Objectif The scientific objectives of CHELOSBA to investigate are: - the seasonal and diurnal cycle of the NOy partitioning at various height in the mid-latitudes. In this respect, two major questions remain to answer: (a) How well is the NOy budget described by considering the species NO, NO2, NO3, N2O5, HNO2, HNO3, HO2NO2, ClONO2 and BrONO2? (b) Is the heterogeneous conversion of HO2NO2 into HNO2 at night and the subsequent photolysis of HNO2 in the early morning hours an important stratospheric OH-source? - the seasonal cycle of the Cly partitioning at various heights and latitudes in particular the annual cycle of the stratospheric HCl/ClONO2 ratio - the CH4 oxidation by measurement of the CH4/CH2O ratio. Derivation of the stratospheric OH concentration. - the potential impacts of iodine-containing species on the stratospheric ozoneThe work programme proposed comprises totally eleven balloon flights with two different kinds of payloads, intended to become flown at Leon/Spain, Gap/France and Kiruna/Sweden during spring, summer and late winter, respectively. Two different balloon payloads will be used for the measurements: 1. The LPMA gondola, which will accommodate the LPMA absorption FTIR together with the IUP UVvisible spectrometer. 2. The MIPAS gondola, which will accommodate the MIPAS emission FTIR. The photochemical information obtained will be interpreted with 3-D model calculation (SLIMCAT and TOMCAT) of the University of Cambridge. The meteorological support for the flight planning and the post flight data interpretation will be given by NILU and the Free University of Berlin meteorological groups. The data obtained within the project will be delivered to the ZARDOZ computer, and access will be given to any colleagues who have signed the data protocol. Champ scientifique natural sciencesearth and related environmental sciencesatmospheric sciencesnatural scienceschemical scienceselectrochemistryelectrolysis Programme(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Thème(s) 01020101 - Stratospheric chemistry and depletion of the ozone layer Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG Contribution de l’UE Aucune donnée Adresse Im Neuenheimer Feld 229 69117 HEIDELBERG Allemagne Voir sur la carte Coût total Aucune donnée Participants (4) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centre National de la Recherche Scientifique (CNRS) France Contribution de l’UE Aucune donnée Adresse 4 place Jussieu 75252 Paris Voir sur la carte Coût total Aucune donnée FORSCHUNGSZENTRUM KARLSRUHE GMBH - TECHNIK UND UMWELT Allemagne Contribution de l’UE Aucune donnée Adresse 5,Hermann von Helmholtz Platz 1 76344 EGGENSTEIN-LEOPOLDSHAFEN Voir sur la carte Coût total Aucune donnée NORWEGIAN INSTITUTE FOR AIR RESEARCH Norvège Contribution de l’UE Aucune donnée Adresse Instituttveien 18 2027 KJELLER Voir sur la carte Coût total Aucune donnée THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE Royaume-Uni Contribution de l’UE Aucune donnée Adresse Trinity Lane, The Old Schools, CB2 1TN CAMBRIDGE Voir sur la carte Coût total Aucune donnée
