海洋学研究 ›› 2022, Vol. 40 ›› Issue (3): 9-16.DOI: 10.3969-j.issn.1001-909X.2022.03.002

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琼州海峡自适应低通滤波之问

  

  1. 厦门大学 东山太古海洋观测与实验站,福建 厦门 361005
  • 出版日期:2022-09-15 发布日期:2022-09-15
  • 作者简介:李炎(1954—),男,福建省泉州市人,教授,主要从事河口海岸学研究,E-mail:liyan@xmu.edu.cn。
  • 基金资助:
    卫星海洋环境动力学国家重点实验室高端访问海星学者基金

Qiongzhou Strait as a self-adapted low-passing filter?

  1. Dongshan Swire Marine Station, Xiamen University, Xiamen 361005, China
  • Online:2022-09-15 Published:2022-09-15

摘要: 自1987年Wally Broecker 提出被称为“大洋传送带”的理想环流图后,温暖的上层环流如何贯穿印尼海域各式各样的海峡,成为地球海洋大气系统模型边界条件设定的难点。具有强烈非线性效应的狭窄浅水海峡,一方面形成垂向混合热点,另一方面因引入潮波共振单元,可使海峡通道呈现为具有自适应能力的低通滤波器。位于粤西海域与北部湾之间的琼州海峡,是沉积物充沛并具强潮流以及西向背景流的狭窄浅水海峡。半日分潮和浅水分潮共振单元的引入,有利于其潮流槽刷深与潮流三角洲堆积,维护互相适应的动力-地貌关系。台风过境和冷空气入侵等强扰动可引起琼州海峡的西向风暴射流,触发北部湾不同结构特征的高营养、藻华与缺氧事件。狭窄浅水海峡如何引入潮波共振单元支持,形成有利于低频流低阻通过的自适应低通滤波器,海峡沿岸人类活动能否影响到贯穿流行为,琼州海峡是一个值得关注的案例。


关键词: 琼州海峡, 潮波, 地貌, 滤波器, 风暴射流

Abstract: Since a diagram depicting "The Great Ocean Conveyor" was first appeared as a logo by Wally Broecker in 1987, how the warmed upper ocean circulation ran through the Indonesian Seas with their complex coastline geometry and narrow passages, known as the Indonesian through-flow, becomes one of the difficult settings in boundary conditions of climate change model. With strong nonlinear effect, a shallow narrow passage forms vertical mixed hotspots on the one hand, and on other hand, it becomes a self-adapted low-pass filter if the tidal resonance units are introduced. Qiongzhou Strait, a sufficient sediment supply and shallow narrow passage for the northern shelf of the South China Sea, is reported with strong tidal current and westward through-flow. And its tidal channel and tidal deltas are maintained by the tidal resonance units introduced themself. Strong disturbances such as typhoon and cold wave can cause storm jet flow through the strait, triggering different high nutrition, algal bloom and hypoxia events over the adjacent Beibu Gulf. Qiongzhou Strait seems to be a noteworthy case of studying how the self-adapted low-pass filter introduced and whether human activities can affect the through-flow on the shallow narrow passages.


Key words: Qiongzhou Strait, tide waves, geomorphology, filter, storm jet

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