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首页> 外文期刊>Journal of oceanography >Mesoscale-dependent near-inertial internal waves and microscale turbulence in the Tsushima Warm Current
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Mesoscale-dependent near-inertial internal waves and microscale turbulence in the Tsushima Warm Current

机译：Mesoscale依赖性内部波和微观湍流在Tsushima温暖的电流中

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This study examined characteristics of near-inertial internal waves (NIWs) associated with the background mesoscale field near the Tsushima Warm Current. Observational stations off Sado Island were visited recurrently to assess spatiotemporal changes of fine-scale and microscale properties of seawater. Also, NIWs were inspected in terms of relative vorticity and total strain in surface geostrophic motion. During summer expeditions in 2019, current and hydrographic surveys at the rim of an anticyclonic eddy provided clear evidence of downward-travelling NIWs, which were most amplified near the depth of lower pycnocline. The amplification of NIW coincided with elevation in the dissipation rates of turbulent kinetic energy (TKE) and microscale variation of temperature. The fall 2019 expedition found details of wave and turbulence properties associated with the mesoscale structure of paired vortices, where a cyclone and anticyclone were, respectively, adjacent to the east and west. Amplified signals of NIW-related vertical shear and TKE dissipation were found at isopycnals between the dipole cores. From the theoretical perspective of internal wave, the baroclinic term attributable to vertical shear of geostrophic current was interpreted as inducing downward travel of NIW through the lower pycnoclines between the dipole cores. It is also noted that cyclones, passing through the central part of Sea of Japan, can deliver kinetic energy into 10-km scale internal waves as a consequence of interaction between easterly wind and mountainous topography in the Honshu Island.
机译：该研究检查了与Tsushima温热电流附近的背景中尺度场相关的近惯性内波（NiW）的特征。令人互动的萨托岛的观测站常常访问，以评估海水的微尺度和微观性质的时空变化。此外，在表面热运动中的相对涡度和总菌株方面检查了NIWS。在2019年的夏季探险期间，反气旋涡流边缘的当前和水文调查提供了明确的行驶NiWS证据，这些证据是靠近脓脓肾上腺素深度的最大扩增。 NIW的扩增与湍流动能（TKE）和微观变型温度的耗散速率的升高。 2019年秋季探险发现与配对涡流的Mescle结构相关的波浪和湍流性能的细节，其中旋风分离器和旋转气旋分别与东西和西部相邻。在偶极核之间的异膜上发现了与NiW相关垂直剪切和TKE耗散的放大信号。从内部波的理论透视中，归属于根瘤热流的垂直剪切的羧基术语被解释为通过偶极芯之间的下部粘蛋白诱导NiW的向下行程。还有人指出，穿过日本海洋中部部分的旋风可以将动能传递成10公里的内部波，因为东风岛之间的山脉与山区地形之间的相互作用。

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