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| Titel |
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 |
| VerfasserIn |
U. Rascher, G. Agati, L. Alonso, G. Cecchi, S. Champagne, R. Colombo, A. Damm, F. Daumard, E. 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. Linden, A. Zaldei |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 7 ; Nr. 6, no. 7 (2009-07-17), S.1181-1198 |
| Datensatznummer |
250003908
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| Publikation (Nr.) |
 copernicus.org/bg-6-1181-2009.pdf |
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| Zusammenfassung |
| 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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