Acidification of subsurface coastal waters enhanced by eutrophication
Acidification of subsurface coastal waters enhanced by eutrophication
复制标题
富营养化加剧了沿海地下水域的酸化
DOI：
10.1038/ngeo1297
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发表时间：
2011-11-01
影响因子：
18.3
通讯作者：
Gong, Gwo-Ching
中科院分区：
文献类型：
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作者：
Cai, Wei-Jun;Hu, Xinping;Gong, Gwo-Ching
人类向沿海沃茨输入营养物质会导致藻类的过度生产，这一过程被称为富营养化。微生物对这种有机物的消耗降低了水中的氧含量（1-3）。此外，微生物呼吸过程中产生的二氧化碳会增加酸度。大气中二氧化碳在海洋沃茨中的溶解也会提高酸度，这一过程被称为海洋酸化。在这里，我们评估了富营养化和海洋酸化对沿海海洋酸度的综合影响，使用的数据收集在北方墨西哥湾和中国东海的两个地区严重影响的营养负荷的河流。我们发现，在这些沃茨的富营养化与缺氧的发展和酸化的地下沃茨，如预期的。然而，利用从墨西哥湾北方收集的数据进行的模型模拟表明，自工业化前以来pH值的下降幅度大于仅由富营养化和海洋酸化引起的预期。我们将pH值额外下降0.05单位归因于这些富含二氧化碳的沃茨缓冲pH值变化的能力降低。我们认为富营养化可能会增加沿海沃茨对海洋酸化的敏感性。
Human inputs of nutrients to coastal waters can lead to the excessive production of algae, a process known as eutrophication. Microbial consumption of this organic matter lowers oxygen levels in the water(1-3). In addition, the carbon dioxide produced during microbial respiration increases acidity. The dissolution of atmospheric carbon dioxide in ocean waters also raises acidity, a process known as ocean acidification. Here, we assess the combined impact of eutrophication and ocean acidification on acidity in the coastal ocean, using data collected in the northern Gulf of Mexico and the East China Sea-two regions heavily influenced by nutrient-laden rivers. We show that eutrophication in these waters is associated with the development of hypoxia and the acidification of subsurface waters, as expected. Model simulations, using data collected from the northern Gulf of Mexico, however, suggest that the drop in pH since pre-industrial times is greater than that expected from eutrophication and ocean acidification alone. We attribute the additional drop in pH-of 0.05 units-to a reduction in the ability of these carbon dioxide-rich waters to buffer changes in pH. We suggest that eutrophication could increase the susceptibility of coastal waters to ocean acidification.