Objetivo Experimental and theoretical approaches will be integrated to better understand the complicated processes that influence air-sea gas transfer and to develop algorithms for practical use. To derive better parametrisation of the air-sea transfer velocities of gases in terms of environmental parameters that are routinely available. To improve knowledge of the effect of shear on breaking waves, and how breaking waves and shear combine in air-sea transfer. To develop practical methods of measuring bubble fluxes and distributions which can be applied both on the open ocean and in the laboratory. To improve the parametrisation of the relationship of bulk sea surface temperature and radiometric brightness temperature.Measurements will be made in September 1996 and in February/March 1997 in the Large Air Sea Interaction Simulation Tunnel of the Institut de Recherche sur les Phenomenes Hors Equilibre, Laboratoire Interactions Ocean-Atmosphere Luminy (IRPHE-IOA), in Marseille, France.The tunnel will be sealed and tests will be made to determine the exchange of air between the tunnel and its surroundings. Air introduced in the tunnel will be purified.Whitecaps will be simulated with bubbles generated by an aeration device (a submerged grid of porous ceramic tubes)and by waves generated by wind and/or a wave maker. Bubble spectra and fluxes will be quantified optically and acoustically. Surface phenomena and micro-layer structure will be studied with thermal imagers and radiometers.Breaking wave phenomena and turbulence in water and air will be quantified. Gases will be introduced into the tunnel, either in the water or in the artificially generated bubbles, and gas concentrations will be measured in the water and in the air to determine the exchange rates in a variety of conditions.Individual processes will be simulated in an idealised situation to determine the effects on the transfer coefficients of parameters like wave height, bubble fluxes, wind velocity and air and water temperature. The influence of individual parameters, or combinations of parameters, on the exchange coefficients can be deduced by varying each of these in turn.The gases used in these experiments are carbon dioxid (CO2), nitrous oxide (N2O), methane (CH4), dimethyl sulphide (DMS), methyl bromide (CH3Br), bromoform (CHBr3), 3He and SF6.Theoretical and numerical modelling studies of gas transfer mechanisms are an essential part of the study. They are central to developing the chief, final product - an improved parametrisation of air- sea gas transfer velocities and an algorithm for use in, e.g. climate models.The models will be extended as required for the full exploitation of the experimental results, and they are required to determine the effect of differences between laboratory and field conditions. Ámbito científico natural scienceschemical sciencesorganic chemistryaliphatic compounds Programa(s) FP4-ENV 2C - Specific programme of research and technological development in the field of environment and climate, 1994-1998 Tema(s) 010101 - Basic processes of the climate system Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador NETHERLANDS ORGANISATION FOR APPLIED SCIENTIFIC RESEARCH - TNO Aportación de la UE Sin datos Dirección 63,Oude Waalsdorperweg 63 2509 JG DEN HAAG ('S-GRAVENHAGE) Países Bajos Ver en el mapa Coste total Sin datos Participantes (6) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Francia Aportación de la UE Sin datos Dirección 3,rue Frédéric Joliot-Curie 49 13384 MARSEILLE Ver en el mapa Coste total Sin datos MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V. Alemania Aportación de la UE Sin datos Dirección Johann Joachim-Becher-Weg 27 55020 MAINZ Ver en el mapa Coste total Sin datos NERC Centre of Coastal and Marine Sciences Reino Unido Aportación de la UE Sin datos Dirección Prospect Place West Hoe PL1 3DH Plymouth Ver en el mapa Coste total Sin datos Risø National Laboratory Dinamarca Aportación de la UE Sin datos Dirección 399,Frederiksborgvej 399 4000 Roskilde Ver en el mapa Coste total Sin datos University College Galway Irlanda Aportación de la UE Sin datos Dirección 90 Galway Ver en el mapa Coste total Sin datos University of Southampton Reino Unido Aportación de la UE Sin datos Dirección European Way SO14 3ZH Southampton Ver en el mapa Coste total Sin datos
