51. The Mt Cimone, Italy, free tropospheric campaign: principal characteristics of the gaseous and aerosol composition from European pollution, Mediterranean influences and during African dust events
- Author
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Horst Fischer, D. Hauglustaine, Andreas Stohl, F. Raes, M. Schulz, R. Van Dingenen, P. Bonasoni, J. P. Putaud, Y. Balkanski, G. P. Gobbi, M. Hanke, S. E. Bauer, 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), European Commission - Joint Research Centre [Ispra] (JRC), Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche [Roma] (CNR), Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft, CNR, Consiglio Nazionale delle Ricerche (CNR), Max Planck Institute for Nuclear Physics (MPIK), Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), 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), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)
- Subjects
Mediterranean climate ,Pollution ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,Ozone ,010504 meteorology & atmospheric sciences ,media_common.quotation_subject ,010501 environmental sciences ,Atmospheric sciences ,01 natural sciences ,Trace gas ,Aerosol ,Troposphere ,chemistry.chemical_compound ,Mediterranean sea ,Atmosphere of Earth ,chemistry ,13. Climate action ,Climatology ,Environmental science ,0105 earth and related environmental sciences ,media_common - Abstract
International audience; A 5 weeks experiment (1 June to 5 July 2000) took place at a mountain site, Mt Cimone (44°11' N, 10°42' E, 2165 m a.s.l.), that is representative of Southern Europe background conditions. During this field campaign, a comprehensive characterisation of trace gases and radicals, involved in the production and destruction of O3, as well as of chemical, physical and optical properties of the aerosol was done. Atmospheric gases and aerosols were measured continuously over the 5 weeks period, in order to characterize their background concentrations in the free troposphere and their respective differences in air containing dust aerosols advected from Africa. Due to its location and elevation, Mt Cimone gets free tropospheric air both from the Mediterranean and from the Po Valley, which makes it an invaluable place to study gas/aerosol interactions. A global chemical model coupled to a GCM was used to simulate based upon ECMWF reanalysis the ozone over the region during the period of the field study. The heterogeneous reactions of O3, N2O5, HNO3 and NO3 were accounted for. We estimate that during the field campaign, the effect of heterogeous reactions was to reduce by 8 to 10% the ozone concentration at MTC in cases when air had passed over the Mediterranean Sea. When air was coming from the Atlantic or continental Europe, the reduction of ozone is still 4%. This reduction is mostly due to the large uptake of HNO3 and is the the topic of ongoing work to assess how it affects the global cycle of O3 and the global nitrogen budget.
- Published
- 2003