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Role of Hydrological Parameters in the Uncertainty of Estimated Terrestrial Carbon Cycle in a Coupled Water-carbon Cycle Model
孙国栋
中国科学院大气物理研究所
Terrestrial carbon cycle acts as an important element to regulate atmospheric CO2 concentrations and climate changes in our Earth. Among the factors affecting the change of terrestrial carbon cycle, the hydrological cycle plays an important role. In this research, it is explored how an uncertainty degrees of the soil carbon and the net primary production (NPP) simulation or prediction is due to uncertainty of the hydrological physical process. The Lund-Potsdam-Jena Wetland Hydrology and Methane Dynamic Global Vegetation Model (LPJ-WHyMe DGVM), which could describe the interaction between the terrestrial carbon cycle and the hydrological cycle, is employed to discuss the issues. Four regions with different climate backgrounds are chosen to answer different behaviors about the impact of hydrological physical processes on the soil carbon and NPP. Numerical tests imply that the simulation ability and prediction skill of the soil carbon and the NPP could be raised by letting down all parameter errors among the hydrological processes. And, the benefits of reducing the parameters of relatively sensitive and important hydrological physical processes are almost close to the benefits of reducing the all parameters of hydrological physical processes.