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首页> 外文期刊>Geo-marine letters >Aeration-induced marine sediment acidification in the vicinity of Rizhao Port, western Yellow Sea
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Aeration-induced marine sediment acidification in the vicinity of Rizhao Port, western Yellow Sea

机译：曝气诱导的海洋沉积物酸化在日照港口附近，西黄海

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Two short-term summer cruises were performed in the vicinity of Rizhao Port, western Yellow Sea, to investigate summer water stratification and the phenomenon of marine sediment acidification. Results show that water stratification has formed as early as in May. The chemoclines of dissolved oxygen (DO) and pH usually occur deeper than the thermocline. Sometimes the chemoclines of DO and pH occur synchronously at the same depths, but sometimes they do not synchronize. Above the chemocline DO fluctuates markedly and maintains at a high level or even oversaturation in daytime, suggesting the far-field impact of vessel propulsion. Below the chemocline it invariably remains at a low and stable level and slowly drops downward. The pH values of surface sediments vary in the range of 6.3-7.6. A conspicuous sediment acidification is observed along the navigation region. This phenomenon is chiefly attributed to the intermittent disruption of summer stratification by shipping activity along the shipping channel and waterways. Water stratification precludes the penetration of DO down to the bottom sediments on fair ocean status, and maintains anoxia below the sediment-water interface, whereas the abrupt DO increase driven by propeller agitating is nearly restricted in the navigation area. Therefore, the aeration effect accelerating oxidation of reducing substances and organic matter is primarily responsible for enhanced acid accumulation in surface sediments. In addition, the suspension effect is identified by the negative offsets of zero point on pH-mV diagram. Most of the measured points are scattered correspondingly on three distinct regression lines, with similar slopes but different negative offsets of pH 6.53, 6.87, and 6.99, respectively. Their geographical distribution suggests that this effect has a positive relationship with the intensity of anthropogenic disturbance. Although the suspension effect is caused by the adsorption of charged particles at the pH glass electrode interface (Yang et al. in Part Sci Technol 7:139-152,1989), its various intensity observed in practice may also reflect the inherent distinction of depositional environments in physicochemical conditions.
机译：在西黄海的日照港口附近进行两次短期夏季游轮，以调查夏季水分和海洋沉积物酸化的现象。结果表明，早于5月份的水分已经形成。溶解氧（DO）和pH的化学线通常比热管更深。有时，DO和pH的化学链接在相同的深度同步发生，但有时它们不同步。在Chemocline上面确实波动明显波动，在白天的高水平甚至过度保持，表明血管推进的远场影响。下面的化学干线下面，它总是保持在低且稳定的水平下，并慢慢向下滴下。表面沉积物的pH值在6.3-7.6的范围内变化。沿导航区域观察到显眼的沉积物酸化。这种现象主要归因于沿航运渠道和水道的运输活动间歇性破坏夏季分层。水分层绝不能渗透到公平海洋地位上的底部沉积物，并在沉积物 - 水界面下方维持缺氧，而通过螺旋桨搅拌驱动的突然性会增加几乎限制在导航区域。因此，加速降低物质和有机物质氧化的曝气效应主要是对表面沉积物中增强的酸积累的原因。此外，通过PH-MV图对零点的负偏移来识别悬浮效应。大多数测量点相应地散射在三个不同的回归线上，分别具有类似的斜率，但分别为pH 6.53,6.87和6.99的不同负偏移。他们的地理分布表明，这种效果与人为干扰强度具有正相关关系。虽然悬浮效应是由pH玻璃电极接口的带电粒子的吸附引起的（杨等，但在PART SCI Technol 7：139-152,1989）中，其在实践中观察到的各种强度也可能反映了沉积的固有区别物理化学条件下的环境。

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