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Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry

机译：大气沉积化学变化导致溶解的有机碳趋势

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Several hypotheses have been proposed to explain recent, widespread increases in concentrations of dissolved organic carbon (DOC) in the surface waters of glaciated landscapes across eastern North America and northern and central Europe. Some invoke anthropogenic forcing through mechanisms related to climate change, nitrogen deposition or changes in land use, and by implication suggest that current concentrations and fluxes are without precedent. All of these hypotheses imply that DOC levels will continue to rise, with unpredictable consequences for the global carbon cycle. Alternatively, it has been proposed that DOC concentrations are returning toward pre-industrial levels as a result of a gradual decline in the sulphate content of atmospheric deposition. Here we show, through the assessment of time series data from 522 remote lakes and streams in North America and northern Europe, that rising trends in DOC between 1990 and 2004 can be concisely explained by a simple model based solely on changes in deposition chemistry and catchment acid-sensitivity. We demonstrate that DOC concentrations have increased in proportion to the rates at which atmospherically deposited anthropogenic sulphur and sea salt have declined. We conclude that acid deposition to these ecosystems has been partially buffered by changes in organic acidity and that the rise in DOC is integral to recovery from acidification. Over recent decades, deposition-driven increases in organic matter solubility may have increased the export of DOC to the oceans, a potentially important component of regional carbon balances. The increase in DOC concentrations in these regions appears unrelated to other climatic factors.
机译：已经提出了几种假说来解释近期北美东部以及北欧和中欧冰川景观地表水中溶解有机碳（DOC）浓度的普遍增加。有些人通过与气候变化，氮沉降或土地利用变化有关的机制来调用人为强迫，并暗示目前的浓度和通量没有先例。所有这些假设都表明DOC含量将继续上升，对全球碳循环产生不可预测的后果。另外，由于大气沉积物中硫酸盐含量的逐渐下降，已提出DOC浓度正返回工业化前的水平。在这里，我们显示，通过评估北美和北欧的522个偏远湖泊和溪流的时间序列数据，可以通过仅基于沉积化学和集水变化的简单模型来简明地解释1990年至2004年之间DOC的上升趋势。酸敏感性。我们证明，DOC浓度与大气沉积人为硫和海盐下降的速率成比例地增加。我们得出的结论是，有机酸度的变化已部分缓冲了向这些生态系统的酸沉降，DOC的增加对于酸化的恢复是不可或缺的。在最近的几十年中，由沉积驱动的有机物溶解度的增加可能增加了DOC向海洋的出口，这是区域碳平衡的潜在重要组成部分。这些地区的DOC浓度增加似乎与其他气候因素无关。

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