Source identification of volatile organic compounds precursors from glyoxal and secondary formaldehyde utilizing MAX-DOAS observations in guangzhou, China - Jincheng Xing; Qianqian Hong; Baixue Yang; Chengzhi Xing; Shijian Yang; Mao Mao; Wenjing Su; Yujia Chen; Chengxin Zhang (Atmospheric Research, 2025)