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Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary

机译：梨河河口沿海过渡带内缺氧形成的涡旋和生物地球化学动力学

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摘要

Satellite-derived chlorophyll data, in situ measurements, and time series buoy monitoring revealed the persistent and deteriorating seasonal eutrophication and hypoxia with two distinct centers in the coastal transition zone (CTZ) between the Pearl River Estuary and the adjacent continental shelf off Hong Kong. We used a process-oriented coupled physical-biogeochemical numerical model to investigate the intrinsic physical and biogeochemical dynamics under the extrinsic forcing of wind, river discharge, and tides for the hypoxia formation in the CTZ. We found that the convergence induced by cyclonic vortices in the CTZ, which were formed by the buoyancy-driven currents and wind-driven shelf currents, created the stable water column with weak mixing and long residence time and accumulated nutrients and organic matter for the eutrophication and hypoxia development. The biophysical responses to spring-neap cycle further demonstrated the coherent linkages of oceanic currents, vortex formation, and convergence of organic matter within the CTZ and indicated the critical role of mixing in the dissolved oxygen (DO) budgets during the spring-neap tidal cycle. The study found that biogeochemical substances and processes are necessary conditions for eutrophication and hypoxia formation, and when these necessary conditions are combined with the favorable hydrodynamic conditions, they form a sufficient condition for eutrophication and hypoxia formation in the CTZ.
机译：卫星衍生的叶绿素数据，原位测量和时间序列浮标监测揭示了诸如香港珍珠河口和邻近的陆地货架之间的沿海过渡区（CTZ）中的两个不同中心的持续和恶化的季节性富营养化和缺氧。我们使用了一个面向过程耦合的物理生物地球化学数值模型，以研究风力，河流放电和潮氧化CTZ中缺氧形成的内在迫使内在的物理和生物地球化学动态。我们发现，通过浮力驱动的电流和风力驱动的货架电流形成的CTZ中的循环涡流引起的收敛，产生稳定的水柱，具有弱混合和长的停留时间和富营养化的营养素和有机物质和缺氧发展。对Spring-NeAP循环的生物物理响应进一步证明了CTZ内有机物质的血管，涡旋形成和收敛性的相干键，并表明了在弹簧NeAP潮汐周期中混合在溶解的氧气（DO）预算中的关键作用。研究发现，生物地球化学物质和方法是富营养化和缺氧形成的必要条件，当这些必要条件与有利的流体动力学条件结合时，它们在CTZ中形成了足够的富营养化和缺氧形成的条件。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2135-2135|共1页
  • 作者

    D. Li; J. Gan; R. Hui;

  • 作者单位

    Division of Environment and Sustainability Hong Kong University of Science and Technology Hong Kong;

    Division of Environment and Sustainability Hong Kong University of Science and Technology Hong Kong;

    Division of Environment and Sustainability Hong Kong University of Science and Technology Hong Kong;

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