Significant influence of nitrate on light absorption enhancement of refractory black carbon in the winter of 2022 in Beijing - Hu, Xinyao; Liu, Quan; Zhang, Yangmei; Shen, Xiaojing; Lu, Jiayuan; Yu, Aoyuan; Liu, Shuo; Che, Huizheng; Zhang, Xiaoye; Sun, Junying (Atmospheric environment (1994), 2024)