Assessment of HONO Measurements: The FIONA Campaign at EUPHORE
HONO is an important source of OH-radicals, the major oxidant in the atmosphere during daytime that participates in ozone formation and can lead to photo-smog. Nevertheless, there are still many open questions about its formation and role as a source of OH-radicals. A better knowledge of HONO processes is highly desirable for the improvement of air pollution models, many of which do not currently include heterogeneous HONO production mechanisms. One reason for the uncertainties in the atmospheric role of HONO is the difficulty in measuring this species.
To elucidate both aspects – chemical and instrumental issues – a HONO intercomparison campaign was carried out at the EUPHORE simulation chambers within the framework of the EUROCHAMP-2 project, in May 2010. EUPHORE provided a large and well-mixed gas volume for the simultaneous operation of multiple instruments under well controlled, realistic conditions. Ten experiments were carried out to simulate typical urban and semi-rural conditions and to address the following topics: (i) intercomparison of the different techniques, (ii) study of interferences (aerosols, nitrates, nitrites, NO2, etc.) and (iii) HONO sources (nitrophenols, vehicle emissions, ambient air, etc.). The first three experiments were part of an open-informal intercomparison while the rest of the intercomparison experiments were conducted under formally blind conditions with an external referee. The extensive participant list included the majority of groups working in this area globally, running simultaneously 18 techniques/instruments that covered nearly the whole range of techniques capable of measuring HONO. These included spectroscopic and chemical instruments.
In this work, an overview of the campaign in terms of participants, instruments aim of the experiments, etc. is presented, as well as the results of a selected open experiment.
KeywordsHONO FIONA Intercomparison Simulation chambers EUPHORE
The authors wish to acknowledge the European Community’s Seventh Framework Program under the grant agreement no. 228335 (Eurochamp2) through the TA E2-2009-12-29-0014 and E2-2010-02-15-0020.
The Instituto Universitario CEAM-UMH is partly supported by Generalitat Valenciana, and the projects GRACCIE (Consolider-Ingenio 2010) and FEEDBACKS (Prometeo – Generalitat Valenciana). EUPHORE instrumentation is partly funded by the Spanish Ministry of Science and Innovation, through INNPLANTA project: PCT-440000-2010-003
The FIONA Team
A. Muñoz1, M. Ródenas1, F. Alacreu1, H-P. Dorn2, T. Brauers2, J. Kleffmann3, P. Mikuška5, Z. Večeřa5, R. Häseler2, C. Ye2, A. Ruth6, S. Dixneuf6, D. Venables6, S. Darby6, J. Chen6, E. Ashu-Ayem6, Y. Elshorbany3, C. Voigt7, P. Jessberger7, S. Kaufmann7, D. Schäuble7, A. Mellouki8, M. Cazaunau8, B. Grosselin8, J.-F. Doussin9, A. Colomb9, V. Michoud9, K. Miet9, C. Afif9, S. Ball10, M. Daniels10, I. Goodall10, D. Tan11, R. Stickel11, A. Case12, B. Rappenglück13, G. Croxatto13, J. Dibb14, E. Scheuer14, X. Zhou15, M. Ferm16, R. Varma17, M. Pilling18, E. Clemente1, R. Porras1, T. Vera1, M. Vázquez1, E. Borrás1, J. Valero1, W. Bloss4.
1Instituto Universitario UMH – CEAM, Paterna, Valencia, Spain
2Forschungszentrum Jülich, Jülich, ICG-2, Germany
3Bergische Universität Wuppertal (BUW), Wuppertal, Germany
4University of Birmingham, Birmingham, UK
5Institute of Analytical Chemistry–Brno, Brno, Czech Republic
6University College Cork, Cork, Ireland
7German Aerospace Center – DLR, Bonn, Germany
8CNRS – ICARE, Orleans, France
9LISA, University Paris-12, Paris, France
10Univeristy of Leicester, Leicester, UK
11Georgia Technology, Atlanta, GA, USA
12University of Louisiana, Monroe, LA, USA
13University of Houston, Houston, TX, USA
14University of New Hampshire, Durham, NH, USA
15Wadsworth Center and SUNY Albany, NY, USA
16Swedish Environmental Research Institute, Göteborg, Sweden
17National Institute of Technology – NIT Calicut, Kerala, India
18University of Leeds, Leeds, UK
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