Observations of the structure of turbulent mixing across the Kuroshio
Observations of the structure of turbulent mixing across the Kuroshio
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DOI：
10.1029/2012gl052419
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发表时间：
2012-08-02
影响因子：
5.2
通讯作者：
Itoh, Sachihiko
中科院分区：
文献类型：
--
作者：
Kaneko, Hitoshi;Yasuda, Ichiro;Itoh, Sachihiko
通过在水流坐标系上合成微结构剖面，给出了春季黑潮湍流强度的平均结构。在气旋性和反气旋性两侧的锋面附近，拦门沙湍流能量耗散率的合成平均值较高。在气旋侧，在地转速度垂直切变较强的区域，观测到了> 10（-8）W kg（-1）（垂直扩散率>3 × 10（-5）m（2）s（-1））的横杠上的（NH3）。在50-150米（150-250米）深度范围内，沙洲上0至50公里（-25至50公里）处的深度平均值明显高于距离轴线>50公里处的深度平均值。虽然低于气旋侧，但在靠近锋面的反气旋侧50-150 m深度的沙洲上，（NH3）再次增强。在这一侧，水平速度的总垂直切变较强，而地转切变较弱。引文：Kaneko，H.，I. Yasuda，K. Komatsu和S. Itoh（2012），Observations of the structure of turbulent mixing across the Kuroshio，Geophys.保留信函：39，L15602，doi：10.1029/2012GL052419。
The mean structure of turbulence intensity across the Kuroshio in spring is presented by compositing microstructure profiles on a stream coordinate. The composite mean of turbulent energy dissipation rate (epsilon) over bar was high near fronts on both cyclonic and anticyclonic sides. On the cyclonic side, (epsilon) over bar > 10(-8) W kg(-1) (vertical diffusivity of >3 x 10(-5) m(2) s(-1)) was observed in the region of strong vertical shear of geostrophic velocity. Depth-averaged (epsilon) over bar within the depth range 50-150 m (150-250 m) was significantly higher at 0 to 50 km (-25 to 50 km) compared with >50 km from the axis. Although lower than on the cyclonic side, (epsilon) over bar at depths of 50-150 m on the anticyclonic side near the front was again enhanced. On this side, the total vertical shear of horizontal velocity was strong, whereas the geostrophic shear was weak. Citation: Kaneko, H., I. Yasuda, K. Komatsu, and S. Itoh (2012), Observations of the structure of turbulent mixing across the Kuroshio, Geophys. Res. Lett., 39, L15602, doi:10.1029/2012GL052419.