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首页> 外文期刊>Progress in Oceanography >Particle dynamics of the surface, intermediate, and benthic nepheloid layers under contrasting conditions of summer monsoon and typhoon winds on the boundary between the Taiwan Strait and East China Sea
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Particle dynamics of the surface, intermediate, and benthic nepheloid layers under contrasting conditions of summer monsoon and typhoon winds on the boundary between the Taiwan Strait and East China Sea

机译：台湾海峡与东海交界处夏季风和台风的对比条件下，表层，中层和底栖星云的颗粒动力学

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Two shipboard surveys of hydrographics and sediment dynamics were conducted off the mouth of Minjiang (the Min River) in July 2012, under contrasting summer monsoon and typhoon wind conditions. Observations included profiles of conductivity, temperature, depth, fluorescence, and suspended-particle volume concentration and current velocity. In addition, water samples were taken for the analyses of mass concentration, POC, and chlorophyll of suspended sediment. Seafloor sediment samples were also taken for grain-size analysis. Nepheloid layers (NLs) were observed at surface, intermediate, and benthic depths (SNL, INL, BNL, respectively). The NL dynamics under the two wind conditions were mainly controlled by (1) the presence of the Minjiang river plume and terrigenous material it carries; (2) water-column stability affected by wind, current, and waves; (3) current-induced resuspension of seafloor sediment; and (4) physically coupled biological activities. The wind field was the major forcing controlling the observed flow field and the upper water column stability. In the typical summer condition, southerly winds induced offshore-directed currents, enhancing the seaward dispersal of the Minjiang river plume, facilitating water-column stratification, thereby forming 3 NLs in the water column. Phytoplankton growth was enhanced by terrigenous material and sunlight. The suspension of the seafloor sediment was the one of the major sources for suspended particles in these NLs. Furthermore, the CAN ratio of POC in the three NLs is 5.72, almost identical to the Redfield ratio, indicating their predominant marine origin. Conversely, under typhoon-related northerly winds, the offshore spread of the river plume was restricted. The reduced riverine input and enhanced mixing resulted in the disappearance of the SNL. Elevated turbidity in the INL was largely due to the presence of phytoplankton, while the BNL was comprised of sediment resuspended off the seafloor and from horizontal advection. Our results suggest that the presence of the river plume from the Minjiang at the study site sets the condition for the SNL dynamics. The dynamics of INL and BNL were dominated by the wind field, and to a lesser degree, the wave field and tidal current. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在夏季季风和台风的对比之下，2012年7月在江（the江）河口进行了两次船上水文和沉积物动力学调查。观察包括电导率，温度，深度，荧光以及悬浮颗粒体积浓度和电流速度的分布图。此外，还采集了水样以分析悬浮沉积物的质量浓度，POC和叶绿素。还采集了海底沉积物样本进行粒度分析。在表面深度，中间深度和底栖深度（分别为SNL，INL和BNL）观察到星状体层（NLs）。两种风况下的NL动力学主要受（1）Min江羽流及其携带的陆源物质的存在控制； （2）受风，海浪和波浪影响的水柱稳定性； （3）电流引起的海底沉积物的悬浮； （4）生理耦合的生物活动。风场是控制观测流场和上层水柱稳定性的主要推动力。在典型的夏季条件下，南风诱发了海上定向水流，增强了jiang江羽流的向海扩散，促进了水柱分层，从而在水柱中形成了3个NL。陆源性物质和阳光促进了浮游植物的生长。海底沉积物的悬浮液是这些NL中悬浮颗粒的主要来源之一。此外，三个NL中POC的CAN比率为5.72，几乎与Redfield比率相同，表明它们是主要的海洋起源。相反，在与台风有关的北风下，河羽的离岸扩散受到了限制。河流输入减少和混合增加导致SNL消失。 INL的浊度升高主要是由于浮游植物的存在，而BNL则是由重悬于海底和水平对流的沉积物组成。我们的结果表明，来自闽江的烟羽在研究现场的存在为SNL动力学奠定了条件。 INL和BNL的动力学主要由风场控制，在较小程度上由波场和潮流控制。 （C）2017 Elsevier Ltd.保留所有权利。

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