Quantification of terrestrial ecosystem carbon dynamics in the conterminous United States combining a process-based biogeochemical model and MODIS and AmeriFlux data
作者： M. Chen , Q. Zhuang , D. R. Cook , R. Coulter , M. Pekour
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摘要: Abstract. Satellite remote sensing provides continuous temporal and spatial information of terrestrial ecosystems. Using these data eddy flux measurements biogeochemical models, such as the Terrestrial Ecosystem Model (TEM), should provide a more adequate quantification carbon dynamics Here we use Moderate Resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index (EVI), Land Surface Water (LSWI) AmeriFlux to conduct study. We first modify gross primary production (GPP) modeling in TEM by incorporating EVI LSWI account for effects changes canopy photosynthetic capacity, phenology water stress. Second, parameterize verify new version with data. then apply model conterminous United States over period 2000–2005 at 0.05° × resolution. find that made improvement previous generally captured expected patterns regional dynamics. estimate GPP is between 7.02 7.78 Pg C yr−1 net (NPP) ranges from 3.81 4.38 ecosystem (NEP) varies within 0.08–0.73 States. The uncertainty due parameterization 0.34, 0.65 0.18 estimates GPP, NPP NEP, respectively. extreme climate disturbances severe drought 2002 destructive Hurricane Katrina 2005 were model. Our study independent measure fluxes States, which will benefit studies carbon-climate feedback facilitate policy-making management climate.
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