Kuroshio fractions in the southwestern sea of Japan; implications from radium isotopes
| Autor: | Y. Shirotani, Hisaki Kofuji, Hiroaki Kameyama, Masashi Ito, Toshiki Morokado, Masa-aki Yoshida, Mutsuo Inoue, Shotaro Hanaki, Seiya Nagao, Takafumi Shikata, Akira Okino |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Isotope Continental shelf 010604 marine biology & hydrobiology chemistry.chemical_element Geology Aquatic Science Seasonality Oceanography medicine.disease 01 natural sciences Current (stream) Salinity Radium chemistry Mixing ratio medicine Environmental science Kuroshio current 0105 earth and related environmental sciences |
| Zdroj: | Continental Shelf Research. 214:104328 |
| ISSN: | 0278-4343 |
| Popis: | To understand complicated current systems, we examined the 228Ra activities and 228Ra/226Ra activity ratios in 290 surface waters in the southwestern Sea of Japan from 2015 to 2020. The 228Ra/226Ra ratios exhibited large seasonal variation, showing higher ratios in July–September (1.5–2.5) than in other months. The fractions of the Kuroshio Current from the Pacific Ocean (fK), based on the 228Ra activities and salinity, in the western part of the study area were lowest in July after the steep decrease in the fK from May to July (0.95–0.6). This is due to the water mixing ratio of the East China Sea continental shelf side waters to the Kuroshio Current, reflecting the seasonal change and local water circulations. |
| Databáze: | OpenAIRE |
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