Objetivo 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. Ámbito científico natural sciencesearth and related environmental sciencesatmospheric sciencesnatural scienceschemical scienceselectrochemistryelectrolysis Programa(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Tema(s) 01020101 - Stratospheric chemistry and depletion of the ozone layer Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG Aportación de la UE Sin datos Dirección Im Neuenheimer Feld 229 69117 HEIDELBERG Alemania Ver en el mapa Coste total Sin datos Participantes (4) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo Centre National de la Recherche Scientifique (CNRS) Francia Aportación de la UE Sin datos Dirección 4 place Jussieu 75252 Paris Ver en el mapa Coste total Sin datos FORSCHUNGSZENTRUM KARLSRUHE GMBH - TECHNIK UND UMWELT Alemania Aportación de la UE Sin datos Dirección 5,Hermann von Helmholtz Platz 1 76344 EGGENSTEIN-LEOPOLDSHAFEN Ver en el mapa Coste total Sin datos NORWEGIAN INSTITUTE FOR AIR RESEARCH Noruega Aportación de la UE Sin datos Dirección Instituttveien 18 2027 KJELLER Ver en el mapa Coste total Sin datos THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE Reino Unido Aportación de la UE Sin datos Dirección Trinity Lane, The Old Schools, CB2 1TN CAMBRIDGE Ver en el mapa Coste total Sin datos