Yingyu Peng , Di Tian , Feng Zhou , Han Zhang , Shengming Yuan , Zifei Chen , Ruijie Ye
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引用次数: 0
摘要
在孟加拉湾南部(BoB)的地下系泊观测到两个连续的强近惯性波(NIWs)事件。第一个事件由两个连续的热带气旋直接触发,表现出明显的上升(下降)阶段(能量)传播。第二次事件发生在热带气旋后约14天,主要是向下相传播,在120 m深度的峰值速度为11.2 cm/s。尽管在第二次事件中风力产生的近惯性能量通量(WNEF)较弱,但在反气旋涡(ACE)上层观测到较强的能量反射。利用旋转波数和射线追踪模型进行分析,发现能量向上传播,浮力频率降低,垂直切变增强,表明NIW在ACE内反射。非线性内波相互作用被认为是产生2f = f + f波的机制。在第二次NIWs事件中,近惯性能量的增加和2f波的形成可能与局地NIWs有关,这是由风应力输入和NIWs在反气旋涡不稳定性引起的调整过程中的辐射所驱动的。这些结果突出了ace对NIWs垂直传播的影响,并加深了对bobs南部高层混合过程的理解。
Reflections of tropical cyclone-generated near-inertial internal waves within an anticyclonic eddy in the southern Bay of Bengal
Two consecutive strong near-inertial waves (NIWs) events were observed by a subsurface mooring in the southern Bay of Bengal (BoB). The first event, directly triggered by two consecutive tropical cyclones, displayed a pronounced upward (downward) phase (energy) propagation. The second event, occurring approximately 14 days post-tropical cyclones, featured predominant downward phase propagation with a peak velocity of 11.2 cm/s at 120 m depth. Despite weak wind-generated near-inertial energy flux (WNEF) during the second event, stronger energy reflection was observed in the upper layer of an anticyclonic eddy (ACE). Analyses using rotary wavenumber and ray-tracing models revealed upward propagating energy, reduced buoyancy frequency, and enhanced vertical shear, suggesting NIW reflection within the ACE. Nonlinear internal wave interactions were identified as the mechanism behind the generation of 2f = f + f waves. In the second NIWs event, increased near-inertial energy and 2f wave formation were possibly linked to local NIWs, driven by wind stress input and the radiation of NIWs during the adjustment process induced by anticyclonic eddy instability. These results highlight the influence of ACEs on the vertical propagation of NIWs and enhance the understanding of the upper-layer mixing process in the southern BoB.
期刊介绍:
Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.