Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea

查看全文 作　　者：YANG [1,2,3]Bing;HOU [1,2]Yijun

机构地区：[1]Institute of Oceanology,Chinese Academy of Sciences;[2]Key Laboratory of Chinese Academy of Sciences for Ocean Circulation and Waves,Institute of Oceanology;[3]University of Chinese Academy of Sciences

出　　处：《Acta Oceanologica Sinica》索引2014年第33卷第11期,共10页

基　　金：The National Natural Science Foundation of China under contract Nos U1133001,41030855 and 41376027;the National High Technology Research and Development Program(863 Program)of China under contract No.2013AA09A502 摘　　要：In September 2011, Typhoon Nesat passed over a moored array of instruments recording current and temperature in the northern South China Sea(SCS). A wake of baroclinic near-inertial waves(NIWs) commenced after Nesat passed the array. The associated near-inertial currents are surface-intensified and clockwise-polarized. The vertical range of NIWs reached 300 m, where the vertical range is defined as the maximum depth of the horizontal near-inertial velocity 5 cm/s. The current oscillations have a frequency of 0.709 9 cycles per day(cpd), which is 0.025 f higher than the local inertial frequency. The NIWs have an e-folding time-scale of 10 d based on the evolution of the near-inertial kinetic energy. The depth-leading phase of near-inertial currents indicates downward group velocity and energy flux. The estimated vertical phase velocity and group velocity are 0.27 and 0.08 cm/s respectively, corresponding to a vertical wavelength of 329 m. A spectral analysis reveals that NIWs act as a crucial process to redistribute the energy injected by Typhoon Nesat. A normal mode and an empirical orthogonal function analysis indicate that the second mode has a dominant variance contribution of 81%, and the corresponding horizontal phase velocity and wavelength are 3.50 m/s and 420 km respectively. The remarkable large horizontal phase velocity is relevant to the rotation of the earth, and a quantitative analysis suggests that the phase velocity of the NIWs with a blue-shift of 0.025 f overwhelms that of internal gravity waves by a factor of 4.6. 关键词：惯性动能中国南海台风经验正交函数分析电流振荡相位速度群速度相速度

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Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea

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