Study on the Mechanism of Crawling up of the Kuroshio Deep Water in the Continental Slope Area

陆坡区黑潮深水爬升机理研究

• 批准号: 03640386
• 负责人: MATSUNO Takeshi
• 金额: $ 1.22万
• 依托单位: NAGASAKI 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: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640386/
• 关键词: Kuroshio deep water; Continental slope; Crawling up; Internal tide; Vertical eddy diffusivity; Energy dissipation rate; Bottom mixed layer; 大陸棚斜面; 鉛直混合; 微細構造; 東シナ海; 係留観測; 数値モデル

Vertical distribution of the energy dissipation rate measured near the slope region indicated that the dissipation rate could be large in the bottom mixed layer, and the vertical mixing should be vigorous just above the bottom. The vertical eddy diffusivity estimated just above the bottom was sometimes more than 10 cm^2s^<-1>.Vertical structure of internal tides near the continental slope was examined by current meters moored near the upper part of the continental slope. And it was suggested that the structure should varied in dependent with the variation of the location of Kuroshio's passage particularly at the layer just above the sloping bottom, while in the middle layer, near the thermocline it was recognized that the internal tides should be intensified during the spring tide. Such intermittent internal tides just above the bottom may occur when the density structure near the sloping bottom should be near critical.It was not recognized that the tip of the low temperature water mas … More s crawling up to continental shelf break oscillated back and forth accompanied with the tidal current. The second thermocline characterized by the upper and of the crawling up water oscillated vertically, and the thickness of the bottom mixed water varied by means of the internal tidal motions.From the current data obtained by current meters moored just above the bottom near the shelf break, it was shown that the averaged flows with a time scale longer than 25 hours had an up-slope component just above the bottom near the shelf break, though they had offshore component at the upper layers. This may be an evidence that the crawling-up low temperature water should be formed by the up-slope component of the current just above the sloping bottom.Two-dimensional numerical model was developed to examine the formation of the up-slope flow near the slope area. Numerical experiments indicated that up-slope secondary flow near the bottom around the shelf break should be formed when the time scale of vertical mixing is shorter than the inertial period. Less

斜坡附近的能量耗散率的垂直分布表明，在底部混合层的耗散率可以是大的，和垂直混合应该是强烈的底部以上。垂直涡动扩散率的估计值在海底上方有时超过10厘米^2秒^<-1>。大陆坡附近内潮的垂直结构由停泊在大陆坡上部附近的海流计进行检查。在斜底正上方，黑潮通过位置的变化会使结构发生变化，而在温跃层附近的中层，内潮在大潮时会增强。当斜底附近的密度结构接近临界时，这种间歇性的内潮就可能发生在底以上。 ...更多信息 S向陆架坡折处的爬行随潮流的往复摆动。第二温跃层的特征是上层和上层的爬高水垂直振荡，底层混合水的厚度受内潮运动的影响而变化。结果表明，时间尺度大于25小时的平均流量在靠近陆架坡折的底部上方有一个上坡分量，尽管它们在上层有离岸组件。这可能是一个证据，爬高低温水应该是由上游的电流的斜坡上的组成部分，在斜坡区附近的斜坡流的形成进行了研究。数值试验表明，当垂向混合时间尺度小于惯性周期时，在陆架坡折附近的近底处会形成上坡二次流。少

项目成果

松野 健: "鉛直拡散係数の計測とパラメタリゼーション" 沿岸海洋研究ノート. 31. (1993)

Ken Matsuno：“垂直扩散系数的测量和参数化”沿海海洋研究笔记31。（1993）

MATSUNO,T., H.KANEHARA, M.OKAZAKI: "Observation of Internal Tides near the Continental Shelf Break in the East China Sea." Umi to Sora. 69-1. (1993)

MATSUNO,T.、H.KANEHARA、M.OKAZAKI：“东海大陆架断裂附近的内潮汐观测”。