Abstract
This study aimed to explore the transport patterns of reactive materials under the Tsushima Warm Current (TWC) in the Sea of Japan. Fine-resolution seasonal and lateral variations in 228Th/228Ra activity ratio were examined along with 228Ra/226Ra ratio in surface seawater samples from the Sea of Japan, East China Sea (ECS), and Pacific Ocean in 2015–2020. Significant 228Th/228Ra ratio variations were observed in surface seawaters (<∼0.02–0.3), which partially correlated with the mixing ratios of the low-228Th/228Ra continental shelf side waters from the western ECS and high-228Th/228Ra Kuroshio Warm Current of the Pacific Ocean, in addition to the contributions of the subarctic current of the northern Sea of Japan. Conversely, in the Sea of Japan, local variation of 228Th/228Ra ratios were observed in samples with a similar fraction of the ECS continental shelf side waters. It is reasonable to speculate that these variations are due to local scavenging during the TWC circulation.
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