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Buoyancy-Driven Coastal Currents off Oregon during Fall and Winter

机译：秋季和冬季，俄勒冈州浮力驱动的沿海水流

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During fall/winter off the Oregon coast, oceanographic surveys are relatively scarce because of rough weather conditions. This challenge has been overcome by the use of autonomous underwater gliders deployed along the Newport hydrographic line (NH-Line) nearly continuously since 2006. The discharge from the coastal rivers between northern California and the NH-Line reach several thousands of cubic meters per second, and the peaks are comparable to the discharge from the Columbia River. This freshwater input creates cross-shelf density gradients that together with the wind forcing and the large-scale Davidson Current results in strong northward velocities over the shelf. A persistent coastal current during fall/winter, which the authors call the Oregon Coastal Current (OCC), has been revealed by the glider dataset. Based on a two-layer model, the dominant forcing mechanism of the OCC is buoyancy, followed by the Davidson Current and then the wind stress, accounting for 61% (±22.6%), 26% (±18.6%), and 13% (±11.7%) of the alongshore transports, respectively. The OCC average velocities vary from 0.1 to over 0.5 ms~(-1), and transports are on average 0.08 (±0.07) Sverdrups (Sv; 1 Sv = 10~6m~3s~(-1)), with the maximum observed value of 0.49 Sv, comparable to the summertime upwelling jet off the Oregon coast. The OCC is a surface-trapped coastal current, and its geometry is highly affected by the wind stress, consistent with Ekman dynamics. The wind stress has an overall small direct contribution to the alongshore transport; however, it plays a primary role in modifying the OCC structure. The OCC is a persistent, key component of the fall/winter shelf dynamics and influences the ocean biogeochemistry off the Oregon coast.
机译：在俄勒冈海岸外的秋冬期间，由于恶劣的天气条件，海洋学调查相对较少。自2006年以来，使用沿纽波特水文测绘线（NH-Line）连续部署的自主水下滑翔机已克服了这一挑战。加利福尼亚北部和NH-Line之间的沿海河流排放量达到每秒数千立方米，其峰值与哥伦比亚河的流量相当。这种淡水输入会产生跨架的密度梯度，再加上强迫风和大规模的戴维森洋流，会在架子上产生强劲的北向速度。滑翔机数据集揭示了秋冬期间持续存在的海流，作者称之为俄勒冈州海流（OCC）。基于两层模型，OCC的主要强迫机制是浮力，其次是Davidson Current，然后是风应力，分别占61％（±22.6％），26％（±18.6％）和13％ （±11.7％）的近岸运输量。 OCC的平均速度从0.1到超过0.5 ms〜（-1）不等，运输平均为0.08（±0.07）Sverdrups（Sv; 1 Sv = 10〜6m〜3s〜（-1）），观察到最大值值为0.49 Sv，与俄勒冈州沿海的夏季上升流相当。 OCC是一种表面捕获的沿海流，其几何形状受风应力的影响很大，与Ekman动力学一致。整体而言，风应力对沿岸运输的直接贡献很小。但是，它在修改OCC结构中起主要作用。 OCC是秋季/冬季陆架动力学的持续关键组成部分，并影响俄勒冈海岸附近的海洋生物地球化学。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第11期|2854-2876|共23页
  • 作者

    Piero L. F. Mazzini; John A. Barth; R. Kipp Shearman; A. Erofeev;

  • 作者单位

    College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, OR 97331-5503;

    College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon;

    College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon;

    College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon;

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