Objectif To investigate through laboratory studies the aqueous phase interconversions of oxidants (OH, HO2, O3, SO4-, NO3-, Cl2-) with key organic compounds which are transferred from the gas phase into the tropospheric aqueous phase. The processes to be studied are expected to influence the oxidising capacity of the troposphere by (1) phase transfer of organic compounds from the gas phase and (2) aqueous phase reactions of primary and secondary oxidants. The following organic key substance groups (KSG 1-5) have been chosen: (1) KSG 1: oxidation products of sulphur containing organics, (2) KSG 2: aldehydes and their condensation products with S(IV), (3) KSG 3: substituted aromatics, (4) KSG 4: isoprene and terpenes and (5) KSG 5: products from isoprene/terpene degradation. The tasks of this project are: 1. To quantify the reaction kinetics of strongly oxidising radicals such as OH, HO2, O3, NO3, SO4- and Cl2- with the key organic substances listed above with complementary techniques (pulse radiolysis/time resolved UV-absorption and laser flash photolysis / time resolved Vis aborption) to study the influence of TMI (FE, MN) in ozone reactions additionally. 2. To identify intermediates which are formed in aqueous phase free radical reactions by the complementary techniques of time resolved laser photolysis/long path diode array absorption spectroscopy and time-resolved electron spin resonance. 3. To determine accommodation and uptake coefficients of important gasphase organic species for each of the key substance groups. 4. To perform product studies in steady-state photolysis experiments in order to identify the most important stable degradation products for the most important constituents of each group as listed earlier. The project is expected to provide a number of rate data concerning phase transfer and reactivity. The use of these data as input-parameters in advanced tropospheric multiphase models is expected to significantly improve our understanding of the complex tropospheric chemistry system. Champ scientifique natural scienceschemical sciencesorganic chemistryaldehydesnatural sciencesphysical sciencesopticsspectroscopyabsorption spectroscopynatural sciencesearth and related environmental sciencesatmospheric sciencesmeteorologytropospherenatural scienceschemical sciencesnuclear chemistryradiation chemistrynatural sciencesphysical sciencesopticslaser physics Programme(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Thème(s) 01020102 - Tropospheric physics and chemistry Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur UNIVERSITY OF ESSEN Contribution de l’UE Aucune donnée Adresse Universitatsstrasse 5-7 45117 ESSEN Allemagne Voir sur la carte Coût total Aucune donnée Participants (5) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centre National de la Recherche Scientifique France Contribution de l’UE Aucune donnée Adresse 1 rue Blessig 67084 Strasbourg Voir sur la carte Coût total Aucune donnée Max-Planck-Gesellschaft zur Förderungder Wissenschaften e.V. Allemagne Contribution de l’UE Aucune donnée Adresse 15,Permoserstrasse 04303 Leipzig Voir sur la carte Coût total Aucune donnée RISOE NATIONAL LABORATORY Danemark Contribution de l’UE Aucune donnée Adresse Frederiksborgvej 399 4000 ROSKILDE Voir sur la carte Coût total Aucune donnée University of Leeds Royaume-Uni Contribution de l’UE Aucune donnée Adresse Hospital Lane LS2 9JT Leeds Voir sur la carte Coût total Aucune donnée Universität Leipzig Allemagne Contribution de l’UE Aucune donnée Adresse 9-11,Kanzler Augustplatz 9-11 04109 Leipzig Voir sur la carte Coût total Aucune donnée
