Evaluation of an urban NMHC emission inventory by measurements and impact on CTM results |
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| Authors: | Isabelle Coll Cécile Rousseau Barbara Barletta Simone Meinardi Donald R Blake |
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| Institution: | 1. LISA (Laboratoire Interuniversitaire des Systèmes Atmosphériques), UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, CMC, 61 avenue du Général de Gaulle, 94 010 Créteil Cedex, France;2. LCP (Laboratoire Chimie Provence), UMR CNRS 6264, Pôle Environnement, Université de Provence, Campus St Charles, 3 place Victor Hugo, 13331 MARSEILLE Cedex 3, France;3. Department of Chemistry, University of California, Irvine, CA 92697-2025, USA;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;2. US Environmental Protection Agency, Research Triangle Park, NC, USA;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;2. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China;3. US Environmental Protection Agency, Research Triangle Park, NC, USA;4. Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing 100084, China;1. Atmospheric Chemistry Modeling Group, School of Earth and Environmental Science, Seoul National University, Seoul 151-747, Republic of Korea;2. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;1. State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Ave., Nanjing, Jiangsu 210023, China;2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Jiangsu 210044, China;3. Jiangsu Provincial Academy of Environmental Science, 176 North Jiangdong Rd., Nanjing, Jiangsu 210036, China |
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| Abstract: | This paper presents an evaluation of the consistency of an urban state-of-the-art hydrocarbon (HC) emission inventory. The evaluation was conducted through the comparison of this inventory with hourly HC measurements during two summer months in the centre of Marseille, on the Mediterranean French coast. Factors of under or overestimation could be calculated for each compound on the basis of a systematic HC to HC ratio analysis. These results, associated with a deep analysis of the speciation profiles, show that most of the common and highly concentrated hydrocarbons (such as butanes) are too much predominant in the emission speciation, while the heavy and less common species (branched alkanes, substituted aromatics) are under-represented in the inventory. The urban diffuse sources appear here as one critical point of the inventories. The disagreements were shown to have a strong incidence on the representation of the air mass reactivity. In a last step, the identified uncertainties in emissions were implemented in an air-quality model for sensitivity studies. It was shown that the observed biases in the inventory could affect the regional ozone production, with a probable impact on ozone peaks of 2–10 ppbv over the area. |
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