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The South China Sea (SCS) exhibits strong variations of climate and physical processes ranging from mesoscale to ENSO dynamics,which influence carbon cycle and biological productivity in the region.We have developed and used a Pacific basin-wide physical-biogeochemical model to investigate physical variations,ecosystem responses,and biogeochemical consequences.The Pacific basin-wide circulation model,based on the Regional Ocean Model Systems (ROMS) with 50-km spatial resolution,is forced with daily air-sea fluxes derived from the NCEP reanalysis between 1990 and 2004.