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首页> 外文期刊>Ocean Dynamics >Controls on the interannual variability of hypoxia in a subtropical embayment and its adjacent waters in the Guangdong coastal upwelling system, northern South China Sea
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Controls on the interannual variability of hypoxia in a subtropical embayment and its adjacent waters in the Guangdong coastal upwelling system, northern South China Sea

机译：南海北部广东沿海上升流系统中亚热带气藏及其附近海域缺氧年际变化的控制

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摘要

Coastal embayments located downwind of large rivers under an upwelling-favorable wind are prone to develop low-oxygen or hypoxic conditions in their bottom water. One such embayment is Mirs Bay, off the Guangdong coast, which is affected by upwelling and the Pearl River Estuary (PRE) plume during summer. The relative importance of physical and biochemical processes on the interannual variability of hypoxia in Mirs Bay and its adjacent waters was investigated using statistical analyses of monthly hydrographic and water quality monitoring data from 2001 to 2015. The results reveal that the southwesterly wind duration and the PRE river discharge together explain 49% of the interannual variability in the size of the hypoxic area, whereas inclusion of the nutrient concentrations inside Mirs Bay and phytoplankton on the shelf explains 75% of the interannual variability in the size of the hypoxic area. This finding suggests that the interannual variability of hypoxia in Mirs Bay is regulated by coupled physical and biochemical processes. Increase of the hypoxic area under a longer-lasting southwesterly wind is caused by increased stratification, extended bottom water residence time, and onshore transport of a low-oxygen water mass induced by stable upwelling. In contrast, a reduction in the size of the hypoxic area may be attributed to a decrease in the surface water residence time of the particulate organic matter outside Mirs Bay due to increased discharge from the PRE. The results also show that the effects of allochthonous particulate organic matter outside Mirs Bay on bottom hypoxia cannot be neglected.
机译：在上升气流有利的情况下，位于大河下游的沿海堤坝易于在其底水中形成低氧或低氧的条件。此类浮雕之一是广东沿岸的大鹏湾，该岛在夏季受到上升流和珠江口（PRE）羽流的影响。使用2001年至2015年每月水文和水质监测数据的统计分析，研究了物理和生化过程对Mirs湾及其附近水域缺氧年际变化的相对重要性。结果表明，西南风持续时间和PRE河流排放量共同解释了低氧区域面积的年际变化的49％，而在Mirs湾和架子上浮游植物内部的养分含量的包含说明了低氧区域面积的年际变化的75％。这一发现表明，大鹏湾缺氧的年际变化受到物理和生化过程耦合的调节。在更长时间的西南风下，缺氧面积的增加是由于分层增加，底部水停留时间延长以及稳定上升流引起的低氧水团在陆地上的运输所致。相反，缺氧区域的尺寸减小可归因于由于从PRE中排出的增加而使Mirs湾外的颗粒有机物的表面水停留时间减少。结果还表明，不能忽略Mirs湾以外的异质颗粒有机物对底部缺氧的影响。

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  • 来源
    《Ocean Dynamics》 |2018年第8期|923-938|共16页
  • 作者

    Zhang Heng; Cheng Weicong; Chen Yuren; Yu Liuqian; Gong Wenping;

  • 作者单位

    Sun Yat Sen Univ, Sch Marine Sci, Ctr Coastal Ocean Sci & Technol Res, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Marine Sci, Ctr Coastal Ocean Sci & Technol Res, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Marine Sci, Ctr Coastal Ocean Sci & Technol Res, Guangzhou 510275, Guangdong, Peoples R China;

    Dalhousie Univ, Dept Oceanog, Halifax, NS B3H 4R2, Canada;

    Sun Yat Sen Univ, Sch Marine Sci, Ctr Coastal Ocean Sci & Technol Res, Guangzhou 510275, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Mirs Bay; Pearl River estuary; Hypoxia; Upwelling; Plume; Southwesterly wind duration;

    机译：大鹏湾;珠江河口;低氧;上升流;羽流;西南风持续时间;

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