Cel Changes of the composition of the Arctic stratosphere will be observed by a network of stations and determined by performing long-term measurements, assuring instrumental quality standards, analysing collected data sets, performing case studies, and stratospheric aerosol and chemical trajectory modelling. Collected data will be shared via European and international data banks. The objectives of this project are to: - continue the investigation of chemical and dynamical processes in the lower Arctic stratosphere within the European Stratospheric Monitoring Stations (ESMOS) network - perform modelling studies to investigate the processes controlling the ozone loss - determine the spatio-temporal extend of chemical perturbations in the lower and lowest part of the stratosphere, where air can be transported easily to mid latitudes - assess latitudinal trends in ozone and related trace species - establish an Arctic network of backscatter sonde and aerosol lidar stations to determine the extend of the occurrence of Polar Stratospheric Clouds and their formation processes - contribute to the observation of the solar UV radiation with high latitude stations.This proposal consists of activities, which will be carried out continuously during the whole project period and others, which are limited in time. The later ones are the intercomparison campaigns and the intensive measurement campaigns at the observation sites in the Arctic. These campaigns concentrate on the polar winter and spring, when ozone depletion is strongest and Polar Stratospheric Clouds occur. For the interpretation of the extensive set of species measured at the stations, chemical modelling will be performed to investigate the processes, which determine the chemical composition measured. Case studies for events which display special features like fast ozone reductions, or which are set up by the most complete measurements will be performed. They will also allow to determine the spatio-temporal extend of chemical perturbations which are caused by PSC-events. Such case studies will also be performed on the extensive data sets collected during the last years. By increasing the chlorine levels in the model corresponding to the expected increase following the CFC emissions, future ozone depletion might be predicted. Investigations of the vortex structure using our set of stations as well as those of other European funded activities, together with meteorological data made available within data banks at NILU, will be performed in order to assess the degree and mechanism to which in-vortex ozone depletion is linked to ozone depletion at middle latitudes. Quality control of the data will be performed in two steps. First, all measurements will be checked by the respective PIs and some instrumental techniques will be validated on site. This includes a FTIR intercomparison at Thule and a microwave radiometer intercomparison at Ny-Elesund. Secondly, the self-consistency of all data sets for each of the stations involved will be secured. Work here will include the cooperation with the other ESMOS/Alps and NDSC stations in order to develop standards applicable for all of them and all measured species. Consistency will be achieved by the intercomparison of measured data of one species obtained by different methods (including satellite data e.g. from GOME, which can act as a "travelling standard"), as well as by comparing (e.g. with the help of chemical models) the data of chemical species, which are related to each other. Radiation measurements in the UV-B range will be also performed and analysed at Thule, Sodankyld and Reykjavik. Dziedzina nauki natural sciencesearth and related environmental sciencesatmospheric sciencesengineering and technologymechanical engineeringvehicle engineeringaerospace engineeringsatellite technologynatural sciencesearth and related environmental sciencesenvironmental sciencesozone depletionnatural scienceschemical sciencesinorganic chemistryhalogens Program(-y) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Temat(-y) 01020101 - Stratospheric chemistry and depletion of the ozone layer Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator ALFRED WEGENER INSTITUTE FOR POLAR AND MARINE RESEARCH Wkład UE Brak danych Adres Telegraphenberg 43 A 14473 GROSS GLIENICKE POTSDAM Niemcy Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (7) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko DANISH METEOROLOGICAL INSTITUTE Dania Wkład UE Brak danych Adres 100,Lyngbyvej 100 2100 KOEPENHAGEN Zobacz na mapie Koszt całkowity Brak danych FINNISH METEOROLOGICAL INSTITUTE Finlandia Wkład UE Brak danych Adres Taehtelaentie 71 99600 Sodankylae Zobacz na mapie Koszt całkowity Brak danych INSTITUT FUER ATMOSPHAERENPHYSIK AN DER UNIVERSITAET ROSTOCK Niemcy Wkład UE Brak danych Adres Schloß-Strasse 4-6 18225 KOEHLUNGSBORN Zobacz na mapie Koszt całkowity Brak danych NORWEGIAN INSTITUTE FOR AIR RESEARCH Norwegia Wkład UE Brak danych Adres Instituttveien 18 2027 KJELLER Zobacz na mapie Koszt całkowity Brak danych National Physical Laboratory (NPL) Zjednoczone Królestwo Wkład UE Brak danych Adres Queen's Road TW11 0LW Teddington Zobacz na mapie Koszt całkowity Brak danych Università degli Studi di Roma La Sapienza Włochy Wkład UE Brak danych Adres Piazzale Aldo Moro 2/5 00185 Roma Zobacz na mapie Koszt całkowity Brak danych Universität Bremen Niemcy Wkład UE Brak danych Adres 28334 Bremen Zobacz na mapie Koszt całkowity Brak danych