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基于实测资料的南海北部台风“海鸥”致近惯性振荡研究
引用本文:黄妍丹,许洁馨,刘军亮,陈植武,蔡树群. 基于实测资料的南海北部台风“海鸥”致近惯性振荡研究[J]. 热带海洋学报, 2018, 37(6): 16-25. DOI: 10.11978/2018014
作者姓名:黄妍丹  许洁馨  刘军亮  陈植武  蔡树群
作者单位:1. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 5103012. 中国科学院大学, 北京 100049;
基金项目:国家自然科学基金项目(41430964、41521005、41776005);中国科学院前沿科学重点研究计划(QYZDJ-SSW-DQC034)
摘    要:文章利用2014年9月南海东北部附近海域的A、B两个相距约20km的潜标数据, 分析了台风“海鸥”在南海东北部激发的近惯性振荡的垂向分布特征。结果表明, 台风过境在两站点激发了强烈的近惯性振荡, 其能量由海表向海洋内部传播; 近惯性能量在表层随着深度增加而增大, 最大值出现在次表层, 此后随着深度增加迅速衰减。但是两个观测站点的近惯性振荡垂向分布特征有较大的差别: A站点的近惯性振荡在不同深度上存在三个不同的垂向相速度, 而B站点的垂向相速度没有变化; 两站点的最大近惯性动能的大小及其所在深度不同, B站点比A站点的最大近惯性动能大15%左右。台风过后两个站点均出现由近惯性波f和半日内潮波D2非线性相互作用产生的次级波动fD2, 但其强度存在差异。台风后A站点fD2在不同深度上有不同的变化, fD2相互作用较弱; 而B站点的fD2在整个近惯性振荡影响深度内都是增强, 其fD2f频带的动能和流速在时空分布以及变化趋势上有较好的相关性。两站点的近惯性振荡垂向相速度以及次级波动fD2的不同可能是水体层结的差异和涡旋的影响所导致的。

关 键 词:近惯性振荡  波-波相互作用  台风  南海北部  
收稿时间:2018-01-25

A study of near-inertial oscillations in the northern South China Sea based on in-situ observations during the passage of Typhoon Kalmaegi
Yandan HUANG,Jiexin XU,Junliang LIU,Zhiwu CHEN,Shuqun CAI. A study of near-inertial oscillations in the northern South China Sea based on in-situ observations during the passage of Typhoon Kalmaegi[J]. Journal of Tropical Oceanography, 2018, 37(6): 16-25. DOI: 10.11978/2018014
Authors:Yandan HUANG  Jiexin XU  Junliang LIU  Zhiwu CHEN  Shuqun CAI
Affiliation:1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China2. University of Chinese Academy of Sciences, Beijing 100049, China;
Abstract:In this study, the vertical characteristics of near-inertial oscillations (NIOs) induced by Typhoon Kalmaegi are analyzed by using data from two moorings about 20 km apart in the northeastern South China Sea in Sept. 2014. The results show that the energy of typhoon-induced NIOs, which propagates downward into the ocean interior, increases with depth in the upper layer and becomes maximum in the mid layer before dissipating with depth. However, we find that there is a large difference in vertical characteristics of typhoon-induced NIOs between the two moorings. The NIOs at mooring A had three different vertical phase velocities at different depths while the NIOs at mooring B showed invariable phase velocity. The value and depth of the maximum near-inertial kinetic energy (NIKE) are also different at the two moorings. The maximum NIKE was 15% greater at mooring B than at mooring A. After the passage of Kalmaegi, fD2 via nonlinear wave interaction between f and D2 occurred at the two moorings, except that the intensities of fD2 at the two moorings were different. At mooring A, fD2 changed with depth and its interaction between f and D2 was weak. The energy of fD2 at mooring B enhanced at the full depth, and the kinetic energy and velocities of fD2 and f had a good correlation for their time-space distributions and variations. The difference of vertical phase velocity of NIOs and fD2 at the two moorings may be caused by the effects of eddy and different stratifications.
Keywords:near-inertial oscillations  wave-wave interaction  typhoon  the northern South China Sea  
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