Hauptseite > Publikationsdatenbank > 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 > print

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041 _ _ |a eng
082 _ _ |a 570
084 _ _ |2 WoS
|a Ecology
084 _ _ |2 WoS
|a Geosciences, Multidisciplinary
100 1 _ |0 P:(DE-Juel1)129388
|a Rascher, U.
|b 0
|u FZJ
245 _ _ |a 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
260 _ _ |a Katlenburg-Lindau [u.a.]
|b Copernicus
|c 2009
300 _ _ |a 1181 - 1198
336 7 _ |a Journal Article
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440 _ 0 |0 14761
|a Biogeosciences
|x 1726-4170
|y 6
500 _ _ |a This work has been made possible by the funding support of the ESA-projects (1) Technical Assistance for Airborne/Ground Measurements in support of Sentinel-2 mission during CEFLES2 Campaign (ESRIN/Contract No. 20801/07/I-LG) (2) Technical Assistance for Airborne/Ground Measurements in support of FLEX mission proposal during CEFLES2 Campaign (ESRIN/Contract No. 20802/07/I-LG) (3) FLEX Performance analysis and requirements consolidation study (ESTEC/Contract No. 21264/07/NL/FF). Additional financial and intellectual support was provided by the SFB/TR 32 "Patterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling, and Data Assimilation" - project D2, funded by the Deutsche Forschungsgemeinschaft (DFG).
520 _ _ |a 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.
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