The Okhotsk-Pacific seawater exchange in the viewpoint of vertical profiles of radiocarbon around the Bussol' Strait

Vertical profiles for Delta C-14 values were described around the Bussol' Strait for the first time. The abnormality of Delta C-14: values at 0-400 m depth in the Bussol' Strait was observed, and expected that diapycnal mixing occurs between the sub-surface water around the Bussol' Strait and the surface water in the Bussol' Strait. The Okhotsk-Pacific cross-sections through the Bussol' Strait of Delta C-14 and sigma (delta) suggested the intermediate water in the Sea of Okhotsk (26.8-27.3 sigma (delta)) has the role of the Okhotsk-Pacific water exchange, and the deep water (> 27.3 sigma (delta)) between the Sea of Okhotsk and the Pacific Ocean is mixed well rapidly through the Bussol' Strait. Using estimation of bomb produced C-14 inventories in each water column, it was suggested the quantities of the Okhotsk-Pacific water exchange may be essentially small.