LTO学术报告2021-4

热带海洋环境国家重点实验室学术报告(2021-4) 
 
报告题目1:Dynamics of Cross-shelf exchanges in the Northern South China Sea 
报告人:刘志强博士,香港科技大学海洋环境学博士,南方科技大学海洋科学与工程系助理教授,主要从事西北太平洋-中国海中多尺度物理海洋动力过程、变异及其调控机理的观测研究和数值模拟。经过十多年专注于中国海多尺度动力过程的深入研究,对中国海陆架、陆坡流的特征、变化规律和调制机制都有了深入、全面认识。2013年至2020年,围绕中国海环流动力过程,跨陆架/陆坡输运动力机制研究,多尺度海洋环流数值模拟等方面在海洋动力学主流期刊发表研究论文24篇,其中12篇为第一或通讯作者,研究成果得到国内外科学家认可。申请人从2015年起,连续多年带队执行南海北部海盆-陆坡-陆架多学科综合性现场调查航次,获取丰富的第一手调查资料和科学认识,支撑了合作团队大量跨学科研究。
报告摘要:南海北部陆架流是中国沿岸流的重要组成部分,沟通从海南东侧陆坡到台湾海峡的广阔南海北部和东海南部陆架水体,跨陆架水交换是华南近海水体更新的重要载体,极大程度决定了粤港澳大湾区海洋环境健康。本报告基于数值模式和现场观测结果,从环流动力学和涡动力学角度梳理调控南海北部跨陆架水交换的动力机制,探讨南海北部陆架流与台湾海峡交换流及南海北部陆坡流之间的连接性问题,提出陆架流对蜿蜒地形的响应是调控水体跨陆架水交换的重要动力因素。

  
报告题目2:Kinetic Energy Pathway of the Layered Circulation in South China Sea 
报告人:蔡忠亚博士,香港科技大学海洋环境学博士学位,澳门大学土木及环境工程系,智慧城市物联网国家重点实验室助理教授,以海洋环流和动力机制为中心,主要从事南海多尺度环流/陆坡流、跨陆坡-陆架输运、近海环境问题和海洋数值模拟等方面研究,对相关动力过程有深入认识。相关研究成果在国际主流海洋期刊发表论文12篇。 
报告摘要:We investigated the mean kinetic energy (MKE) and eddy kinetic energy (EKE) in the South China Sea to illustrate the dynamics of the vertically rotating layered circulation in the upper, middle, and deep layers. We found that strong MKE along the basin slope and the associated EKE arising from the vertical shear and stratification of the mean current characterize the circulation. In the upper layer, the external MKE input from the Kuroshio intrusion and wind forcing drive the cyclonic circulation, with the wind forcing providing most of the EKE. External forcing, however, does not directly provide the MKE and EKE of the CAC circulation in the semi-enclosed middle and deep layers, where the internal pressure work near Luzon Strait and the vertical buoyancy flux (VBF) in the southern basin and along the western slope maintain the MKE and EKE. The internal pressure work is formed by ageostrophic motion and pressure gradient field associated with circulation. The VBF is generated by vertical motion induced by the geostrophic cross-isobath transport along the slope where variable density field is maintained by the external flow and the internal mixing. The kinetic energy pathway in the CAC circulation indicates that the external forcing dominates upper layer circulation and the coupling between internal and external dynamics is crucial for maintaining the circulation in the middle and deep layers. This study provides a new interpretation to the maintenance of CAC circulation from energy prospect. 
 
会议时间:2021年3月26日(周五)上午9:00
线下会议地点:2号楼1706会议室 
线上腾讯会议ID:134 866 339  腾讯会议链接:https://meeting.tencent.com/s/uDJIU3M4F1Yy
主持人:舒业强研究员

欢迎各位参加!

附件下载: