Obiettivo To obtain homogeneous measurements on the vertical distribution of stratospheric aerosols and ozone from the co-ordinated global lidar network. - to analyse the observed hemispheric differences and the interannual variability of aerosol and ozone content and their interdependencies in the corresponding latitudes in Northern and Southern hemisphere. - to study further the question of nondepolarising PSC particles (liquid) existing in significant amounts well below the NAT threshold temperature which was observed in the winter of 1995 at Sodankyl:. - to study specific PSC episodes by using trajectory model simulations and to perform model calculations of the impact of particles and PSCs on stratospheric ozone. - to enhance the lidar data analysis capabilities by studying the optical properties of the aerosol particles in the laboratory.A study of stratospheric aerosols and ozone in global scale is the core of the project. The main tool is a network of lidars with good latitudinal coverage combined with the modelling studies and laboratory experiments. The project is divided in seven tasks (see the attached diagram). Task 1 consists of setting up the lidar experiment at Sodankyld. Task 2, the field experiment, consists of a network of year-round lidar measurements of ozone and aerosols in the middle and high latitudes in the northern hemisphere (see the attached table). Auxiliary observations with sondes and spectrophotometers support the lidar measurements. Task 3, the data processing provides homogeneous, quality controlled data for the modelling studies. The modelling activity is divided in three tasks: Task 4, the trajectory modelling, consists of studying air mass transport, coupled with a chemical box model, Task 5, the global modelling, of running global 2-d and 3-d models, with extensive gas-phase chemistry and heterogeneous chemistry on aerosols, and Task 6, the scattering studies, of performing ray tracing simulations. Task 7 is a laboratory experiment where the formation and optical properties of particulate, both sulphate aerosols and PSC-particles, will be studied, providing support to the calibration of the lidars and data analysis in general. The basic quantity in lidar and the backscatter sonde measurements is the backscatter ratio. With depolarisation lidars also the depolarisation ratio will be obtained. Ozone DIAL instruments will provide the O3 number density profiles. With multi-wavelength lidars, or with a combination of a lidar and a backscatter sonde measurement, also the size distribution (median radius and concentration) will be retrieved and the shape and the phase of the particles are analysed with depolarisation data. The fundamental retrieved product is the total aerosol surface area as a function of altitude. From the networked year-round measurements also the latitudinal distribution and temporal evolution will be obtained. This is most important in assessing the chemical processing characteristics of the particles. As a result of model simulations the project will produce assessment of the role of SAONAS-observed aerosols on atmospheric chemistry, and ozone depleting processes in particular. Parameterisations of particle microphysics and PSC formation in global atmospheric models will be improved. Model climatologies of particles and ozone will be tested and improved. Hemispheric differences will be quantified through the modelling activity. From the laboratory studies scattering parameters of the particles will be retrieved and tabulated for lidar data analysis algorithms. Campo scientifico natural sciencesearth and related environmental sciencesatmospheric sciencesclimatologynatural sciencescomputer and information sciencesdata sciencedata processing Programma(i) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Argomento(i) 01020101 - Stratospheric chemistry and depletion of the ozone layer Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore FINNISH METEOROLOGICAL INSTITUTE Contributo UE Nessun dato Indirizzo Taehtelaentie 71 99600 Sodankylae Finlandia Mostra sulla mappa Costo totale Nessun dato Partecipanti (8) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Francia Contributo UE Nessun dato Indirizzo Route des Gètines 92371 VERRIERES-LE-BUISSON Mostra sulla mappa Costo totale Nessun dato ENEA - Ente per le Nuove Tecnologie, l'Energia e l'Ambiente Italia Contributo UE Nessun dato Indirizzo 4,Via Martiri di Monte Sole 40129 Bologna Mostra sulla mappa Costo totale Nessun dato FREIE UNIVERSITAET BERLIN Germania Contributo UE Nessun dato Indirizzo Arnimallee 14 14195 BERLIN Mostra sulla mappa Costo totale Nessun dato NATIONAL RESEARCH COUNCIL OF ITALY Italia Contributo UE Nessun dato Indirizzo Via Panciatichi 64 50127 FIRENZE Mostra sulla mappa Costo totale Nessun dato OBSERVATOIRE CANTONAL DE NEUCHATEL Svizzera Contributo UE Nessun dato Indirizzo 58,Rue de l'Observatoire 58 2000 NEUCHATEL Mostra sulla mappa Costo totale Nessun dato UNIVERSITE CLAUDE BERNARD LYON 1 Francia Contributo UE Nessun dato Indirizzo Boulevard du 11 Novembre 1918 69622 Villeurbanne Mostra sulla mappa Costo totale Nessun dato UNIVERSITY OF OSLO Norvegia Contributo UE Nessun dato Indirizzo Moltke Moes Vei 31 0315 OSLO Mostra sulla mappa Costo totale Nessun dato UNIVERSITÀ DEGLI STUDI - L'AQUILA Italia Contributo UE Nessun dato Indirizzo Via Vetoio 10, Coppito 67010 ASSERGI Mostra sulla mappa Costo totale Nessun dato
