College of Environmental Sciences and Engineering, China West Normal University, Nanchong 637009, China; Key Laboratory of Nanchong City of Ecological Environment Protection and Pollution Prevention in Jialing River Basin, China West Normal University, Nanchong 637009, China.
College of Environmental Sciences and Engineering, China West Normal University, Nanchong 637009, China.
J Environ Sci (China). 2025 Apr;150:277-287. doi: 10.1016/j.jes.2024.02.019. Epub 2024 Mar 18.
As an important component of secondary aerosols, sulfate plays a crucial role in regulating atmospheric radiative balance and influencing the secondary formation of ozone (O). In real atmosphere, atmospheric oxidants NO and O can promote the oxidation of SO to form sulfate (SO) through multiphase chemistry that occur at different time scales. Due to the combined impact of meteorology, pollution sources, atmospheric chemistry, etc., time-scale dependence of SO-SO conversion makes the impact of NO/O on it more complex. In this study, based on long-term time series (2013-2020) of air pollution variables from seven stations in Hong Kong, the Multifractal Detrended Cross-Correlation Analysis (MFDCCA) method has been employed to quantify the cross-correlations between SO and SO in real atmosphere at different time scales, for examining the time-scale dependence of SO-SO conversion efficiency. Furthermore, the Pearson correlation analysis has been used to study the influence of NO/O on SO-SO conversion, and the regional and seasonal differences have been analyzed by considering factors such as meteorology, pollution sources, and regional transport. Changes in the main components of secondary aerosols are closely linked with the co-control of regional PM and O. Therefore, the exploration of the impact of co-existing NO/O gases on the secondary formation of sulfates in real atmosphere is significant.
作为二次气溶胶的重要组成部分，硫酸盐在调节大气辐射平衡和影响臭氧（O）的二次形成方面起着至关重要的作用。在实际大气中，大气氧化剂 NO 和 O 可以通过在不同时间尺度上发生的多相化学作用促进 SO 的氧化，形成硫酸盐（SO）。由于气象、污染源、大气化学等因素的综合影响，SO-SO 转化的时间尺度依赖性使得 NO/O 对其的影响更加复杂。在本研究中，基于香港七个站点的空气污染变量的长期时间序列（2013-2020 年），采用多重分形去趋势交叉相关分析（MFDCCA）方法，量化了实际大气中不同时间尺度上 SO 和 SO 之间的交叉相关性，以检验 SO-SO 转化效率的时间尺度依赖性。此外，还采用 Pearson 相关分析研究了 NO/O 对 SO-SO 转化的影响，并通过考虑气象、污染源和区域输送等因素，分析了区域和季节性差异。二次气溶胶主要成分的变化与区域 PM 和 O 的协同控制密切相关。因此，探索共存的 NO/O 气体对实际大气中硫酸盐的二次形成的影响具有重要意义。
