Interaction between submesoscale flows and microscale turbulent mixing, and their impacts on nutrients supply near the Kuroshio Front

亚尺度流与微尺度湍流混合之间的相互作用及其对黑潮锋附近营养物供应的影响

• 批准号: 20710002
• 负责人: NAGAI Takeyoshi
• 金额: $ 2.66万
• 依托单位: Tokyo University of Marine Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20710002/
• 关键词: サブメソスケール; フロント; 黒潮; 乱流混合; セカンダリーフ; 舌状分布; サブダクション; 湧昇; 低塩分水; Frontogenesis; サブダクシ; マイクロストラクチャー; 黒潮前線

A series of oceanographic field campaigns has been conducted to elucidate whether the Kuroshio Front is a site of enhanced microscale turbulent dissipation, and to investigate the impacts of submesoscale phenomena on watermass formations and nutrient supply. We found that the Kuroshio Front is the site of turbulent dissipation and mixing not only in the surface mixed layer front, but also in the thermocline under the Kuroshio main stream. The results from the numerical simulations of the Kuroshio with initial conditions taken from the observations suggest that the Kuroshio Front is also a major internal wave generator. The results of nutrient sample shows that the nutrient-rich Oyashio water can be penetrated into the nutrient-poor Kuroshio water, possibly fertilizing the Kuroshio by submesoscale subduction in the surface mixed layer front of the Kuroshio.

为了阐明黑潮锋是否是微尺度湍流耗散增强的场所，并研究亚中尺度现象对水团形成和营养物供应的影响，进行了一系列海洋学现场活动。我们发现，黑潮锋不仅是黑潮混合层锋的湍流耗散和混合场所，而且也是黑潮主流下温跃层的湍流耗散和混合场所。黑潮数值模拟的结果表明，黑潮锋也是一个主要的内波发生器。营养盐样品分析结果表明，富营养盐的亲潮水可以渗透到贫营养盐的黑潮水体中，可能通过黑潮表层混合层锋的次中尺度俯冲作用而淹没黑潮。

项目成果

Mesoscale eddy-induced reduction of biological production in eastern boundary upwelling systems

东部边界上升流系统中尺度涡流引起的生物产量减少

• 期刊: submitted to Nature Geoscience
• 作者: Gruber;Lachkar;Frenzel;Marchesiello;Munnich;McWilliams;Nagai;Plattner
• 通讯作者: Plattner

ホームページ等。

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Observations of Microscale Turbulent Dissipation and Submesoscale Physical and Biological Structures in the Kuroshio Front

黑潮锋微尺度湍流耗散和亚介尺度物理和生物结构的观测

• 发表时间: 2010
• 作者: 長井;Tandon;Yamazaki;Doubell;Kokubu;Gallager;York;Clayton;Holmes
• 通讯作者: Holmes

Submesoscale subduction and enhancement of chlorophyll pigments in the Kuroshio Front

黑潮前缘的亚中尺度俯冲和叶绿素色素的增强

• 作者: Nagai;Yamazaki;Katagiri;Takano
• 通讯作者: Takano

Simulation and observation of submesoscale subduction and upwelling near ocean fronts

近洋锋亚中尺度俯冲和上升流的模拟与观测

• 发表时间: 2008
• 作者: Nagai;Tandon;Yamazaki
• 通讯作者: Yamazaki