Abstract
A simple CO2 partial pressure (pCO2) ecological model was developed in the seagrass meadow of Hashirimizu Coast in Tokyo Bay. It was revealed from the field observations that pCO2 in sea water was lower than the atmosphere, which shows that CO2 was absorbed from the atmosphere to the coastal water. Since pCO2 in seawater was found to temporally fluctuate greatly, it was expected that ecological processes and hydrological dynamics, such as photosynthesis and advection-diffusion processes, may play a great role in the change in pCO2. We thus made an attempt to apply a three-dimensional numerial model, Fantom, to model dissolved inorganic carbon and pCO2. The model resutls were in good agreement with the field observations. The numerical computations showed that the most influential component is a photosynthesis process, which is followed by an advection-diffusion process and lastly a respiration process.
