Investigation of the physicochemical features and mixing of East/Japan Sea Intermediate Water: An isopycnic analysis approach
Investigation of the physicochemical features and mixing of East/Japan Sea Intermediate Water: An isopycnic analysis approach
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东海/日本海中间水的物理化学特征和混合研究：等密度分析方法
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Tongsup Lee
中科院分区：
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作者：
Il;Dong‐Ha Min;D. H. Kim;Tongsup Lee
利用1999年夏季在东/日本海（EJS）观测到的高质量水文资料，研究了东/日本海中层水（ESIW）核心密度层（（cid：1）（cid：2）（cid：3）27.2-27.3）的混合比和性质的空间分布。ESIW被定义为具有最低盐度和最高溶解氧浓度的水源水类型。ESIW在提供溶解氧和将人为碳输送到EJS中/深层中起着重要作用。研究ESIW的形成和分布过程可能会提供对EJS的浅至中深温盐环流和最近的海洋变化的见解。在这里，我们结合联合收割机之前估计的混合比ESIW，最佳多参数（OMP）分析的基础上，其物理化学性质，如压力，溶解氧，磷酸盐，内插到几个等密度表面（（cid：1）（cid：2）（cid：3）27.20，27.25，和27.30）。ESIW的物理化学性质在40-41°N的副极地锋上表现出陡峭的南北梯度。在日本西部盆地，特别是滨海沿岸，发现了较高的ESIW溶解氧浓度（（cid：1）335（cid：4）kg mol（cid：5）1），这表明这是一个潜在的源区。ESIW等密度面上的表观氧利用率（AOU）的空间和深度分布表明，ESIW的俯冲发生在131-133°E（郁陵海盆），向南穿过副极地锋。郁陵海盆韩国海岸附近ESIW浅滩的密度层，暗示与海岸上升流的潜在联系。根据氧利用率和AOU估算了ESIW核心层的相对年龄。pCFC 12和相对年龄之间的相关性，以及在90%地表水氧饱和度条件下估计的AOU表明ESIW的十年尺度通气（（cid：2）24年）。在东日本海盆，ESIW的年轻沃茨与同一密度层的高盐度中层水共存。我们的分析表明，ESIW是敏感的气候强迫和一个重要的浅到中深的热盐环流组成部分的EJS。
We present spatial distributions of the mixing ratio and properties of the East/Japan Sea Intermediate Water (ESIW) at its core density layer ( (cid:1) (cid:2) (cid:3) 27.2–27.3) based on high-quality hydrographic data observed in the East/Japan Sea (EJS) during summer 1999. ESIW is defined as a source water type showing minimum salinity and maximum dissolved oxygen concentration. ESIW plays an important role in supplying dissolved oxygen and transporting anthropogenic carbon into the intermediate/deep layers in EJS. Studying the ESIW formation and distribution processes may provide insights on EJS’s shallow-to mid-depth thermohaline circulation and recent ocean changes. Here, we combine the previously estimated mixing ratio of ESIW, based on Optimum Multi-Parameter (OMP) analysis, and its physicochemical properties, such as pressure, dissolved oxygen, and phosphate, interpolated onto several isopycnic surfaces ( (cid:1) (cid:2) (cid:3) 27.20, 27.25, and 27.30). The physicochemical properties of ESIW show steep north-south gradients across the subpolar front at 40–41°N. Higher dissolved oxygen concentrations ( (cid:1) 335 (cid:4) mol kg (cid:5) 1 ) of ESIW are found in the western Japan Basin particularly off the Primorye coast, indicating a potential source region. The spatial and depth distributions of apparent oxygen utilization (AOU) on the ESIW isopycnic surfaces indicate that the subduction of ESIW occurs at 131–133°E (Ulleung Basin) across the subpolar front to the south. The density layer of ESIW shoals near the Korean coast in the Ulleung Basin, implying a potential link to coastal upwelling. The relative age of ESIW at its core layer is estimated from the oxygen utilization rate and AOU. The correlation between the pCFC12 and relative ages, and AOU estimated at 90% surface water oxygen saturation condition suggests a decadal-scale ventilation of ESIW ( (cid:2) 24 years). Younger waters at the ESIW coexist with the high-salinity intermediate water at the same density layer in the eastern Japan Basin. Our analysis suggests that ESIW is sensitive to climate forcing and an important shallow-to mid-depth thermohaline circulation component of EJS.