Clarification of causes of environmental changes in the Ariake Bay based on results of analyses of sea-bottom mud cores and numerical simulations, and its regeneration

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The scenario for environmental changes from 1930s to the present in the Ariake Bay was shown using the results of chemical analyses of sea-bottom mud cores, in which the environmental changes in the past are recorded, and the existing documents about this bay in the present study. The validity of the scenario was discussed based on the results of numerical simulation for material cycles in each age of Ariake Sea using a low-order ecosystem model, and the mechanism of the deterioration of its marine environment was clarified. Moreover, the cause for the occurrence of hypoxic water whichbecame more serious in the Araike Bay was clarified, and its relaxation method was presented.