Axis, velocity and volume transport of the Kuroshio in the Tokara Strait

吐噶喇海峡黑潮的轴、速度和体积输送

基本信息

批准号：
02640319
负责人：
MAEDA Akio
金额：
$ 1.09万
依托单位：
Kagoshima 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 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640319/
关键词：
North pacific climate system Volume transport of the Kuroshio Tokara Strait Migration of the Kuroshio front Sea level records Satellite infrared image A typical temperature showing the axis of the Kuroshio Averaged position of the axis of th

项目摘要

It is necessary for understanding North Pacific climate system to monitor volume and heat transports of the Kuroshio. The Tokara Strait is a convenient sea area for monitoring of the transports. Many phenomena which have different time and space scales contribute fluctuation of the volume transport estimated from fluctuation of a sea level slope. For an example, migration of the Kuroshio front in the strait will contribute the fluctuation. So, we described relations between the front migration and the transport fluctuation, vertical structure of the front and generation of the front migration, using satellite infrared image, sea level records and time series of sea surface temperature. From the analyses, we got following results. 1. Northward migration of the front which extends from the sea surface to about 200m deep and originates from tongues of the shelf water west of the Yakushima is accompanied by increase of the volume transport between the Nakanoshima and the Satamisaki. 2. The inflow into the Kagoshima bay and the Ohsumi Branch Current strengthen after about 4 days of the northward migration.Although the front has been generally found between the Nakanoshima and the Yakushima, a major part of the volume transport of the Kuroshio is supposed to exist south of the Nakanoshima. This means that the axis of the Kuroshio will exist south of the island. So, we determined average position of the axis analyzing data of BT and GEK and measured subsurface velocity at a cite south of the Nakanoshima where the water depth is 750m. From the analysis and the measurement, we got following results. 3. A typical temperature showing the axis is 17.2ﾟC at 200m depth. The averaged position of the axis is near the Nakanoshima. The standard deviation of the position is *25km. 4. Velocity at 500 depth is higher than that at 300m deep and approximately parallel to isobaths.

有必要了解北太平洋气候系统以监测黑素的体积和热运输。 Tokara海峡是一个方便的海面，用于监测运输工具。许多具有不同时间和空间尺度的现象会导致海平面波动估计的体积传输的波动。例如，稻草中的黑发阵线的迁移将导致波动。因此，我们使用卫星红外图像，海平面记录和海面温度的时间序列描述了前迁移与运输波动，前部的垂直结构以及前部迁移的垂直结构之间的关系。从分析中，我们得到以下结果。 1。从海面延伸到约200m的北部迁移，起源于Yakushima以西的架子的舌头，伴随着Nakanoshima和Satomisaki之间的体积运输的增加。 2。在向北迁移的大约4天后，进入Kagoshima湾和Ohsumi分支的流入更强。尽管通常发现了Nakanoshima和Yakushima之间的前部，这是Nakanyshima南部的Kuroshio数量运输的主要部分。这意味着黑发的轴将存在于该岛以南。因此，我们确定了轴的平均位置分析了BT和GEK的数据，并测量了水深为750m的Nakanoshima以南的构想中的地下速度。从分析和测量中，我们得到以下结果。 3。显示轴的典型温度为200m深度的17.2 c。轴的平均位置在中岛附近。位置的标准偏差为 *25公里。 4。在500深度处的速度高于300m深，大约平行于等速线的速度。