Inertial oscillations of Fletcher's Ice Island (T‐3)
Inertial oscillations of Fletcher's Ice Island (T‐3)
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DOI：
10.1029/jz072i004p01165
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发表时间：
1967-02
影响因子：
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通讯作者：
K. Hunkins
中科院分区：
文献类型：
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作者：
K. Hunkins
利用改进的罗伯茨海流计、系绳垂管和深度图亮点进行的观测表明，北冰洋的弗莱彻冰岛(T-3)经常顺时针方向运动，直径约1公里，周期约12小时。这些运动是惯性振荡，代表了漂浮冰块对变化的风应力的瞬时响应。由于风经常起伏不定，T-3经常以惯性运动响应。这些运动是惯性振荡：(1)在这个纬度，运动周期更接近12.05小时的惯性周期，而不是接近12.42小时的月球半日潮周期；(2)周期运动的幅度与当地风速密切相关；(3)运动的相位随时间不规则变化；(4)运动仅限于冰层和最上层的水。
Observations with improved Roberts current meters, tethered drogues, and fathogram highlights are used to show that Fletcher's Ice Island (T-3), in the Arctic Ocean, often moves in clockwise circles with a diameter of about 1 km and a period of about 12 hours. The motions are inertial oscillations which represent the transient response of a floating ice mass to changing wind stress. Since the winds are often fluctuating, T-3 responds often with inertial motion. The following arguments indicate that these motions are inertial oscillations: (1) the period of the motions is closer to the inertial period, at this latitude, of 12.05 hr than it is to the lunar semidiurnal tidal period of 12.42 hr; (2) the amplitude of the periodic motion and the local wind speed are closely correlated; (3) the phase of the motion changes irregularly with time; and (4) the motion is restricted to the ice and to the uppermost layers of water.