Observations of Seasonal Variation in the Ekman Layer
Observations of Seasonal Variation in the Ekman Layer
复制标题
艾克曼层季节变化的观测
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Price
中科院分区：
文献类型：
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作者：
R. Schudlich;J. Price
翻译后摘要Ekman层的季节变化进行检查，使用长期的上层海洋研究（LOTUS），包括表面气象，电流和温度的观测。近地表电流被发现是相干的风在低频率（周期大于一天）。使用风的相对平均方法，作者发现所观察到的近地面体积传输是一致的埃克曼运输。平均电流剖面具有螺旋形状，与经典的埃克曼螺旋相比是平坦的，因为它比埃克曼螺旋随深度旋转得更少。平均海流e折在夏季超过12 m，冬季超过25 m，振幅衰减意味着涡动粘度分别为60 × 10−4和250 × 10−4 m2 s−1。日循环是夏季的主要变率模式，它决定了螺旋的垂直结构。在冬季，由于太阳辐射大大减少和强风，昼夜循环几乎不存在。一个顽固的...
Abstract The seasonal variation in the Ekman layer is examined using observations from the Long-Term Upper Ocean Study (LOTUS), including surface meteorology, current, and temperature. The near-surface current is found to be coherent with the wind at low frequencies (periods greater than one day). Using a wind-relative averaging method, the authors find the observed near-surface volume transport to be consistent with Ekman transport. The mean current profile has a spiral shape that is flat compared to the classic Ekman spiral in that it rotates less with depth than does the Ekman spiral. The mean current e-folds over 12 m in the summer and 25 m in the winter, with a decay in amplitude that implies eddy viscosities of 60 × 10−4 and 250 × 10−4 m2 s−1, respectively. Diurnal cycling is the dominant mode of variability in the summer and it determines the vertical structure of the spiral. In the winter, diurnal cycling is almost nonexistent due to greatly reduced solar insolation and stronger winds. A persisten...