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Intensified Diurnal Tides along the Oregon Coast

机译：俄勒冈州海岸日间涨潮

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Intensified diurnal tides are found along portions of the Oregon shelf (U.S. West Coast) based on analyses of high-frequency (HF) radar surface current data and outputs of a 1-km resolution ocean circulation model. The K_1 tidal currents with magnitudes near 0.07 m s~(-1) over a wider part of the shelf (Heceta Bank complex; 44°-44.5°N), previously predicted by Erofeeva et al., are confirmed here by newly available HF radar data. Intensified diurnal tides are also found along the narrow shelf south of Heceta Bank. In the close vicinity of Cape Blanco (42.8°N), diurnal tidal currents (K_1 and O_1 constituents combined) may reach 0.3ms~(-1). Appreciable differences in diurnal tide intensity are found depending on whether the model is forced with tides and winds (TW) or only tides. Also, diurnal variability in wind forcing is found to affect diurnal surface velocities. For the case forced by tides alone, results strongly depend on whether the model ocean is stratified [tides only, stratified (TOS)] or not [tides only, no stratification (TONS)]. In case TONS, coastal-trapped waves at diurnal frequencies do not occur over the narrow shelf south of 43.5°N, consistent with the dispersion analysis of a linear shallow-water model. However, in case TOS, diurnal tides are intensified in that area, associated with the presence of coastal-trapped waves. Case TW produces the strongest modeled diurnal tidal motions over the entire Oregon shelf, partially due to cross-shore tidal displacement (advection) of alongshore subinertial currents. At Cape Blanco, diurnal tidal variability dominates the modeled relative vorticity spectrum, suggesting that tides may influence the separation of the alongshore coastal jet at that location.
机译：根据对高频（HF）雷达表面当前数据的分析和1 km分辨率海洋环流模型输出的结果，发现俄勒冈州陆架（美国西海岸）部分地区日增潮。在此之前，Erofeeva等人预测，在较宽的架子（Heceta Bank复合体； 44°-44.5°N）上，K_1潮汐的大小在0.07 ms〜（-1）附近，在此得到证实。数据。在Heceta银行以南的狭窄架子上也发现了日增潮。在布兰科角（42.8°N）附近，昼夜潮流（K_1和O_1成分合计）可能达到0.3ms〜（-1）。根据模型是用潮汐和风（TW）还是仅用潮汐强迫，发现昼夜潮汐强度存在明显差异。同样，发现风力的昼夜变化会影响昼夜表面速度。对于仅靠潮汐强迫的情况，结果在很大程度上取决于模型海洋是否是分层的[仅潮汐，分层（TOS）]或否[仅潮汐，无分层（TONS）]。如果是TONS，则在43.5°N以南的狭窄大陆架上不会出现昼夜频率的沿岸陷波，这与线性浅水模型的色散分析一致。但是，如果使用TOS，则该地区的日潮会加剧，并伴有沿海海浪。案例TW在整个俄勒冈大陆架上产生了最强的模拟潮汐运动，部分原因是沿岸地下惯性流的跨岸潮汐位移（对流）。在布兰科角，昼夜潮汐变化主导着模型的相对涡度谱，表明潮汐可能会影响该位置的沿海近海喷射流的分离。

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    《Journal of Physical Oceanography》 |2014年第7期|1689-1703|共15页
  • 作者

    J.J.Osborne; A. L. Kurapov; G. D. Egbert; P. M. Kosro;

  • 作者单位

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

    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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