%0 Journal Article %T Volatile and intermediate volatility organic compounds in suburban Paris: variability, origin and importance for SOA formation %+ Université Lille Nord (France) %+ Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) %+ École des Mines de Douai (Mines Douai EMD) %+ Cooperative Institute for Research in Environmental Sciences (CIRES) %+ ESRL Chemical Sciences Division [Boulder] (CSD) %+ Laboratoire de météorologie physique (LaMP) %+ Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) %+ Chimie Atmosphérique Expérimentale (CAE) %+ Max Planck Institute for Chemistry (MPIC) %+ JRC Institute for Environment and Sustainability (IES) %+ Laboratory of Atmospheric Chemistry [Paul Scherrer Institute] (LAC) %+ ICOS-RAMCES (ICOS-RAMCES) %+ Institut des Sciences Analytiques (ISA) %+ Web-Instrumented Man-Machine Interactions, Communities and Semantics (WIMMICS) %A Ait-Helal, Warda %A Borbon, Agnès %A Sauvage, Stéphane %A Gouw, Joost De, A. %A Colomb, Aurélie %A Gros, Valérie %A Freutel, Friederike %A Crippa, Monica %A Afif, Charbel %A Baltensperger, Urs %A Beekmann, Matthias %A Doussin, Jean-Francois %A Durand-Jolibois, Régine %A Fronval, Isabelle %A Grand, Noël %A Leonardis, Thierry %A Lopez, Morgan %A Michoud, Vincent %A Miet, Killian %A Perrier, Sébastien %A Prévôt, André, S. H. %A Schneider, Jodi %A Siour, Guillaume %A Zapf, Pascal %A Locoge, Nadine %< avec comité de lecture %@ 1680-7316 %J Atmospheric Chemistry and Physics %I European Geosciences Union %V 14 %P 10439– 10464 %8 2014 %D 2014 %R 10.5194/acp-14-10439-2014 %K organic compound %K SOA formation %K volatility %Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles %X Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 and January–February 2010, at the SIRTA observatory in suburban Paris. Measurements comprise primary and secondary volatile organic compounds (VOCs), of both anthropogenic and biogenic origins, including C 12 –C 16 n-alkanes of intermediate volatility (IVOCs), suspected to be efficient precursors of secondary organic aerosol (SOA). The time series of gaseous carbon are generally consistent with times series of particulate organic carbon at regional scale, and are clearly affected by meteorology and air mass origin. Concentration levels of anthropogenic VOCs in urban and suburban Paris were surprisingly low (2–963 ppt) compared to other megacities worldwide and to rural continental sites. Urban enhancement ratios of anthropogenic VOC pairs agree well between the urban and suburban Paris sites, showing the regional extent of anthropogenic sources of similar composition. Contrary to other primary anthropogenic VOCs (aromatics and alkanes), IVOCs showed lower concentrations in winter (< 5 ppt) compared to summer (13– 27 ppt), which cannot be explained by the gas-particle partitioning theory. Higher concentrations of most oxygenated VOCs in winter (18–5984 ppt) suggest their dominant primary anthropogenic origin. The respective role of primary anthropogenic gaseous compounds in regional SOA formation was investigated by estimating the SOA mass concentration expected from the anthropogenic VOCs and IVOCs (I / VOCs) measured at SIRTA. From an integrated approach based on emission ratios and SOA yields, 38 % of the SOA measured at SIRTA is explained by the measured concentrations of I / VOCs, with a 2 % contribution by C 12 –C 16 n-alkane IVOCs. From the results of an alternative time-resolved approach, the average IVOC contribution to SOA formation is estimated to be 7 %, which is half of the average contribution of the traditional aromatic compounds (15 %). Both approaches, which are based on in situ observations Published by Copernicus Publications on behalf of the European Geosciences Union. 10440 W. Ait-Helal et al.: Volatile and intermediate volatility organic compounds in suburban Paris of particular I / VOCs, emphasize the importance of the intermediate volatility compounds in the SOA formation, and support previous results from chamber experiments and mod-eling studies. They also support the need to make systematic the IVOCs' speciated measurement during field campaigns. %G English %2 https://uca.hal.science/hal-01119963/document %2 https://uca.hal.science/hal-01119963/file/acp-14-10439-2014.pdf %L hal-01119963 %U https://uca.hal.science/hal-01119963 %~ CEA %~ INSU %~ UNICE %~ UNIV-PARIS7 %~ INSTITUT-TELECOM %~ PRES_CLERMONT %~ CNRS %~ INRIA %~ UNIV-BPCLERMONT %~ UNIV-LYON1 %~ EM-DOUAI %~ INRIA-SOPHIA %~ I3S %~ INRIASO %~ INRIA_TEST %~ ISA %~ LAMP %~ GIP-BE %~ UPEC %~ TESTALAIN1 %~ LISA %~ WIMMICS %~ UVSQ %~ INRIA2 %~ ACL-SF %~ INC-CNRS %~ LSCE %~ UNIV-COTEDAZUR %~ UDL %~ UNIV-LYON %~ INSTITUTS-TELECOM %~ UNIV-PARIS %~ UP-SCIENCES %~ LSCE-CEA %~ GS-GEOSCIENCES %~ IMT-NORD-EUROPE %~ TEST2-HALCNRS %~ CERI-EE %~ INRIA-ETATSUNIS %~ INRIA-ALLEMAGNE