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A CO2 AND H2O CANOPY FLUXES MONITORING NETWORK ON WORLD BIOMES This is an informal announcement for scientists or Institutions currently (or soon) carring out studies on carbon and water vapor gaseous exchanges at canopy level in different terrestrial ecosystems. The direct measure of carbon dioxide and water vapor gaseous exchanges is now possible with the improvement of micrometeorological techniques (i. e.: eddy covariance) and long term integrated measurements of canopy gaseous exchanges are carried out on seasonal basis. Under the auspices of the IGBP BAHC (Biospheric Aspects of Hydrological Cycle) core project, an initiative has been undertaken to create an internation al scientific network to coordinate researches on different terrestrial ecosystems gasses exchanges experimental data in order to: *    provide a source of informations to parametrize the land surface proper ties (biological controls particularly) for the global circulation models (GCM) implementation; *    test more detailed ecophysiological models, leaves to canopies carbon assimilation integration schemes and water transport in the soil-plant- atmosphere system; *    monitor long term carbon flux studies for assessing the role of terrest rial ecosystem in the global carbon cycle and possibly detect the global changes effects on the major functions of natural ecosystems. In this preliminary phase, scientists willing to participate in the above- mentioned international network should kindly submit a short de_script_ion of the site, type of measurements, source of funding, duration of the experiments and possibly data availability to establish a common data-_base_ to: Dr. Riccardo Valentini TUSCIA UNIVERSITY DI.S.A.F.RI. Via De Lellis - 01100 Viterbo, Italy FAX   (39) (761) 357.389 This e-mail address is being protected from spam bots, you need JavaScript enabled to view it At the end of 1994, beginnig of 1995 an international workshop is under preparation to present the results of this international survey and discuss the problems of measurements, interactions with modeleres and coordination of research sites in various biomes of the world. Later on the BACH core project Office in Berlin, Germany, will officially conctact the partecipants with further details. Please circulate among collegues potentally interested. Viterbo,   April the 28th 1994 Riccardo Valentini For the Steering Committee of IGBP - BACH