S. Gov't England 2016/06/19 Indoor Air. 2017 Mar; 27(2):434-442. doi: 10.1111/ina.12316. Epub 2016 Jul 15" |
