The role of topographically induced form drag on the channel flows through the East/Japan Sea
The role of topographically induced form drag on the channel flows through the East/Japan Sea
复制标题
地形引起的形状阻力对流经东海/日本海的航道的作用
DOI：
10.1029/2018jc013903
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Naoki Hirose and Shinichiro Kida
中科院分区：
文献类型：
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作者：
Sooyeon HAN;Naoki Hirose and Shinichiro Kida
用有限体积近岸海洋模式研究了东/日本海贯通流的动力机制。现有的海洋资料同化模式(Δx~10 Km)高估了通过津沽海峡的流量，并且津格鲁海峡和大豆/拉佩鲁斯海峡之间的外流分配也因模式而异。我们发现，这种高估发生在由津沽海峡详细的海底地形特征引起的形式阻力没有得到充分解决的情况下。在韩国/对马海峡、津格鲁海峡和索亚/拉佩鲁斯海峡进行了一系列不同水平分辨率的试验，以考察这三个海峡详细的海底地形特征如何影响通过流。我们发现，在铁杉海峡，流量输送对空间分辨率高度敏感，而在朝鲜/对马海峡和大豆/拉佩鲁斯海峡，流量输送对空间分辨率不敏感。这项高分辨率的实验表明，流经津沽海峡的流量减少了，模型偏差也减少了。通过Soya/La Perouse海峡的流出增加，而通过朝鲜/对马海峡的流入相对保持不变。用修正地形进行的其他试验进一步表明，津格鲁海峡上游一侧地形的突变在东/日本海贯穿流的外流分配中起着重要作用。
The dynamics responsible for the East/Japan Sea throughflow are examined using the Finite Volume Coastal Ocean Model. Existing ocean data assimilation models (Δx~10 km) present overestimates of the volume transport through the Tsugaru Strait, and the outflow partitioning between the Tsugaru and Soya/La Perouse Straits also differs depending on the models. We find that this overestimate occurs when the form drag that is induced by detailed bottom topographic features in the Tsugaru Strait is not adequately resolved. A range of experiments with different horizontal resolutions in the Korea/Tsushima, Tsugaru, and Soya/La Perouse Straits were conducted to examine how detailed bottom topographic features in these three straits may affect the throughflow. We find that the volume transport is highly sensitive to the spatial resolution at the Tsugaru Strait but not at the Korea/Tsushima and Soya/La Perouse Straits. The high‐resolution experiment showed a decreased outflow through the Tsugaru Strait and a reduction in the model bias. The outflow through the Soya/La Perouse Strait increased, while the inflow through the Korea/Tsushima Strait remained relatively unchanged. Additional experiments with modified topography further indicated that the abrupt change of the topography located at the upstream side of the Tsugaru Strait plays an important role in the outflow partitioning of the East/Japan Sea throughflow.