STUDY ON DEEP CIRCULATION IN JAPAN SEA BASED ON LAGRANGIAN CURRENT MEASUREMENT.

基于拉格朗日海流测量的日本海深部环流研究。

• 批准号: 06452084
• 负责人: TAIRA Keisuke
• 金额: $ 4.67万
• 依托单位: UNIVERSITY OF TOKYO,OCEAN RESEARCH INSTITUTE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452084/
• 关键词: Japan Sea Proper Water; Damping of radio active wastes; mid-depth circulation; Lagrangian measurement; ALACE Float; ARGOS System; Drifting speed.; Tidal current; アルゴスシステム; 日本海; 深層循環; ポップアップフロート; 自動浮上沈降; 潮流; 日本海の深層循環; 中立フロート; 人工衛星による追跡; 放射

The Japan Sea Proper Water with temperature of about 1ﾟC occupies below 100m layr in the Sea of Japan. The proper Water is formed off Siberian Coast by the winter cooling, but transport and migration of it was not clarified. The marine environment of Japan Sea is of great importance in these days partly by damping of radio active wastes or by oil spill caused by wreck of an oil tanker. Direct measurements of currents are requisite for circulation study. Moored current meters, of Eulerian measurement, are affected by topographic control, especially at deep layrs. On the other hand, tracking of neutral floats, of Lagrangian measurement, is most effective to show the transport of sea water. In August 1995, we deployed two ALACE (Autonomous Lagrangian Current Explorer) floats to drift at 300 m in the Sea of Japan. The float comes to the sea surface every 10 days ot twenty days, ant its position is fixed by a satellite tracking system, ARGOS.One float, deployed at 40ﾟ 43'N and 136ﾟ 18'E,showed an anti-clockwise eddy of 100 km in deiameter, and then moved about 300 km to northeast until December 1996. The other float, deployed at 40ﾟ 54'N and 132ﾟ 24'E,showed a clockwise eddy of about 300 km in diameter, and moved about 100 km to southwest. An average drifting speed at 300 m is of about 5 cm/sec. These trajectories indicate that the convected water off Siberia reaches to off the west coats of Hokkaido within one year and that the water does not come to off the San-in coast or south of Yamoto Rise. The positioning by the ARGOS System are made about ten times a day, and we estimated surface current to be about 100 cm/sec and a dominant tidal current is shown.

在日本海100 m以下的水层中，存在着温度约为1 ℃的日本海固有水。西伯利亚沿岸冬季冷却形成了适当的水，但它的运输和迁移还不清楚。日本海的海洋环境是非常重要的，在这些天，部分是由于衰减的放射性废物或由油轮沉船造成的溢油。直接测量海流是环流研究的必要条件。欧拉测量的系泊海流计受地形控制的影响，特别是在深水层。另一方面，拉格朗日测量的中性浮子的跟踪对于显示海水的输送是最有效的。1995年8月，我们在日本海部署了两个ALACE（自主拉格朗日海流探测器）浮标，在300米处漂流。该浮标每隔10 ~ 20天浮出海面一次，其位置由卫星跟踪系统ARGOS确定，其中一个浮标部署在北纬40 ° 43 ′，东经136 ° 18 ′，在1996年12月前显示出100公里的逆时针涡旋，然后向东北方向移动约300公里。另一个浮标部署在北纬40 ° 54 '和东经132 ° 24'，显示出直径约300公里的顺时针漩涡，并向西南方向移动约100公里。在300米处的平均漂移速度约为5厘米/秒。这些轨迹表明，西伯利亚沿岸对流水在一年内到达了北海道的西海岸，而没有到达山阴海岸或山本海隆以南。卫星环境数据收集系统每天大约进行10次定位，我们估计表面流约为100厘米/秒，并显示了一个主导潮流。

项目成果

Taira, Keisuke: "Observation of temperature and velocity in the coastal water off Kuala Terengganu, Malaysia." Journal of Oceanography.52. 251-257 (1996)

Taira, Keisuke：“马来西亚瓜拉丁加奴沿海水域温度和流速的观测。”

Takeuchi, T., K.Ogura, K.Taira, S.Kitagawa and Y.Nagai: "Fundamental study of a pop-up floats for ocean measurements by using an electro-chemical engine." Trans. IEE of Japan. 113B-6. 674-681 (1993)

Takeuchi, T.、K.Ogura、K.Taira、S.Kitakawa 和 Y.Nagai：“使用电化学引擎进行海洋测量的弹出式浮标的基础研究。”

平 啓介: "Direct measurements of mid-depth circuration in the Shikoku Basin by tracking SOFAR floats." J.Oceanogr.Soc.Japan. 46. 296-306 (1990)

Keisuke Taira：“通过跟踪 SOFAR 浮标直接测量四国盆地的中深度环流。”J.Oceanogr.Soc.Japan 46. 296-306 (1990)。

Taira, Keisuke: "On the activity of the University National Oceanographic Laboratories (UNOLS), U.S.A.(in Japanese)" Monthly Kaiyo. 29-2. 123-127 (1997)

平惠介：“关于美国大学国家海洋实验室 (UNOLS) 的活动（日语）”《海洋月刊》。

Taira, K., and D.Yanagimoto: "Deep circulation in the Shikoku Basin, measured with the SOFAR floats. Deep ocean circulation, physical aspects." Elsevier Science Pub.Series 59. 69-80 (1993)

Taira, K. 和 D.Yanagimoto：“四国盆地的深层环流，用 SOFAR 浮标测量。深海环流，物理方面。”