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Provedor de dados:  Inra
País:  France
Título:  Elucidating physiology of plant mediated exchange processes using airborne hyperspectral reflectance measurements in synopsis with eddy covariance data
Autores:  Eiden, M.
van der Linden, S.
Schween, J.H.
Gerbig, C.
Neininger, B.
Brunet, Y.
Jarosz, N.
Traullé, O.
Geiss, H.
Rascher, U.
Data:  2007
Ano:  2007
Palavras-chave:   REMOTE SENSING
Resumo:  The Carbo Europe Regional Experiment Strategy (CERES), conducted between May and June 2005, aims to determine a spatiallyresolved regional balance of carbon dioxide fluxes using different methodological approaches bundled within an internationalframework. In this study we elucidated several meteorological and physiological parameters determining plant mediated exchangeprocesses using airborne hyperspectral reflectance measurements in synopsis with meteorological information like eddy fluxcovariance data. We used an airborne hyperspectral system to record spatial and temporal transects of vegetated areas surroundingflux tower sites in the Bordeaux / Landes Region (France). Alongside hyperspectral measurements a comprehensive range ofmeteorological and surface flux parameters were measured at a flux tower site within the same time frame.Unsupervised data analysis using cluster analysis was performed on predefined spectral wavelength windows. Additionallymultiblock principal component analysis was used as explanatory data driven tool to reveal underlying data structures and toelucidate potential interdependencies between airborne hyperspectral reflectance data and meteorological ground measurements.In detail temporal, physiological changes in relevant ground information like temperature, humidity, vegetation mediated CO2 flux,latent heat flux or photosynthetic light use efficiency on the one hand and selected regions of the hyperspectral signatures, such asreflectance in the region of 531nm, which determines variations in the photochemical reflectance index (PRI) or in the spectralregions of chlorophyll fluorescence were examined.Unsupervised cluster analysis revealed coupled dependencies between changes in the derivate spectra in the range of 720 to 740 nmwith gross photosynthetic uptake rate, global radiation and time of day. Multiblock principal component analysis revealed that firstderivative reflectance in wavelengths from 500 to 540 nm and between 680 and 750 nm had higher loading values in respect toobserved ground variables global radiation and gross photosynthetic uptake rate respectively. The significance of these findings isdiscussed.
Tipo:  Conference Proceedings
Idioma:  Inglês
Editor:  International Society for Photogrammetry and Remote Sensing (NLD)
Fonte:  10. International Symposium on Physical Measurements and Signatures in Remote Sensing ; 2007/03/12-14 ; Davos (CHE) International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XXXVI

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