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Measurements of volume and heat transport of the surface Kuroshio

黑潮表面体积和热传输的测量

基本信息

批准号：
07454112
负责人：
IMAWAKI Shiro
金额：
$ 4.1万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454112/
关键词：
Kuroshio transport ADCP

项目摘要

Intensive surveys of the Kuroshio off Shikoku were carried out during 1993-1995 along a subsatellite track of the altimeter satallite TOPEX/POSEIDON.Hydrographic surveys and towed-ADCP (acoustic Doppler current profiler) surveys were carried out repeatedly along the line. Data from those observations as well as moored current measurements were analyzed synthetically. The following results were obtained ;(1) Two modes of the surface Kuroshio were detected by the repeated towed-ADCP surveys : one is the Kuroshio flowing very close to the coast and the other is that flowing far offshore.(2) Very strong flows (up to 100 cm/sec) and very strong vertical shears (stronger than 0.01 sec^<-1>) were observed around 300m depth by a moored-ADCP.(3) Generally, geostrophic shears estimated from the repeated hydrographic survey data compare well with vertical shears obtained from the direct current measurement data, but the abovementioned strong shears were not able to be estimated from the present hydrographic data.(4) Tide gauge data at a coastal station were compared with satellite altimetry data successfully and found to represent well the sea level fluctuations on the coastal side of the Kuroshio.(5) On the basis of combination of those in situ oceanographic data and satellite altimetry data, a three-year long time series of the Kuroshio transport was obtained with ten-day resolution. The results show that there are not apparent seasonal signals in the estimated fluctuations, which fact gives us a very important and interesting task in the future.

1993-1995年间，沿着卫星高度计TOPEX/POSEIDON的一条次卫星航迹对四国近海的黑潮进行了密集的调查。沿线反复进行了水文调查和拖曳-ADCP(声学多普勒海流剖面仪)调查。对这些观测数据以及系泊海流测量数据进行了综合分析。结果表明：(1)重复的拖曳-ADCP观测发现，表层黑潮有两种模式：一种是非常靠近海岸的黑潮，另一种是远离海岸的黑潮，(2)很强的水流(高达100厘米/秒)和很强的垂直切变(大于0.01秒)。(3)通过重复水文测量资料估算的地转切变与由直流测量资料得到的垂直切变基本一致，但上述强切变不能从现有的水文资料中估计出来。(4)将某海岸站的验潮资料与卫星测高资料进行了对比，发现它们很好地反映了黑潮沿岸的海平面波动。(5)在结合现场海洋资料和卫星测高资料的基础上，得到了长达3年的黑潮输送时间序列，分辨率为10天。结果表明，在估计的波动中没有明显的季节性信号，这一事实给了我们未来一个非常重要和有趣的任务。