Total OH reactivity measurements in Paris during the 2010 MEGAPOLI winter campaign
| Autor: | S. Sauvage, Nicolas Marchand, Valérie Gros, B. Bonsang, Roland Sarda-Esteve, Vinayak Sinha, C. Dolgorouky, Laurent Poulain, Jean Sciare, Jonathan Williams |
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| Přispěvatelé: | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Chimie Atmosphérique Expérimentale (CAE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Department of Earth and Environmental Sciences [Mohali], Indian Institute of Science Education and Research Mohali (IISER Mohali), Chemie der Atmosphäre [MPIC], Max-Planck-Institut für Chemie (MPIC), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Laboratoire Chimie de l'environnement (LCE), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), École des Mines de Douai (Mines Douai EMD), Institut Mines-Télécom [Paris] (IMT), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2012 |
| Předmět: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere Atmospheric Science 010504 meteorology & atmospheric sciences Chemistry Radical [SDE.MCG]Environmental Sciences/Global Changes 010501 environmental sciences 01 natural sciences 7. Clean energy lcsh:QC1-999 Trace gas Troposphere lcsh:Chemistry lcsh:QD1-999 13. Climate action Environmental chemistry Reactivity (chemistry) Loss rate NOx lcsh:Physics 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics Atmospheric Chemistry and Physics, European Geosciences Union, 2012, 12 (20), pp.9593-9612. ⟨10.5194/acp-12-9593-2012⟩ Atmospheric Chemistry and Physics, 2012, 12 (20), pp.9593-9612. ⟨10.5194/acp-12-9593-2012⟩ Atmospheric Chemistry and Physics, Vol 12, Iss 20, Pp 9593-9612 (2012) |
| ISSN: | 1680-7316 1680-7324 |
| DOI: | 10.5194/acpd-12-10937-2012 |
| Popis: | Hydroxyl radicals play a central role in the troposphere as they control the lifetime of many trace gases. Measurement of OH reactivity (OH loss rate) is important to better constrain the OH budget and also to evaluate the completeness of measured VOC budget. Total atmospheric OH reactivity was measured for the first time in an European Megacity: Paris and its surrounding areas with 12 million inhabitants, during the MEGAPOLI winter campaign 2010. The method deployed was the Comparative Reactivity Method (CRM). The measured dataset contains both measured and calculated OH reactivity from CO, NOx and VOCs measured via PTR-MS, GC-FID and GC-MS instruments. The reactivities observed in Paris covered a range from 10 s−1 to 130 s−1, indicating a large loading of chemical reactants. The present study showed that, when clean marine air masses influenced Paris, the purely local OH reactivity (20 s−1) is well explained by the measured species. Nevertheless, when there is a continental import of air masses, high levels of OH reactivity were obtained (120–130 s−1) and the missing OH reactivity measured in this case jumped to 75%. Using covariations of the missing OH reactivity to secondary inorganic species in fine aerosols, we suggest that the missing OH reactants were most likely highly oxidized compounds issued from photochemically processed air masses of anthropogenic origin. |
| Databáze: | OpenAIRE |
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