There remain large uncertainties in our model estimations of
terrestrial CO2 budget at broad scales. We used two terrestrial
carbon cycle models (Sim-CYCLE and SASAI) and three climate datasets
(NCEP/NCAR, NCEP/DOE, and ERA40) for the period from 1982 to 2001 and performed
cross-comparison, aiming at clarifying the source of uncertainties. Using the
same model, different carbon budgets were obtained by the three climate
datasets, globally due to the difference in solar radiation and locally due to
precipitation. The two models, which differ in canopy processes, estimated
different temporal trends and spatial patterns of CO2 budget during
the experimental period. This study exemplified the necessity of developments
in both models and datasets.
Author: Akihiko Ito and Takahiro Sasai (itoh at jamstec dot go dot jp)
Filesize: 68.69 Kb