Local inertial oscillations in the surface ocean generated by time-varying winds
Local inertial oscillations in the surface ocean generated by time-varying winds
复制标题
由时变风产生的表面海洋局部惯性振荡
DOI：
10.1007/s10236-015-0899-6
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发表时间：
2015-10
期刊：
影响因子：
2.3
通讯作者：
Xing Jiuxing
中科院分区：
文献类型：
--
作者：
Chen Shengli;Polton Jeff A.;Hu Jianyu;Xing Jiuxing
提出了一种新的关系，以对随时间变化的风应力局部产生的表面海洋惯性振荡的演化进行回顾研究。惯性振荡表示为先前振荡和新产生的振荡的叠加，这取决于随时间变化的风应力。这种关系用于研究一些理想化的风变化事件。对于以不同速率随时间变化的风系列，引起的惯性振荡由变化最大的风主导。共振风随时间以局部惯性频率反气旋旋转，产生单调增长的惯性振荡的最大幅度。对于以非惯性频率旋转的风，响应周期性变化，当风与水流同相时，风注入惯性能量，而当风异相时则消除惯性能量。随时间反气旋旋转的风比气旋式旋转风更有利于产生惯性振荡。频率接近惯性频率的风会产生更强的惯性振荡。对于昼间风，引起的惯性振荡取决于纬度，并且在 30° 处最显着。这种关系也适用于检查理想化的移动旋风分离器。气旋路径右侧的惯性振荡比左侧（北半球）强得多。这是因为随着时间的推移，右侧的风是反气旋性的，但另一侧的风是气旋性的。惯性振荡随旋风分离器平移速度而变化。产生最大惯性振荡的最佳平移速度在纬度 10° 处为 2 m/s，并在纬度 30° 处逐渐增加到 6 m/s。
A new relationship is presented to give a review study on the evolution of inertial oscillations in the surface ocean locally generated by time-varying wind stress. The inertial oscillation is expressed as the superposition of a previous oscillation and a newly generated oscillation, which depends upon the time-varying wind stress. This relationship is employed to investigate some idealized wind change events. For a wind series varying temporally with different rates, the induced inertial oscillation is dominated by the wind with the greatest variation. The resonant wind, which rotates anti-cyclonically at the local inertial frequency with time, produces maximal amplitude of inertial oscillations, which grows monotonically. For the wind rotating at non-inertial frequencies, the responses vary periodically, with wind injecting inertial energy when it is in phase with the currents, but removing inertial energy when it is out of phase. The wind rotating anti-cyclonically with time is much more favorable to generate inertial oscillations than the cyclonic rotating wind. The wind with a frequency closer to the inertial frequency generates stronger inertial oscillations. For a diurnal wind, the induced inertial oscillation is dependent on latitude and is most significant at 30 °. This relationship is also applied to examine idealized moving cyclones. The inertial oscillation is much stronger on the right-hand side of the cyclone path than on the left-hand side (in the northern hemisphere). This is due to the wind being anti-cyclonic with time on the right-hand side, but cyclonic on the other side. The inertial oscillation varies with the cyclone translation speed. The optimal translation speed generating the greatest inertial oscillations is 2 m/s at the latitude of 10 ° and gradually increases to 6 m/s at the latitude of 30 °.
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影响因子：
25.2
作者：
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通讯作者：
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