A possible generation mechanism of the strong current over the northwestern shelf of the South China Sea  

作　　者：WANG Gang QIAO Fangli DAI Dejun HOU Yijun 

机构地区：[1]Key laboratory of Data Analysis and Applications （LDAA）, Key laboratory of Marine Science and Numerical Modeling （MASNUM）, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China [2]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

出　　处：《Acta Oceanologica Sinica》2011年第3期27-32,共6页海洋学报（英文版）

基　　金：the National Natural Science Foundation of China under contract Nos 41006018 and 40730842;The National Basic Research Program(973 Program)of China under contract No.2011CB403502;the National High Technology Research and Development Program(863 Program)of China under contract No.2008AA09A402;Open Fund of the Key Laboratory of Ocean Circulation and Waves;Chinese Academy of Sciences under contract No.KLOCAW0905

摘　　要：Continuous observation in late April 2005 on the northwestern shelf of the South China Sea reveals vigorous strong currents, the maximum velocity of which exceeds 3.8 m/s. The strong currents occurred around spring tide period, when the internal tide waves were also expected to be vigorous. Analysis shows that the major peaks of the current power spectrum are in low frequency band. Using a numerical method applied to the actual ocean stratification, we find that the amplitude profiles of the strong current are similar to that of the currents induced by some low-mode internal waves （at diurnal or semi-diurnal frequency）. It indicates that the temporal and spatial features of strong currents were possibly induced by low frequency internal waves.Continuous observation in late April 2005 on the northwestern shelf of the South China Sea reveals vigorous strong currents, the maximum velocity of which exceeds 3.8 m/s. The strong currents occurred around spring tide period, when the internal tide waves were also expected to be vigorous. Analysis shows that the major peaks of the current power spectrum are in low frequency band. Using a numerical method applied to the actual ocean stratification, we find that the amplitude profiles of the strong current are similar to that of the currents induced by some low-mode internal waves （at diurnal or semi-diurnal frequency）. It indicates that the temporal and spatial features of strong currents were possibly induced by low frequency internal waves.

关 键 词：strong current internal waves Brunt-Vaisala frequency 

分 类 号：P736.1[天文地球—海洋地质] TM933.31[天文地球—海洋科学]