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首页> 外文期刊>Journal of Physical Oceanography >Heton Shedding from Submarine-Canyon Plumes in an Arctic Boundary Current System: Sensitivity to the Undercurrent
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Heton Shedding from Submarine-Canyon Plumes in an Arctic Boundary Current System: Sensitivity to the Undercurrent

机译：北极边界流系统中海底峡谷羽流的希顿脱落：对暗流的敏感性

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摘要

The lateral injection of dense outflow into an Arctic baroclinic current though a submarine canyon is examined using a three-dimensional nonhydrostatic numerical model. The oceanographic setting in this model retains essential features of the active outflow region from the Chukchi shelf to the Beaufort Sea. The coastal ocean mainly consists of a continental shelf and slope region indented by a submarine canyon. The ocean surface is partially frictional to account for the ice-exerted friction. A boundary current is bounded to the left by the continental slope and, in the most interesting cases, is bounded below by a reverse undercurrent. Dense water is released from the upper canyon and produces a sinking plume that follows the canyon axis seaward. As it approaches the maximum sinking depth, the subsurface plume moves out of the canyon and turns to the right to become a right-bounded undercurrent over the continental slope. The right turn generates anticyclonic vorticity. The sinking motion also induces a surface cyclone trapped over the canyon. If the centers of the top cyclone and subsurface anticyclone are sufficiently separated horizontally, the pair can form a self-propagating heton moving seaward from the canyon. Thus the heton shedding is an efficient way to produce halocline anticyclones that are known to populate the Beaufort Sea. Shedding is most active for fast release of dense water and if the maximum sinking depth is in the lower halocline. Heton shedding can occur in the absence of a boundary current. A unidirectional boundary current enhances heton shedding. An undercurrent provides background negative vorticity to the subsurface anticyclone and moves the anticyclone in the direction favorable for the seaward heton propagation. In consequence, the addition of an undercurrent facilitates much more efficient heton shedding.
机译：使用三维非静水力数值模型研究了通过海底峡谷向北极斜流中密集注入的横向注入。该模型的海洋学背景保留了从楚科奇陆架到波弗特海的活跃流出区域的基本特征。沿海海洋主要由大陆架和海底峡谷缩进的斜坡区域组成。海洋表面是部分摩擦的，以解释冰的摩擦。边界流由大陆坡向左限制，在最有趣的情况下，边界流由反向潜流限制在下方。稠密的水从上峡谷释放出来，并沿着峡谷轴线向海方向下沉。当它接近最大下沉深度时，地下羽流从峡谷中移出并向右转，成为大陆坡上右边界的暗流。向右转会产生反气旋涡度。下沉运动还引起地面旋风被困在峡谷上。如果顶部旋风分离器和地下反旋风分离器的中心在水平方向上充分分开，则这对可以形成自蔓延的he，从峡谷向海移动。因此，休顿脱落是生产已知在波弗特海中栖息的卤代反旋风的有效方法。如果最大下沉深度在下部盐湖中，则脱落对于快速释放浓水最为活跃。在没有边界电流的情况下会发生休顿脱落。单向边界电流会增加氦气脱落。暗流为地下反旋风提供了背景负涡度，并使反旋风沿有利于向海面的海顿传播的方向移动。结果，增加暗流有助于更有效地排出水气。

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