Tracer experiments for appearance of the giant jellyfish, Nemopilema nomurai, in the southern Japanese coastal area of the Pacific Ocean in summer 2005

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Abstract

Numerically-tracking the tracer particles being assumed as the giant jellyfish, Nemopilema Nomurai, reveals is transport processes to the southern Japanese coastal area of the Pacific Ocean in summer 2005. The velocity fields, which are calculated by the high-accuracy numerical model developed for the Japan Coastal Ocean Predictability Experiment (JCOPE) system, are used in the tracer experiments. The experiments simulate transport paths of the jellyfish. It is clarified that the existence of a broad southward current toward the Pacific Ocean along the west coast of Kyushu caused the appearance of jellyfish in the southern Japanese coastal area of the Pacific Ocean. Then, near-shore Kuroshio path efficiently leaded the jellyfish to flow into the Seto Inland Sea. In addition, the jellyfish appeared there originated from the Changjiang estuary.

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