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首页> 外文期刊>Journal of marine systems: journal of the European Association of Marine Sciences and Techniques >The influence of coastal upwelling and a river plume on the subsurface chlorophyll maximum over the shelf of the northeastern South China Sea
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The influence of coastal upwelling and a river plume on the subsurface chlorophyll maximum over the shelf of the northeastern South China Sea

机译：沿海上升流和河羽对南海东北部陆架下表层叶绿素最大值的影响

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摘要

Frequently observed subsurface chlorophyll maximum (SCM) contributes substantial biomass to the waters over the continental shelf of the northeastern South China Sea (NSCS) but it has not been sufficiently investigated. In this study, observations and a three-dimensional coupled physical-biological numerical model were utilized to investigate the characteristics of the SCM under strong controls of coastal upwelling circulation and the Pearl River plume in the NSCS. The model captures the observed characteristics of the SCM in the NSCS reasonably well. Both the depth and intensity of the SCM are spatially variable and regulated by the variable upwelling circulation and associated plume distribution over the complex shelf topography. In nearshore waters, the SCM shoals and weakens towards the coast as a result of the upwelling of high nutrient low chlorophyll deep water while surface productivity is enhanced. The intensity of the SCM weakens when the surface layer is covered by the river plume because of the substantial reduction of photosynthetic active radiation (PAR). Strengthening upwelling-favorable wind weakens the intensity of the SCM due to dilution by the enhanced mixing, but the SCM depth remains relatively stable in the offshore water as a result of no apparent shift of the nutricline. Changing incident PAR leads to an interactive response in chlorophyll concentration, nutricline, and the depth of the SCM.
机译：经常观察到的地下叶绿素最大值（SCM）为南海东北部（NSCS）大陆架上的水域贡献了大量生物量，但尚未对此进行充分研究。在这项研究中，利用观测资料和三维耦合生物生物学数值模型研究了在NSCS沿岸上升流和珠江羽流强烈控制下的SCM特征。该模型可以很好地捕获NSCS中SCM的观测特征。 SCM的深度和强度在空间上都是可变的，并且受复杂的架子地形上可变的上升流和相关羽流分布的调节。在近岸水域，由于高营养低叶绿素深水的上升，SCM向海岸浅滩和减弱，同时提高了地表生产力。当表层被河羽覆盖时，SCM的强度会减弱，这是因为光合有效辐射（PAR）大大降低了。由于向上混合有利于稀释，加强有利于上升的风减弱了SCM的强度，但是由于营养成分没有明显变化，因此在离岸水中SCM深度保持相对稳定。入射PAR的变化会导致叶绿素浓度，营养素和SCM深度的相互作用。

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