南海北部陆坡海域第二模态内孤立波统计特征  

Statistical Analysis of the Second-mode Internal Solitary Wave in the Continental Slope Area of the Northern South China Sea

作　　者：许培鹏 熊学军 陈亮 宫庆龙 郭延良 于龙 吴凡 XU Pei-peng;XIONG Xue-jun;CHEN Liang;GONG Qing-long;GUO Yan-liang;YU Long;WU Fan(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China;First Institute of Oceanography,MNR,Qingdao 266061,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Key Laboratory of Marine Science and Numerical Modeling,MNR,Qingdao 266061,China;College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]自然资源部第一海洋研究所,山东青岛266061 [3]青岛科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室,山东青岛266237 [4]自然资源部海洋环境科学与数值模拟重点实验室,山东青岛266061 [5]中国海洋大学海洋与大气学院,山东青岛266100

出　　处：《海洋科学进展》2022年第2期187-196,共10页Advances in Marine Science

基　　金：国家科技重大专项——南海北部内波流监测、预报、预警系统研究及应用(2016ZX05057015);海洋工程装备科研项目——500米水深油田生产装备TLP自主研发-内波流预警方案研究及内波流监测系统研制;国家自然科学基金项目——黄海暖流的多时相特征及其发生机制研究(41376038);国家海洋局全球变化与海气相互作用专项子课题——黑潮结构时空变化特征对中国近海环流的影响分析(GASI-03-01-01-02)、黑潮不稳定性及多核结构(GASI-IPOVAI-01-05)和东印度洋南部水体综合调查夏季航次(GASI-02-IND-STSsum);国家自然科学基金青年基金项目——东海黑潮三维结构及季节变化研究(40406009)。

摘　　要：根据南海北部陆坡海域潜标观测数据,对该海域第二模态内孤立波统计特征进行分析。观测期间共发现72个第二模态内孤立波,包含101个第二模态内孤立波孤立子。该海域第二模态内孤立波以凸型为主,且最大振幅多为下凹振幅,占79.2%。KdV方程波速计算结果表明,波速可用三角函数描述,整体表现为夏季大、冬季小,且第二模态内孤立波流速呈明显的三层结构。最大流速深度及人工判别得到的上下层转向深度的统计结果表明:上层内波流流速转向平均深度约为97.7 m,中层内波流最大流速深度约为134.6 m,下层内波流转向平均深度约为204.2 m,内波流最大流速多发生在中层,流向主要为西北向,流速主要分布于0.2~0.8 m·s^(-1)区间范围内,占82.2%;上层流向主要为东南向,流速主要分布于0~0.6 m·s^(-1)区间范围内,占98.0%;中层流向主要为西北向,流速主要分布于0.2~0.8 m·s^(-1)区间范围内,占93.1%;下层流向主要为东南向,流速主要分布于0~0.4 m·s^(-1)区间范围内,占94.1%。本文系统性地给出了南海北部陆坡海域第二模态内孤立波统计特征,可为相关研究、水下航行及工程应用提供重要的资料和参考。The mode-2 internal solitary waves in the continental slope region of northern South China Sea are analyzed based on the mooring-observed ocean current data.During the observation period,a total of 72 mode-2 solitary waves were found,which includes 101 mode-2 solitons.The mode-2 internal solitary waves are mainly upward in upper layer and downward in lower layer,and the maximum amplitude occurs mostly in the downward part,which accounts for 79.2%.The wave speed is calculated with the KdV equation and can be described with cosine function,which is large in summer and small in winter.From the velocity profile,it can be found that the solitary wave velocity of the second mode has an obvious three-layer structure.In this paper,the maximum velocity depth and the turning depth of the upper and lower layers are calculated by manual discrimination.The statistical results show that the average turning depth of the upper internal wave flow is at 97.7 m,the maximum velocity depth of the middle internal wave flow is at 134.6m,and the average depth of the lower internal wave flow is at 204.2 m.The maximum flow velocity mostly occurred in the middle layer,accounting for 82.2%.The upper flow direction was mainly southeastward,and the velocity was mainly in the range of 0-0.6 m·s^(-1),accounting for 98.0%.The middle flow direction was mainly northwestward,and the velocity was mainly in the range of 0.2-0.8 m·s^(-1),accounting for 93.1%.The flow direction of the lower layer is mainly southeastward,and the velocity is mainly in the range of 0-0.4 m·s^(-1),accounting for 94.1%.This paper systematically presents the statistical characteristics of mode-2 solitary waves in the continental slope region of northern South China Sea,which provides a reference for future research.

关 键 词：第二模态内孤立波 陆坡海域 特征分析 转向深度 

分 类 号：P731[天文地球—海洋科学]