CAJ | 학술논문

南海是热带气旋多发的海域，热带气旋过境在海洋上层激发的近惯性振荡近年来备受关注。文章利用一个位于南海西北部的锚定声学多普勒流速剖面仪(ADCP)，检测到了热带气旋 Mirinae 由东向西横穿南海时在锚定点产生的显著的近惯性振荡。与以往研究热带气旋激发显著近惯性振荡的文献相较， Mirinae强度较低，移动速度较快，距离观测点较远。对ADCP所测流速进行旋转小波分析后的结果显示，处于这种条件下的Mirinae也在观测点激发了显著的近惯性振荡。研究发现， Mirinae自东向西横穿南海时，正处于南海冬季风盛行的时期， Mirinae北部旋臂与该盛行的东北季风方向一致，二者相融，东北季风强度增大，方向发生变化，间接使得主要在其控制下的观测点上方的风场在大小和方向上产生了突变，而且风速矢量随着时间也呈顺时针偏转，从而在锚定点产生显著的近惯性振荡。平板模式的结果支持这一观点。
남해시열대기선다발적해역，열대기선과경재해양상층격발적근관성진탕근년래비수관주。문장이용일개위우남해서북부적묘정성학다보륵류속부면의(ADCP)，검측도료열대기선 Mirinae 유동향서횡천남해시재묘정점산생적현저적근관성진탕。여이왕연구열대기선격발현저근관성진탕적문헌상교， Mirinae강도교저，이동속도교쾌，거리관측점교원。대ADCP소측류속진행선전소파분석후적결과현시，처우저충조건하적Mirinae야재관측점격발료현저적근관성진탕。연구발현， Mirinae자동향서횡천남해시，정처우남해동계풍성행적시기， Mirinae북부선비여해성행적동북계풍방향일치，이자상융，동북계풍강도증대，방향발생변화，간접사득주요재기공제하적관측점상방적풍장재대소화방향상산생료돌변，이차풍속시량수착시간야정순시침편전，종이재묘정점산생현저적근관성진탕。평판모식적결과지지저일관점。
A number of tropical cyclones are active in the South China Sea each year. Near-inertial oscillations (NIOs) induced by the passing of tropical cyclones in the upper ocean became a hot research topic recently. Based on an acoustic Doppler current profiler (ADCP) moored in the northwestern South China Sea, we observed prominent NIOs during tropical cyclone Mirinae crossing the South China Sea. Comparing with the tropical cyclones that induced significant NIOs in previous studies, Mirinae was weak, moving quickly and far from the mooring site. After rotary wavelet analysis on currents observed by the moored ADCP, we found that significant NIOs were also triggered by Mirinae. How did Mirinae trigger these significant NIOs? We found that winter monsoon prevailed in the South China Sea during Mirinae. The northerly wind of Mirinae had the same direction as the winter monsoon. So, the arrival of Mirinae enhanced the magnitude of winter monsoon and changed its direction, which indirectly changed the magnitude and direction of local winds above the mooring site mainly controlled by winter monsoon and also made the local winds turn clockwise. Prominent NIOs at the mooring site were thus induced by the changing of local winds. These results were verified by the results of a damped-slab model.