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

Vertical profiles for Δ 14 C values were described around the Bussol' Strait for the first time. The abnormality of Δ 14 C 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 Δ 14 C and σ ϑ suggested the intermediate water in the Sea of Okhotsk (26.8–27.3 σ ϑ ) has the role of the Okhotsk‐Pacific water exchange, and the deep water (>27.3 σ ϑ ) between the Sea of Okhotsk and the Pacific Ocean is mixed well rapidly through the Bussol' Strait. Using estimation of bomb produced 14 C inventories in each water column, it was suggested the quantities of the Okhotsk‐Pacific water exchange may be essentially small.