Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 7 2009 10.5194/bg-6-1181-2009 http://www.biogeosciences.net/6/1181/2009/ http://www.biogeosciences.net/6/1181/2009/bg-6-1181-2009.html http://www.biogeosciences.net/6/1181/2009/bg-6-1181-2009.pdf 1181 1198 2009-07-17 CEFLES2: the remote sensing component to quantify photosynthetic efficiency from the leaf to the region by measuring sun-induced fluorescence in the oxygen absorption bands U. Rascher u.rascher@fz-juelich.de G. Agati L. Alonso G. Cecchi S. Champagne R. Colombo A. Damm F. Daumard E. de Miguel G. Fernandez B. Franch J. Franke C. Gerbig B. Gioli J. A. Gómez Y. Goulas L. Guanter Ó. Gutiérrez-de-la-Cámara K. Hamdi P. Hostert M. Jiménez M. Kosvancova D. Lognoli M. Meroni F. Miglietta A. Moersch J. Moreno I. Moya B. Neininger A. Okujeni A. Ounis L. Palombi V. Raimondi A. Schickling J. A. Sobrino M. Stellmes G. Toci P. Toscano T. Udelhoven S. van der Linden A. Zaldei Institute of Chemistry and Dynamics of the Geosphere, ICG-3: Phytosphere, Forschungszentrum Jülich, Leo-Brandt-Str., 52425 Jülich, Germany IFAC-CNR, Istituto di Fisica Applicata "Nello Carrara", Consiglio Nazionale delle Ricerche, via Madonna del Piano10, 50019, Sesto F. no, Firenze, Italy Department of Earth Physics and Thermodynamics, University of Valencia, Dr Moliner, 50, 46100 Burjassot, Valencia, Spain Laboratoire de Météorologie Dynamique, CNRS, Ecole Polytechnique, 91128 Palaiseau, France Remote Sensing of Environmental Dynamics Lab., DISAT, University of Milan-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy Geomatics Lab, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany Remote Sensing Laboratory. Instituto Nacional de Técnica Aeroespacial. Carr. de Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain Global Change Unit, Imaging Processing Laboratory, University of Valencia, Pol. "La Coma", s/n, 46980 Paterna, Valencia, Spain Center for Remote Sensing of Land Surfaces (ZFL), University of Bonn, Walter-Flex-Strasse 3, 53113 Bonn, Germany Max Planck Institute for Biogeochemistry, Hans Knoell Str. 10, 07745 Jena, Germany 11IBIMET-CNR, Instituto di Biometeorologia, Consiglia Nazionale delle Ricerche, Via G. Caproni 8, 50145 Firenze, Italy Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Department 1 – Geodesy and Remote Sensing, Telegrafenberg, 14473 Potsdam, Germany Laboratory of Plants Ecological Physiology, Division of Ecosystem Processes, Institute of Systems Biology and Ecology, Počíčí 3b, 60300 Brno, Czech Republic Metair AG, Flugpaltzm, 8915 Hausen am Albis, Switzerland Institute for Geophysics and Meteorology, University of Cologne, Kerpener Str. 13, 50937 Cologne, Germany Remote Sensing Department, University of Trier, 54286 Trier, Germany CRP-Gabriel Lippmann, Département "Environnement et Agro-biotechnologies", Geomatic Platform, 41, rue du Brill, 4422 Belvaux, Luxembourg The CEFLES2 campaign during the Carbo Europe Regional Experiment Strategy was designed to provide simultaneous airborne measurements of solar induced fluorescence and CO₂ fluxes. It was combined with extensive ground-based quantification of leaf- and canopy-level processes in support of ESA's Candidate Earth Explorer Mission of the "Fluorescence Explorer" (FLEX). The aim of this campaign was to test if fluorescence signal detected from an airborne platform can be used to improve estimates of plant mediated exchange on the mesoscale. Canopy fluorescence was quantified from four airborne platforms using a combination of novel sensors: (i) the prototype airborne sensor AirFLEX quantified fluorescence in the oxygen A and B bands, (ii) a hyperspectral spectrometer (ASD) measured reflectance along transects during 12 day courses, (iii) spatially high resolution georeferenced hyperspectral data cubes containing the whole optical spectrum and the thermal region were gathered with an AHS sensor, and (iv) the first employment of the high performance imaging spectrometer HYPER delivered spatially explicit and multi-temporal transects across the whole region. During three measurement periods in April, June and September 2007 structural, functional and radiometric characteristics of more than 20 different vegetation types in the Les Landes region, Southwest France, were extensively characterized on the ground. The campaign concept focussed especially on quantifying plant mediated exchange processes (photosynthetic electron transport, CO₂ uptake, evapotranspiration) and fluorescence emission. The comparison between passive sun-induced fluorescence and active laser-induced fluorescence was performed on a corn canopy in the daily cycle and under desiccation stress. Both techniques show good agreement in detecting stress induced fluorescence change at the 760 nm band. On the large scale, airborne and ground-level measurements of fluorescence were compared on several vegetation types supporting the scaling of this novel remote sensing signal. 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