| LÜ Haibin,XIE Jieshuo,YAO Yuan,XU Jiexin,CHEN Zhiwu,HE Yinghui,CAI Shuqun. 2016. Effect of background parabolic current on characteristics and energetics of internal solitary waves by numerical simulation. Acta Oceanologica Sinica, 35(1):1－10 |
| Effect of background parabolic current on characteristics and energetics of internal solitary waves by numerical simulation |
| 抛物线型背景流对内孤立波特征和能量影响的数值模拟研究 |
| Received:April 30, 2015 Revised:July 29, 2015 |
| DOI：10.1007/s13131-016-0790-4 |
| Key words:internal solitary waves background current baroclinic energy South China Sea |
| 中文关键词: 内孤立波 背景流 斜压能 南海 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LÜ Haibin | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
School of Geodesy & Geomatics Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
University of Chinese Academy of Sciences, Beijing 100049, China 4 Qinhuangdao Marine Environmental Monitoring Central Station, State Oceanic Administration, Qinhuangdao 066002, China | | | XIE Jieshuo | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China 4 Qinhuangdao Marine Environmental Monitoring Central Station, State Oceanic Administration, Qinhuangdao 066002, China | | | YAO Yuan | Qinhuangdao Marine Environmental Monitoring Central Station, State Oceanic Administration, Qinhuangdao 066002, China | | | XU Jiexin | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | CHEN Zhiwu | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | HE Yinghui | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | CAI Shuqun | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | caisq@scsio.ac.cn |
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| Abstract: |
| Based on modifications of the observed background parabolic current in upper layer of the northeastern South China Sea (SCS), the effects of eight kinds of background currents on the characteristics and energy conversion of internal solitary waves (ISWs) are investigated by an Internal Gravity Wave (IGW) model. It is found that, although the background current has little effect on the number of the generated ISWs, it reduces the resulted phase speed of ISW. When the background parabolic current appears with its lower boundary near or above the main thermocline, the ISW amplitude and the depth of the isopycnal undergoing maximum displacement increase; when the background parabolic current curvature is reduced, the ISW amplitude and the ratio of baroclinic to barotropic energy reduce, whilst the phase speed of ISW, the baroclinic energy, and the ratio of baroclinic kinetic energy (KE) to available potential energy (APE) increase; when the lower boundary of background parabolic current extends down to the seabed and the background current curvature is reduced, the ISW amplitude and phase speed decrease, whilst the barotropic kinetic energy, the baroclinic energy and the ratio of KE to APE increase. At a whole depth, when the lower background current curvature is reduced and the upper current curvature is increased, the ISW amplitude, and phase speed, the ratio of baroclinic to barotropic energy, the baroclinic energy, and the ratio of KE to APE all increase. |
| 中文摘要: |
| 本文基于南海东北部观测的抛物线型背景流,设计了8种形式的抛物线型背景流,利用IGW模式研究了其对内孤立波(ISW)的特征和能量学的影响。研究结果表明:背景流对波包中ISW数目没有影响,但减小了ISW的相速度;对于下边界在主温跃层附近或在其上的抛物线型背景流,ISW振幅和最大位移深度均增加;随着抛物背景流曲率减小,ISW振幅、斜压与正压能比值减小,同时ISW相速度、正压能、斜压能、KE/APE都增加;如果抛物背景流底部延伸至海底,且曲率减小,则ISW振幅、相速度减小,同时正压能、斜压能、KE/APE增加;在整个深度上的背景流,随着下层曲率减小和上层曲率增大,ISW振幅、相速度、斜压与正压能比值、斜压能、KE/APE均增加。 |
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