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Division rate of the volume transport between the Tsugaru Warm Current and the northward Tsushima Current

津轻暖流与北向对马洋流的体积输送分流率

基本信息

批准号：
02640313
负责人：
RIKIISHI Kunio
金额：
$ 0.64万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640313/
关键词：
Japan Sea Tsushima Current Tsugaru Warm Current Soya Warm Current Branching of the Ocean Current 対馬海峡津軽海峡宗谷海峡

项目摘要

Numerical study, research cruise and data analysis have been made in order to understand the physics of the circulation in the Japan Sea and the division rate of the transport of the Tsushima Current between the Tsugaru Warm Current and the northward Tsushima Current. It is found by the numerical study that the circulation in the Japan Sea has a clear seasonal cycle : the wind-driven circulation is dominant in winter whereas the circulation excited by the in- and outflow through the three straits is dominant in summer. It is suggested that the depth of the current relative to the bottom west of Aomori Prefecture might be responsible for the division rate of the transport.Observations of the transport of the Tsugaru Warm Current by ADCP show a very distinct diurnal variation, which is shown to be caused by the sea level difference or pressure gradient along the down stream direction. The mean transport of 1.3 Sv is found to be in good agreement with another value of 1.4 Sv estimated from the balance of geostrophic volume transports along the CTD sections west off Aomori Prefecture and southern Hokkaido.Transport estimations by Ohtani et al. (1989)are analyzed together with sea level observations to find that the transports of the Tsugaru Warm Current and the northward flow aie in proportion to the downward sea level differences. This leads to a conclusion that division rate of the transport between the two currents is determined by the ratio of the sea level difference along the Tsugaru Strait to that along the western coast of Aomori Prefecture and southern Hokkaido.

为了了解日本海环流的物理性质以及津加暖流和北向对马流之间对马流输送的分划率，本文进行了数值研究、研究巡航和数据分析。数值研究发现，日本海环流具有明显的季节循环特征，冬季以风驱动环流为主，夏季以三海峡进、流出激发环流为主。分析认为，青森县西部相对于底部的水流深度可能是造成交通分流率的主要原因。ADCP对津加暖流输送的观测显示出明显的日变化，这是由下游方向的海平面差或气压梯度引起的。根据青森县以西和北海道南部CTD段地转体积输运平衡估计的1.4 Sv值与1.3 Sv的平均输运值基本一致。将Ohtani et al.（1989）的输运估计与海平面观测结果结合起来分析，发现津加流暖流和北流的输运与海平面下降的差异成正比。由此可以得出两个海流之间输运的划分速率是由津加鲁海峡与青森县西海岸和北海道南部的海平面差之比决定的。