Distribution and variation of source water components in intermediate layer in the mixed water region revealed by multiple tracer analysis

为了揭示大潮和混合水域中间层的水团分布和环流情况，提出了一种估算该水域观测水的源水混合比的新方法，并将其应用于科考船和剖面浮标观测到的温度、盐度和溶解氧数据。利用观测到的海流等资料，对源水的体积输运进行了研究。结果表明，来自鄂霍次克海的水在中高层（26.7 ~ 27.0σ_θ）流入混合水区，体积输运相对较多，而来自西北太平洋亚北极环流的水则在中低层（27.0 ~ 27.3σ_θ）流入混合水区，体积输运相对较多。

In order to reveal the water mass distribution and circulation in the intermediate layer in the Oyashio and mixed water regions, a new method to estimate the mixing ratio among the source waters which form the observed water there was developed and applied to the temperature, salinity, and dissolved oxygen data observed there by our research vessel and profiling floats. Also, the volume transports of the source waters were examined using the observed ocean current data etc. As a result, it is quantitatively revealed that the water originated from the Okhotsk Sea flows into mixed water region with relatively more volume transport in the upper intermediate layer (26.7-27.0σ_θ) whereas the water originated from the subarctic gyre in the northwestern Pacific flows there in the lower layer (27.0-27.3σ_θ) with relatively more volume transport in contrast.