Observations and analysis of environment and acoustic field changed by the passage of typhoon Damrey in the Yellow Sea in 2012

查看全文 作　　者：YANG [1,2,3]GuangBing;Lü [3]LianGang;YUAN [3]YeLi;JIANG [3]Ying;LIU [3]ZongWei;YANG [3]ChunMei;LIU [3]HongNing;CHEN [3]Zhao

机构地区：[1]South China Sea Institute of Oceanology, Chinese Academy of Sciences;[2]College of Earth Sciences, University of Chinese Academy of Sciences;[3]Key Laboratory of Marine Science and Numerical Modeling, The First Institute of Oceanography,State Oceanic Administration

出　　处：《Science China Earth Sciences》索引2015年第58卷第12期,共11页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U1406404;40806015) 摘　　要：In order to investigate the environment and acoustic filed change induced by typhoon in shallow sea, we conducted two experiments just before and after the passage of typhoon Damrey, which is the strongest to affect the area north of the Yangtze River since 1949, in the Yellow sea in 2012. The data show that the temperature of the whole water column increases dramatically except the sea surface layer after the passage of Damrey while the salinity decreases obviously. The thermocline deepens and weakens, which leads to a change of internal wave activity. The transmission losses(TL) of the two experiments show that the environment change induced by typhoon can increase the TL as large as 8 d B at a distance of 9.2 km and depth of 15 m. The scintillation index(SI) of the sound intensity is simulated to estimate the change of the effect of internal wave activity on acoustic field showing that the SI decreases to a half after the typhoon's passage. The normal mode structures of the two experiments are also significantly different due to the thermocline changes. In addition, the signal arrives earlier after the typhoon's passage due to the water temperature increase. 关键词：声场分析环境声场台风黄海长江以北地区信号到达时间数据显示表层温度

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Observations and analysis of environment and acoustic field changed by the passage of typhoon Damrey in the Yellow Sea in 2012

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