Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China; School of Geography Science, Nanjing Normal University, Nanjing 210023, China.
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China; School of Geography Science, Nanjing Normal University, Nanjing 210023, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210023, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China.
J Hazard Mater. 2022 Aug 15;436:129209. doi: 10.1016/j.jhazmat.2022.129209. Epub 2022 May 21.
Black carbon (BC) is a retarder in carbon cycle, and the proportion of char and soot in BC restricts the significance of BC as a sink in carbon cycle. Tracing the sources of char and soot is helpful for in-depth understanding the anthropogenic-driven burial and pattern of BC, and is crucial for regulating emissions of BC and impact of BC on carbon cycle/climate change. This study investigated source-driven BC via the concentration and δC of BC (char and soot) in a Plateau lake sediment. The burial rate of BC (mean: 6.42 ± 5.09 g m yr) showed an increasing trend (3.7 times after 1977 compared with before), and the growth rate of char (4.1 times) was faster than soot (2.5 times). The source trace results, showing faster growth of coal combustion ratio in char (increased 21% after 1980 compared with before) than soot (13%), proved that coal combustion promoted faster growth of char in BC. Redundancy analysis confirmed that more low-temperature utilization of coal urged a stronger driving force for char than soot, which caused BC to have lower aromatic content and higher reactivity in organic carbon pool from the past to present, further impact the effects of BC on carbon cycle.
黑碳（BC）是碳循环的抑制剂，而炭和烟灰在 BC 中的比例限制了其作为碳汇的重要性。追踪炭和烟灰的来源有助于深入了解人为驱动的 BC 埋藏和模式，对于调节 BC 的排放以及 BC 对碳循环/气候变化的影响至关重要。本研究通过高原湖泊沉积物中 BC（炭和烟灰）的浓度和 δC 来研究源驱动的 BC。BC 的埋藏率（平均值：6.42±5.09 g m yr）呈上升趋势（1977 年后是之前的 3.7 倍），炭的增长率（4.1 倍）快于烟灰（2.5 倍）。来源追踪结果表明，与烟灰（1980 年后比之前增加 13%）相比，煤炭燃烧在炭中的比例增长更快（增加 21%），证明煤炭燃烧促进了 BC 中炭的更快增长。冗余分析证实，更多的煤炭低温利用促使炭比烟灰具有更强的驱动力，这导致 BC 在过去到现在的有机碳库中具有更低的芳香族含量和更高的反应性，进一步影响了 BC 对碳循环的影响。
