Dissipative Energization of Baroclinic Waves by Surface Ekman Pumping
Dissipative Energization of Baroclinic Waves by Surface Ekman Pumping
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表面埃克曼泵浦斜斜波的耗散能量
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发表时间：
2010
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通讯作者：
Sukyoung Lee
中科院分区：
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作者：
Sukyoung Lee
使用两层准地转模型来研究下边界埃克曼泵浦对斜压波能量学的影响。尽管 Ekman 泵浦的直接影响是抑制总涡流能量，但涡流可用势能 (EAPE) 或涡流动能 (EKE) 会因 Ekman 泵浦而单独增长。如果上下波场之间的相位差小于四分之一波长，则有利于EAPE的生长；如果相位差大于四分之一波长，则有利于EKE的生长。数值模型计算表明，EAPE 的增长直接通过 Ekman 泵送发生，并且增加的 EAPE 反过来可以通过加强从纬向可用势能到 EAPE 的斜压能量转换而导致进一步的增长。通过这种间接效应，埃克曼泵浦可以增加总涡流能量的净产生。
A two-layer quasigeostrophic model is used to study the effect of lower boundary Ekman pumping on the energetics of baroclinic waves. Although the direct impact of the Ekman pumping is to damp the total eddy energy, either the eddy available potential energy (EAPE) or the eddy kinetic energy (EKE), individually, can grow because of the Ekman pumping. Growth of EAPE is favored if the phase difference between the upper and lower wave fields is less than a quarter wavelength, and EKE is favored if the phase difference is greater than a quarter wavelength. A numerical model calculation shows that the EAPE growth occurs directly through the Ekman pumping and that the increased EAPE can in turn lead to further growth by strengthening the baroclinic energy conversion from zonal available potential energy to the EAPE. Through this indirect effect, the Ekman pumping can increase the net production of total eddy energy.