Knowledge Management System Of Guangzhou Institute of Geochemistry,CAS
Li, Qiang1; Mao, Xianzhong1; Huthnance, John2; Cai, Shuqun3; Kelly, Samuel4,5 | |
On Internal Waves Propagating across a Geostrophic Front | |
刊名 | JOURNAL OF PHYSICAL OCEANOGRAPHY |
ISSN号 | 0022-3670 |
2019-05-01 | |
卷号 | 49期号:5页码:1229-1248 |
DOI | 10.1175/JPO-D-18-0056.1 |
语种 | 英语 |
WOS研究方向 | Oceanography |
摘要 | Reflection and transmission of normally incident internal waves propagating across a geostrophic front, like the Kuroshio or Gulf Stream, are investigated using a modified linear internal wave equation. A transformation from depth to buoyancy coordinates converts the equation to a canonical partial differential equation, sharing properties with conventional internal wave theory in the absence of a front. The equation type is determined by a parameter Delta, which is a function of horizontal and vertical gradients of buoyancy, the intrinsic frequency of the wave, and the effective inertial frequency, which incorporates the horizontal shear of background geostrophic flow. In the Northern Hemisphere, positive vorticity of the front may produce Delta <= 0, that is, a "forbidden zone," in which wave solutions are not permitted. Thus, Delta = 0 is a virtual boundary that causes wave reflection and refraction, although waves may tunnel through forbidden zones that are weak or narrow. The slope of the surface and bottom boundaries in buoyancy coordinates (or the slope of the virtual boundary if a forbidden zone is present) determine wave reflection and transmission. The reflection coefficient for normally incident internal waves depends on rotation, isopycnal slope, topographic slope, and incident mode number. The scattering rate to high vertical modes allows a bulk estimate of the mixing rate, although the impact of internal wave-driven mixing on the geostrophic front is neglected. |
关键词 | Internal waves Tides |
WOS记录号 | WOS:000466115700001 |
收录类别 | SCI |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gig.ac.cn/handle/344008/51020 |
通讯作者 | Kelly, Samuel |
作者单位 | 1.Tsinghua Univ, Grad Sch Shenzhen, Shenzhen, Peoples R China 2.Natl Oceanog Ctr, Liverpool, Merseyside, England 3.Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China 4.Univ Minnesota, Large Lakes Observ, Duluth, MN 55812 USA 5.Univ Minnesota, Dept Phys, Duluth, MN 55812 USA |
推荐引用方式 GB/T 7714 | Li, Qiang,Mao, Xianzhong,Huthnance, John,et al. On Internal Waves Propagating across a Geostrophic Front[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(5):1229-1248. |
APA | Li, Qiang,Mao, Xianzhong,Huthnance, John,Cai, Shuqun,&Kelly, Samuel.(2019).On Internal Waves Propagating across a Geostrophic Front.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(5),1229-1248. |
MLA | Li, Qiang,et al."On Internal Waves Propagating across a Geostrophic Front".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.5(2019):1229-1248. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论