A Locally Generated High‐Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations

Tang Qunshu; Xu Min; Zheng Chan; Xu Xing; Xu Jiang

摘要

Abstract >In this work, a secondary nonlinear internal wave (NIW) on the continental shelf of the northern South China Sea is investigated using high‐resolution seismic imaging and joint inversion of water structure properties combined with in situ hydrographic observations. It is an extraordinary wave combination with two mode‐2 NIWs and one elevated NIW occurring within a short distance of 2 km. The most energetic part of the NIW could be regarded as a mode‐2 NIW in the upper layer between 40 and 120 m depth. The vertical particle velocity of ～41 cm/s may exceed the critical value of wave breaking and thus collapse the strong stratification followed by a series of processes including internal wave breaking, overturning, Kelvin‐Helmholtz instability, stratification splitting, and eventual restratification. Among these processes, the shear‐induced Kelvin‐Helmholtz instability is directly imaged using the seismic method for the first time. The stratification splitting and restratification show that the unstable stage lasts only for a few hours and spans several kilometers. It is a new observation that the elevated NIW could be generated in a deepwater region (as deep as ～370 m). Different from the periodical NIWs originating from the Luzon Strait, this secondary NIW is most likely generated locally, at the continental shelf break during ebb tide. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”> <标题类型=“main”>摘要</ title> >在这项工作中，使用高级南海大陆架上的二级非线性内部波（NiW） - 水结构性能的抗震地震成像和联合反演与原位文影观察相结合。它是一种非凡的波组合，与两个模式-2 niws和一个高距离发生在2公里的短距离内。 NIW最精力充沛的部分可以被视为在40到120米的上层中的模式-2 NIW。〜41cm / s的垂直粒子速度可能超过波破碎的临界值，从而坍塌强烈的分层，然后崩溃，然后是一系列过程，包括内部波破碎，倾覆，kelvin-helmholtz不稳定性，分层分裂和最终rescatification。在这些过程中，首次使用地震方法直接成像剪切诱导的Kelvin-Helmholtz不稳定性。分层分裂和restification表明，不稳定的阶段仅持续几个小时并跨越几公里。这是一种新的观察，即在深水区（深至370米深）可以产生升高的NIW。与源自吕宋海峡的期刊NIW不同，这种次级NIW最有可能在局部地区生成，在潮汐潮中的大陆架休息。</ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-34643/'>《Journal of Geophysical Research, C. Oceans: JGR》</a> <b style="margin: 0 2px;">|</b><span>2018年第2期</span><b style="margin: 0 2px;">|</b><span>共14页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Tang Qunshu&option=202" target="_blank" rel="nofollow">Tang Qunshu;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Xu Min&option=202" target="_blank" rel="nofollow">Xu Min;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zheng Chan&option=202" target="_blank" rel="nofollow">Zheng Chan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Xu Xing&option=202" target="_blank" rel="nofollow">Xu Xing;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Xu Jiang&option=202" target="_blank" rel="nofollow">Xu Jiang;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>CAS Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of OceanologyGuangzhou China;</p> <p>CAS Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of OceanologyGuangzhou China;</p> <p>College of Mathematics and InformaticsSouth China Agricultural UniversityGuangzhou China;</p> <p>MLR Key Laboratory of Marine Mineral ResourcesGuangzhou Marine Geological SurveyGuangzhou China;</p> <p>SOA Open Laboratory of Ocean and Coast GeologyThird Institute of OceanographyXiamen China;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=internal solitary wave&option=203" rel="nofollow">internal solitary wave;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kelvin‐Helmholtz instability&option=203" rel="nofollow">Kelvin‐Helmholtz instability;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=internal wave breaking&option=203" rel="nofollow">internal wave breaking;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic oceanography&option=203" rel="nofollow">seismic oceanography;</a> </p> <div class="translation"> 机译：内部孤波;凯尔文 - 亥姆霍兹不稳定性;内部波断裂;地震海洋学; </div> </li> </ul> </div> </div> <div class="literature cardcommon" id="literaturereference" style="display:none"> <div class="similarity "> <h3 class="all_title" id="enpatent111">引文网络</h3> <div class="referencetab clearfix"> <ul id="referencedaohang"> <li dataid="referenceul">参考文献</li> <li dataid="citationul">引证文献</li> <li dataid="commonreferenceul">共引文献</li> <li dataid="commoncitationul">同被引文献</li> <li dataid="tworeferenceul">二级参考文献</li> <li dataid="twocitationul">二级引证文献</li> </ul> </div> <div class="reference_details" id="referenceList"> <ul id="referenceul"></ul> <ul id="citationul"></ul> <ul id="commonreferenceul"></ul> <ul id="commoncitationul"></ul> <ul id="tworeferenceul"></ul> <ul id="twocitationul"></ul> </div> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704025579971.html">A Locally Generated High‐Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Tang Qunshu&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Tang Qunshu,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Xu Min&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Xu Min,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zheng Chan&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Zheng Chan,</a> <a href="/journal-foreign-34643/" target="_blank" rel="nofollow" class="tuijian_authcolor">Journal of Geophysical Research, C. 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