Abstract
The δ18Osw (seawater δ18O) and its relationship with salinity are principal information for analyzing mixing of water masses in the ocean, as well as reconstructing paleo-salinity from biogenic carbonate. Although δ18Osw–salinity equations have been reported in the Sea of Japan, it's unclear whether such equations are applicable in the Tsushima Current area. Here, we report 74 δ18Osw data in the Tsushima Current area. For shallow seawater samples (≤100 m),data were plotted along the mixing line that connects High Salinity Tsushima Current Water (HSTCW) and low-salinity/low-δ18Osw water. In the Tsushima Strait, the source of low-salinity/low-δ18Osw water was the Changjiang Diluted Water (CDW).Yet, in the Sea of Japan, the Tsushima Current surface waters exhibited more δ18O-depleted freshwater sources than the CDW (δ18Osw=-9.1+0.27×Salinity).Analysis of the freshwater budget with their δ18O values in the Tsushima Current surface water reveals that terrestrial water inputs from the Japanese Islands, precipitation, and evaporation were attributable to more δ18O-depleted freshwater sources. Further, we found that a mixing model for HSTCW, freshwater, and Northern Japan Sea Surface Water can be useful for analyzing provenance and mixing ratios of each surface water mass in the Sea of Japan.
Translated title of the contribution | Relationship between seawater oxygen isotope ratio and salinity in the Tsushima Current, the Sea of Japan |
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Original language | Japanese |
Pages (from-to) | 263-277 |
Number of pages | 15 |
Journal | 地球化学 |
Volume | 50 |
Issue number | 4 |
DOIs | |
State | Published - 2016 |
Externally published | Yes |