Estimation of Photosynthetic Light Use Efficiency in Semi-Arid Ecosystems with the MODIS-Derived Photochemical Reflectance Index

Author

Goerner, A. ; Reichstein, M. ; Rambal, S.

Author_Institution

Model-Data-Integration Group, Max Planck Inst. for Biogeochemistry, Jena

Volume

3

fYear

2008

fDate

7-11 July 2008

Abstract

Direct estimations of light use efficiency from satellite data could reduce the uncertainties in data-oriented models of primary productivity. We analysed the potential of the photochemical reflectance index (PRI) based on MODIS data to approximate LUE of a Mediterranean Quercus ilex forest. Spectal band 1 (620-670 nm) turned out to be the best alternative reference band (the recommended 570 nm band does not exist on MODIS). Radiance correction with standard procedures (6S, dark object subtraction) did not improve the PRI-LUE relationship compared to the at-sensor reflectance version. The influence of surface anisotropy on the PRI signal was much reduced by constraining the observations to satellite data acquisitions with near nadir viewing angles.

Keywords

data acquisition; ecology; photosynthesis; reflectivity; vegetation; 6S; MODIS data; MODIS-derived photochemical reflectance index; Mediterranean Quercus ilex forest; PRI-LUE relationship; alternative reference band; dark object subtraction; data-oriented models; nadir viewing angles; photosynthetic light use efficiency estimation; radiance correction; reflectance version; satellite data acquisitions; semiarid ecosystems; Anisotropic magnetoresistance; Atmospheric modeling; Ecosystems; MODIS; Photochemistry; Productivity; Reflectivity; Satellites; Uncertainty; Vegetation; Photochemical reflectance index; drought; light use efficiency;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium, 2008. IGARSS 2008. IEEE International

Conference_Location

Boston, MA

Print_ISBN

978-1-4244-2807-6

Electronic_ISBN

978-1-4244-2808-3

Type

conf

DOI

10.1109/IGARSS.2008.4779458

Filename

4779458