Inter-annual variability of carbon and water fluxes in Amazonian forest, Cerrado and pasture sites, as simulated by terrestrial biosphere models

摘要: This study analyzes the inter-annual variability (IAV) of simulations 21 different land surface model formulations, driven by meteorological conditions measured at 8 flux towers, located in rain forest, forest-savanna ecotone and pasture sites Amazonia, one savanna site Southeastern Brazil. Annual totals net ecosystem exchange (NEE) carbon evapotranspiration (ET), simulated each for site-year, were compared terms year-to-year possible relation to climate drivers. Results have shown that most models annual NEE ET, IAV these fluxes, are frequently from measurements. The average fluxes tend respond climatic drivers similarly observations, but with noticeable discrepancies. measurements negatively correlated rainfall forest group. Although ensemble all yields a similar result, only three formulations reproduce significant negative correlation rainfall. For tower controlled variations radiation this feature is captured models, both individual when grouped. However, ET values also significantly amount precipitation many ensemble, while there no observations. In general, able responses drivers, improvements still needed better capture their variability.