Articles | Volume 6, issue 7
Biogeosciences, 6, 1181–1198, 2009

Special issue: Regional exchange of carbon between land and the atmosphere

Biogeosciences, 6, 1181–1198, 2009

  17 Jul 2009

17 Jul 2009

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. Rascher1, G. Agati2, L. Alonso3, G. Cecchi2, S. Champagne4, R. Colombo5, A. Damm6, F. Daumard4, E. de Miguel7, G. Fernandez3, B. Franch8, J. Franke9, C. Gerbig10, B. Gioli11, J. A. Gómez7, Y. Goulas4, L. Guanter12, Ó. Gutiérrez-de-la-Cámara7, K. Hamdi1, P. Hostert6, M. Jiménez7, M. Kosvancova13, D. Lognoli2, M. Meroni5, F. Miglietta11, A. Moersch1, J. Moreno3, I. Moya4, B. Neininger14, A. Okujeni6, A. Ounis4, L. Palombi2, V. Raimondi2, A. Schickling15, J. A. Sobrino8, M. Stellmes16, G. Toci2, P. Toscano11, T. Udelhoven17, S. van der Linden6, and A. Zaldei11 U. Rascher et al.
  • 1Institute of Chemistry and Dynamics of the Geosphere, ICG-3: Phytosphere, Forschungszentrum Jülich, Leo-Brandt-Str., 52425 Jülich, Germany
  • 2IFAC-CNR, Istituto di Fisica Applicata "Nello Carrara", Consiglio Nazionale delle Ricerche, via Madonna del Piano10, 50019, Sesto F. no, Firenze, Italy
  • 3Department of Earth Physics and Thermodynamics, University of Valencia, Dr Moliner, 50, 46100 Burjassot, Valencia, Spain
  • 4Laboratoire de Météorologie Dynamique, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
  • 5Remote Sensing of Environmental Dynamics Lab., DISAT, University of Milan-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
  • 6Geomatics Lab, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
  • 7Remote Sensing Laboratory. Instituto Nacional de Técnica Aeroespacial. Carr. de Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain
  • 8Global Change Unit, Imaging Processing Laboratory, University of Valencia, Pol. "La Coma", s/n, 46980 Paterna, Valencia, Spain
  • 9Center for Remote Sensing of Land Surfaces (ZFL), University of Bonn, Walter-Flex-Strasse 3, 53113 Bonn, Germany
  • 10Max Planck Institute for Biogeochemistry, Hans Knoell Str. 10, 07745 Jena, Germany
  • 1111IBIMET-CNR, Instituto di Biometeorologia, Consiglia Nazionale delle Ricerche, Via G. Caproni 8, 50145 Firenze, Italy
  • 12Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Department 1 – Geodesy and Remote Sensing, Telegrafenberg, 14473 Potsdam, Germany
  • 13Laboratory of Plants Ecological Physiology, Division of Ecosystem Processes, Institute of Systems Biology and Ecology, Počíčí 3b, 60300 Brno, Czech Republic
  • 14Metair AG, Flugpaltzm, 8915 Hausen am Albis, Switzerland
  • 15Institute for Geophysics and Meteorology, University of Cologne, Kerpener Str. 13, 50937 Cologne, Germany
  • 16Remote Sensing Department, University of Trier, 54286 Trier, Germany
  • 17CRP-Gabriel Lippmann, Département "Environnement et Agro-biotechnologies", Geomatic Platform, 41, rue du Brill, 4422 Belvaux, Luxembourg

Abstract. 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. The multi-scale design of the four airborne radiometric measurements along with extensive ground activities fosters a nested approach to quantify photosynthetic efficiency and gross primary productivity (GPP) from passive fluorescence.

Final-revised paper