In this paper, we develop a method of estimating high temporal-spatial resolution LUE based on the
relationship between LUE obtained from Changbai site eddy covariance flux tower and MODIS-derived values of
scaled Photochemical Reflectance Index (sPRI). Using MODIS ocean band 11 at 531nm, we tried to detect
variations in canopy reflectance related to the xanthophyll cycle. After test MODIS bands 12 and 13 as the
reference band because the 570 nm reference band that had been determined to be optimum for calculating PRI in
earlier studies is not available on MODIS, strong correlation between MODIS-sPRI and LUE were found only for
backscatter reflectance scenes when band 13 (667nm) was used as the reference band with the relationship
coefficient is 0.86. Accoring to the method, the retrieved regional LUE can reflect the spatial distribution
variation.
Photosynthetically active radiation (PAR) is an essential parameter in vegetation growth model and soil carbon
sequestration models. A method is presented with which instantaneous PAR can be calculated with high accuracy from
Moderate Resolution Imaging Spectroradiometer (MODIS) atmosphere and land products. The method is based on a
simplification of the general radiative transfer equation, which considers five major processes of attenuation of solar
radiation: Rayleigh scattering, absorption by ozone and water vapor, aerosol scattering, multiply reflectance between
surface and atmosphere. Comparing 108 retrieveled results to filed measured PAR in Yucheng station of Chinese
Ecosystem Research Network (CERN) in 2006, and the r-square of 0.855 indicates that the computed results can
interpret actual PAR well.
A new simple model has been developed that incorporates Digital Elevation Model (DEM)
and Moderate Resolution Imaging Spectroradiometer (MODIS) products to produce incident
photosynthetically active radiation (PAR) for tilted surface. The method is based on a
simplification of the general radiative transfer equation, which considers five major processes
of attenuation of solar radiation: 1) Rayleigh scattering, 2) absorption by ozone and water
vapor, 3) aerosol scattering, 4) multiple reflectance between surface and atmosphere, and 5)
three terrain factors: slope and aspect, isotropic sky view factor, and additional radiation by
neighbor reflectance. A comparison of the model results with observational data from the
Yucheng and Changbai Mountain sites of the Chinese Ecosystem Research Network (CERN)
shows the correlation coefficient as 0.929 and 0.904, respectively. A comparison of the model
results with the 2006 filed measured PAR in the Yucheng and Changbai sites shows the
correlation coefficient as 0.929 and 0.904, respectively, and the average percent error as 10%
and 15%, respectively.
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