Development of coupled modeling system for regional water cycle and material transport in the atmospheric, terrestrial, and oceanic environment

Nagai, Haruyasu  ; Kobayashi, Takuya ; Tsuzuki, Katsunori ; Terada, Hiroaki  

A general-purpose model coupling program (JAEA-Coupler) has been developed to construct local to regional scale coupled models for environmental studies. In this coupled model, calculations of component models are carried out by different processors of parallel computers and the coupler controls these processes and handles data exchanges among component models using MPI. The coupler handles the data distribution to target models with interfacing spatial, temporal, and physical discrepancies among component models. By using JAEA-Coupler, an integrated coupled model system to simulate regional water cycle and material transport has been constructed. Test calculations were carried out to simulate water movement after heavy rainfall and dissolved material transport after a hypothetical release to the atmosphere. These results show the validity of the coupled model system in appropriate data exchanges among component models and reasonable reproduction of the target phenomena.