Poleward propagation of parametric subharmonic instability-induced inertial waves
Xie, Xiaohui; Liu, Qian; Shang, Xiaodong; Chen, Guiying; Wang, Dongxiao; Xie, XH; Shang, XD (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China.
2016
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号121期号:3页码:1881-1895
摘要This study presents two sets of current records obtained from the South China Sea and satellite altimeter data, and it suggests that near-inertial waves induced by parametric subharmonic instability (PSI) associated with internal tides can be transported poleward beyond their critical latitude phi(c) by background geostrophic flow (BGF). The two mooring locations were poleward of phi(c) (approximate to 14 degrees N) for diurnal subharmonics (0.5D(1); half diurnal frequency D-1); however, both of the current records revealed clear signals at 0.5D(1). The enhanced subinertial motion at 0.5D(1) exhibited a fortnightly spring-neap cycle but did not agree with that of D-1, indicating that it may not be generated via PSI associated with the local D-1. Observations from the altimeter data and a ray-tracing simulation suggested that these nonlocally generated 0.5D(1) waves may be excited near their phi(c), after which they propagated poleward under the role of the BGF to the observation site with a latitude higher than phi(c). The poleward propagation of near-inertial waves can produce elevated vertical shears; thus, it may play an important role in enhancing the local turbulent mixing.
部门归属[Xie, Xiaohui; Liu, Qian; Shang, Xiaodong; Chen, Guiying; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Liu, Qian] Univ Chinese Acad Sci, Beijing, Peoples R China ; LTO
学科领域Oceanography
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15555
专题热带海洋环境国家重点实验室(LTO)
通讯作者Xie, XH; Shang, XD (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China.
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GB/T 7714
Xie, Xiaohui,Liu, Qian,Shang, Xiaodong,et al. Poleward propagation of parametric subharmonic instability-induced inertial waves[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2016,121(3):1881-1895.
APA Xie, Xiaohui.,Liu, Qian.,Shang, Xiaodong.,Chen, Guiying.,Wang, Dongxiao.,...&Shang, XD .(2016).Poleward propagation of parametric subharmonic instability-induced inertial waves.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,121(3),1881-1895.
MLA Xie, Xiaohui,et al."Poleward propagation of parametric subharmonic instability-induced inertial waves".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121.3(2016):1881-1895.
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