B43E-0606
Estimation of Carbon Fluxes from MODIS fAPARchl Product
Thursday, 17 December 2015
Poster Hall (Moscone South)
Tian Yao, NASA Goddard Space Flight Center, Greenbelt, MD, United States and Qingyuan Zhang, Universities Space Research Association Greenbelt, Greenbelt, MD, United States
Abstract:
In previous research studies, a common way to estimate the gross primary production (GPP) is to use the fraction of photosynthetically radiation (PAR) absorbed by vegetation (FPAR) and leaf area index (LAI). However, only the PAR absorbed by chlorophyll of the canopy, not the PAR absorbed by the foliage or by the entire canopy, is used for photosynthesis. MODIS fAPARchl product, which refers to the fraction of PAR absorbed by chlorophyll of the canopy, is derived from Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance by using a canopy-leaf radiative transfer model PROSAIL2. In this study, MODIS fAPARchl product has been used to estimate carbon fluxes in selected flux tower sites over different kinds of vegetation types including cropland, deciduous broadleaf forest, evergreen needle-leaf forest, mixed forest and grassland. The results show that MODIS fAPARchl product has the ability to better characterize phenology than current phenology model in the Community Land Model (CLM4.5) in Community Earth System Model (CESM 1.2), and it also will likely be able to increase accuracy of carbon fluxes simulations.
