作者：Nie, Y., Liu, T., Wang, Q., Yu, C., Liu, H., Dou, J., Yin, J., Xie, Y., Zhu, C., Zou, Z., Jiang, Y., Chi, X., Qi, X., Liu, Y., Nie, W., Zha, Q., Wang, J., Zhou, M., Qin, W. Ding, A.

Eutrophic lakes, often enriched with various algae, can emit large amounts of volatile organic compounds into the atmosphere, which may serve as potential secondary organic aerosol (SOA) precursors. However, their contributions to SOA formation remain poorly understood. We herein conducted a real-time measurement of SOA formation from ambient air in the Taihu Lake-adjacent area in China during the summertime using an Oxidation Flow Reactor (OFR). The results showed that SOA formation in the OFR peaked at 2.62 +/- 5.09 mu g m-3 during daytime and 6.52 +/- 8.02 mu g m-3 during nighttime under equivalent photochemical ages of 2 and 3.3 days, respectively. Known precursors explained 23.8%-30.5% of the measured SOA, suggesting the importance of unidentified precursors in the Taihu Lake-adjacent area. Furthermore, by combining the positive matrix factorization and multilinear regression, we found that algal emissions contributed 17.7% and 6.4% to the potential SOA during daytime and nighttime. Heatwaves further enhanced the contribution of algal emissions to SOA, which can exceed 30% for temperatures over 35 degrees C. To the best of our knowledge, this is the first time that the contribution of algal emissions to SOA formation near a eutrophic lake was quantified. These findings highlight the critical role of algal emissions in SOA formation in adjacent areas of aquatic ecosystems.

富营养化湖泊通常富含各类藻类，可向大气排放大量挥发性有机物（VOCs），这些物质可能是潜在的二气溶胶（SOA）前体物，但其对SOA生成的贡献仍知之甚少。研究利用氧化流管反应器（Oxidation Flow Reactor, OFR），在夏季对中国太湖邻近地区的环境大气中SOA生成进行了实时测量。结果表明：在等效光化学龄分别为2天与3.3天时，OFR中SOA生成量峰值白天为2.62 ± 5.09 μg·m⁻³，夜间为6.52 ± 8.02 μg·m⁻³。已知前体物仅能解释实测SOA的23.8%—30.5%，表明太湖邻近地区存在重要的未知前体物。进一步结合正定矩阵因子分解（PMF）与多元线性回归，发现藻源排放在白天和夜间分别贡献了潜势SOA的17.7%与6.4%。热浪进一步增强藻源排放对SOA的贡献——当气温超过35 °C时，其贡献可超过30%。这是首次对富营养化湖泊周边藻源排放对SOA生成贡献的定量评估。这些发现凸显了藻源排放在水生生态系统邻近地区SOA生成中的关键作用。

（来源：Environmental Science & Technology 2026 Issue 19  DOI: 10.1021/acs.est.5c17758）