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首页> 外文期刊>Journal of Physical Oceanography >Coastal Perturbations of Marine-Layer Winds, Wind Stress, and Wind Stress Curl along California and Baja California in June 1999
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Coastal Perturbations of Marine-Layer Winds, Wind Stress, and Wind Stress Curl along California and Baja California in June 1999

机译：1999年6月，加利福尼亚州和下加利福尼亚州海平面风，风应力和风应力卷曲的海岸扰动

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摘要

Month-long simulations using the fifth-generation Pennsylvania State University- National Center for Atmospheric Research Mesoscale Model (MM5) with a horizontal resolution of 9 km have been used to investigate perturbations of topographically forced wind stress and wind stress curl during upwelling-favorable winds along the California and Baja California coasts during June 1999. The dominant spatial inhomogeneity of the wind stress and wind stress curl is near the coast. Wind and wind stress maxima are found in the lees of major capes near the coastline. Positive wind stress curl occurs in a narrow band near the coast, while the region farther offshore is characterized by a broad band of weak negative curl. Curvature of the coastline, such as along the Southern California Bight, forces the northerly flow toward the east and generates positive wind stress curl even if the magnitude of the stress is constant. The largest wind stress curl is simulated in the lees of Point Conception and the Santa Barbara Channel. The Baja California wind stress is upwelling favorable. Although the winds and wind stress exhibit great spatial variability in response to synoptic forcing, the wind stress curl has relatively small variation. The narrow band of positive wind stress curl along the coast adds about 5% to the coastal upwelling generated by adjustment to the coastal boundary condition. The larger area of positive wind stress curl in the lee of Point Conception may be of first-order importance to circulation in the Santa Barbara Channel and the Southern California Bight.
机译：使用第五代宾夕法尼亚州立大学-国家大气研究中心的中尺度模型（MM5）进行了为期一个月的模拟，水平分辨率为9 km，用于研究在有利上升风场中地形强迫风应力和风应力卷曲的扰动在1999年6月，沿着加利福尼亚和下加利福尼亚州的海岸。风应力和风应力卷曲的主要空间不均匀性在海岸附近。在海岸线附近主要海角的泥土中发现了风和风应力最大值。正风应力卷曲发生在海岸附近的一个狭窄带中，而更远的海上区域则以较弱的负卷曲形成一个宽带。海岸线的曲率（例如沿着南加利福尼亚湾的弯曲）迫使北风向东流动，即使应力的大小恒定，也会产生正的风应力弯曲。在Point Conception和Santa Barbara Channel的背风中模拟了最大的风应力卷曲。下加利福尼亚州的风压正在上升。尽管风和风应力响应天气强迫表现出很大的空间变化性，但风应力卷曲具有相对较小的变化。沿海岸的正风应力卷曲的窄带使通过调整海岸边界条件而产生的海岸上升流增加了约5％。 Point Conception背风中较大的正风应力卷曲区域可能对圣塔芭芭拉海峡和南加州海岸线的环流具有重要意义。

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