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首页> 外文期刊>Scientific reports. >The browning and re-browning of lakes: Divergent lake-water organic carbon trends linked to acid deposition and climate change
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The browning and re-browning of lakes: Divergent lake-water organic carbon trends linked to acid deposition and climate change

机译：湖泊的褐变和重褐色：与酸沉积和气候变化有关的发散湖水有机碳趋势

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Dissolved organic carbon (DOC) concentrations and water colour are increasing in many inland waters across northern Europe and northeastern North America. This inland-water "browning" has profound physical, chemical and biological repercussions for aquatic ecosystems affecting water quality, biological community structures and aquatic productivity. Potential drivers of this "browning" trend are complex and include reductions in atmospheric acid deposition, changes in land use/cover, increased nitrogen deposition and climate change. However, because of the overlapping impacts of these stressors, their relative contributions to DOC dynamics remain unclear, and without appropriate long-term monitoring data, it has not been possible to determine whether the ongoing "browning" is unprecedented or simply a "re-browning" to pre-industrial DOC levels. Here, we demonstrate the long-term impacts of acid deposition and climate change on lake-water DOC concentrations in low and high acid-deposition areas using infrared spectroscopic techniques on ~200-year-long lake-sediment records from central Canada. We show that acid deposition suppressed naturally higher DOC concentrations during the 20th century, but that a "re-browning" of lakes is now occurring with emissions reductions in formerly high deposition areas. In contrast, in low deposition areas, climate change is forcing lakes towards new ecological states, as lake-water DOC concentrations now often exceed pre-industrial levels.
机译：北欧北部和东北美国东北部的许多内陆水域溶解有机碳（DOC）浓度和水彩正在增加。这种内陆水“褐变”为影响水质，生物群落结构和水生成品的水生生态系统具有深厚的物理，化学和生物学影响。这种“褐变”趋势的潜在司机是复杂的，包括在大气酸沉积中减少，土地使用的变化/覆盖，增加的氮沉积和气候变化。然而，由于这些压力源的重叠影响，他们对DOC动态的相对贡献仍然不清楚，并且没有适当的长期监测数据，尚未确定正在进行的“褐变”是前所未有的还是简单的“重新褐变“到初步文档水平。在这里，我们证明了在加拿大中部〜200年长的湖泊沉积物记录上的红外光谱技术，酸沉积和气候变化对低酸沉积区域湖水DOC浓度的长期影响。我们表明，在20世纪，酸沉积抑制了自然更高的DOC浓度，但现在在以前高沉积区域中排放减排时，湖泊的“重新褐变”。相比之下，在低沉积地区，气候变化是迫使湖泊朝向新的生态状态，因为湖泊 - 水DOC浓度现在经常超过产业前水平。

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