Impacts of large-scale climatic disturbances on the terrestrial carbon cycle

摘要: The amount of carbon dioxide in the atmosphere steadily increases as a consequence anthropogenic emissions but with large interannual variability caused by terrestrial biosphere. These variations CO2 growth rate are large-scale climate anomalies relative contributions vegetation and soil decomposition is uncertain. We use biogeochemical model biosphere to differentiate effects temperature precipitation on net primary production (NPP) heterotrophic respiration (Rh) during two largest atmospheric increase last 25 years. One these, smallest year-to-year (largest land uptake) that period, was global cooling 1992/93 after Pinatubo volcanic eruption. other, record release), strong El Nino event 1997/98. find LPJ correctly simulates magnitude modulation for these extreme disturbances. response changes explains most modelled anomalous flux. Observed NEE good agreement, therefore we suggest temporal produced our reasonably realistic. conclude years disturbances cycle were strongly controlled processes rather then climatic events.