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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Observations of Air-Sea Momentum Flux Variability Across the Inner Shelf
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Observations of Air-Sea Momentum Flux Variability Across the Inner Shelf

机译：在内架上的空中海运动量助焊性的观察

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Over the open ocean, the aerodynamic drag coefficient is typically well predicted; however, the impact depth-limited processes have on the drag remains underexplored. A case study is presented here where winds, waves, and currents were simultaneously observed from a mobile platform that repeatedly transected the inner shelf of Monterey Bay, CA. Eddy covariance-derived drag coefficients were compared to several bulk parameterizations, including all of the roughness variations of COARE 3.5 and two explicitly depth-limited models. The analysis demonstrated that the drag was underestimated by O(2-4) times and the variability with wind speed or cross-shore distance was not well predicted. The drag based on a recent depth-limited roughness length model performed substantially better than the rest of the bulk estimates, which were all within 15% of each other and effectively equivalent given typical operational uncertainties. The measured friction velocity was compared to a wave-dependent parameterization and generalizing the model to arbitrary water depth significantly improved the mean observation-model difference to within 30%. Latent variability in the observation-model comparison was associated with stability, wind direction, and wave steepness. The wind stress angle variability was also analyzed. Stress veering was correlated with the alongshore surface current within 2km from shore (r(2)=0.7-0.95, p < 0.05); offshore of this margin, consistent wind stress veering was observed and may be attributable to a secondary, low-frequency swell system. These results demonstrate that it remains a persistent challenge to accurately predict wind stress variability in the nearshore, especially at locations with complex wave and current fields.
机译：在开阔的海洋上，空气动力学阻力系数通常预测;但是，拖动的冲击深度有限的过程仍然是缺陷的。这里提出了一种案例研究，其中从一个反射蒙特利湾内架的移动平台同时观察到风，波和电流，在移动平台上观察到蒙特雷湾的内架。将涡旋协方差导出的阻力系数与多个批量参数化进行比较，包括CoARA 3.5和两个明确深度限制模型的所有粗糙度变化。该分析表明，o（2-4）次低估了阻力，并且不受风速或交叉距离的可变性。基于最近的深度限制粗糙度长度模型的拖动基本上比批量估计的其余估计更好，其彼此的15％内并有效地等同于给定典型的操作不确定性。将测量的摩擦速度与波依赖性参数化进行比较，并将模型概括为任意水深显着改善平均观察模型差异在30％以内。观察模型比较中的潜在变异与稳定性，风向和波陡有关。还分析了风应力角度变异性。应力转向与距离岸上的2km内的沿海表面电流相关（R（2）= 0.7-0.95，P <0.05）;观察到这种余量，一致的风力转向，可归因于二级低频膨胀系统。这些结果表明，在近岸预测风力应力变异性仍然是持续存在的挑战，特别是在具有复杂波和当前场的位置。

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