Global estimates of wind energy input to subinertial motions in the Ekman-Stokes layer
Global estimates of wind energy input to subinertial motions in the Ekman-Stokes layer
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DOI：
10.1007/s10872-007-0041-6
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发表时间：
2007-06
影响因子：
2.3
通讯作者：
B. Liu;K. Wu;Changlong Guan
中科院分区：
文献类型：
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作者：
B. Liu;K. Wu;Changlong Guan
通过将波浪引起的科里奥利-斯托克斯强迫纳入经典Ekman模型，研究了输入到Ekman-Stokes层的风能，重点研究了斯托克斯漂移方向偏离风应力方向时的面波效应。对Ekman-Stokes层动能平衡的理论分析表明，总的风能输入由直接风能输入和波浪引起的能量输入组成。讨论了直接风和波浪引起的能量输入的细节。根据ECMWF ERA-40重新分析风应力和表面波数据，全球埃克曼-斯托克斯层亚惯性运动输入的总风能输入估计为2.19 TW，其中包括0.26 TW（12%）波浪引起的能量输入和1.93 TW（88%）直接风能输入。还考虑了海冰覆盖对埃克曼-斯托克斯层能量输入的影响。结果表明，在不考虑海冰覆盖范围的情况下，全球总能量输入可能被高估0.08 TW（约4%）。
By incorporating the wave-induced Coriolis-Stokes forcing into the classical Ekman model, the wind energy input to the Ekman-Stokes layer is investigated, with an emphasis on the surface wave effects when the direction of Stokes drift deviates from that of wind stress. Theoretical analysis of the kinetic energy balance of the Ekman-Stokes layer shows that the total wind energy input consists of the direct wind energy input and the wave-induced energy input. Details of the direct wind and wave-induced energy input are discussed. Based on the ECMWF ERA-40 Re-Analysis wind stress and surface wave data, the global total wind energy input to subinertial motions in the Ekman-Stokes layer is estimated at 2.19 TW, including 0.26 TW (12%) wave-induced energy input and 1.93 TW (88%) direct wind energy input. The effect of sea-ice coverage on the energy input to the Ekman-Stokes layer is also considered. It is shown that the global total energy input could be overestimated by 0.08 TW (about 4%) without taking the sea-ice coverage into account.