Objective To study the tropospheric abundance, reaction cycles, loss processes, and effect of Reactive Halogen Species in the troposphere, in particular with respect to their influence on the total oxidation capacity of the troposphere (marine and This study is a contribution to the part of the programme dealing with the Oxidation Capacity of the Troposphere. It will be achieved by coordinated field-, laboratory- and modelling investigations of reactive halogen species, their precursor and storage species, and the reaction mechanisms involved. Field measurements will include direct determination of halogen oxides by Differential Optical Absorption Spectroscopy (DOAS) at sub-ppt levels. The laboratory studies will close many gaps in our knowledge of RHS related homogeneous and surface-catalysed reactions including iodine chemistry. The latest data from field and laboratory studies will be assembled in trajectory- and limited area 3D models, which will help to understand the results of the field campaigns as well as to assess the regional and global impact of RHS chemistry. A further important part of this study will be the assessment of a possibly anthropogenic influence on RHS sources and the transformation mechanisms within the RHS reservoir. Thus possible mechanisms changing the tropospheric oxidation capacity due to human activities can be investigated. While a central question concerns the importance of release of RHS from sea salt aerosol, for instance due to reaction of anthropogenic NOy species (like N205, NO2) with sea salt aerosol, the detailed investigation of those processes is the aim of a parallel study with the sub-title "Sea Salt Aerosols: Laboratory Investigation of Heterogeneous Halogen Activation in the Troposphere (HALOTROP-SALT)". Areas where enhanced levels of RHS are to be expected (like polluted coastlines or polar regions) will be identified. Regional processes involving RHS will be set into a global perspective. Fields of science natural scienceschemical scienceselectrochemistryelectrolysisnatural sciencesphysical sciencesopticsspectroscopyabsorption spectroscopynatural scienceschemical sciencesinorganic chemistryhalogensnatural sciencesearth and related environmental sciencesatmospheric sciencesmeteorologytroposphere Programme(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Topic(s) 01020102 - Tropospheric physics and chemistry Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG EU contribution No data Address Im Neuenheimer Feld 229 69117 HEIDELBERG Germany See on map Total cost No data Participants (7) Sort alphabetically Sort by EU Contribution Expand all Collapse all BERGISCHE UNIVERSITAET GESAMTHOCHSCHULE WUPPERTAL Germany EU contribution No data Address Gauss-Straße 20 42097 WUPPERTAL See on map Total cost No data CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE France EU contribution No data Address Avenue de la Recherche Scientifique 1 C 45071 ORLEANS See on map Total cost No data NORWEGIAN INSTITUTE FOR AIR RESEARCH Norway EU contribution No data Address Instituttveien 18 2027 KJELLER See on map Total cost No data SWISS FEDERAL INSTITUTE OF TECHNOLOGY LAUSANNE Switzerland EU contribution No data Address ENAC-LPAS 1015 LAUSANNE See on map Total cost No data UNIVERSITY OF EAST ANGLIA United Kingdom EU contribution No data Address University Plain Norwich Research Park NR4 7TJ NORWICH See on map Total cost No data Universitetet i Bergen Norway EU contribution No data Address 70,Allégaten 5007 Bergen See on map Total cost No data University of Cambridge United Kingdom EU contribution No data Address Lensfield Road CB2 1EW Cambridge See on map Total cost No data
