[AOS15-P14] Dynamics of Water mass in the East Japan Basin using Multiple Chemical Tracers
Keywords:Water mass analysis, Rare Earth Elements, East Japan Basin
The results of the four observation stations CR34 (140.00E, 45.67N), CR41 (138.93E, 44.20N), CR47 (138.21E, 42.82N), CR58 (135.92E, 40.43N), which located from northern to central region of East Japan Basin, were shown as follow. With comparing the DO and PO4-P vertical profiles of CR41 and CR47, PO4-P shows excess refer to the Redfield ratio, suggests the influence of particles. According to the REEs data, the CR41 and CR47 showed the same HREEs (Heavy REEs) patterns, indicates the advection from CR47 to CR41. Meanwhile, the same HREEs patterns also showed by CR41 500m and CR34 bottom water, suggests the advection from CR34 to CR41. Further, CR34 bottom water is influenced by resuspended particles or water masses out of East Japan Basin, which inferred by the higher LREEs (Light REEs) in CR34 bottom. In future, it is important to clarify the wide regional deep circulation with the biogeochemical observation in the northern part of Japan Sea and Okhotsk Sea.