College of Geography and Environment, Shandong Normal University, Jinan 250014, China.
College of Geography and Environment, Shandong Normal University, Jinan 250014, China.
J Environ Sci (China). 2023 Mar;125:524-532. doi: 10.1016/j.jes.2022.02.042. Epub 2022 Mar 5.
The study of atmospheric polycyclic aromatic hydrocarbons (PAHs) in northeastern Tibetan Plateau with fragile ecological environment and complex atmospheric circulation system is blank. To understand the characteristics and sources of persistent organic pollutants in the atmosphere of the northeastern Tibetan Plateau, we monitored levels in the central Qilian Mountain. From 2016 to 2017, we collected 45-pair (particle + gas) samples using active air samplers to investigate the sources, transport paths, and their influencing factors. Sources of PAHs were analysed with a source diagnostic model, and atmospheric transport paths were calculated. The concentration range for ∑PAHs was 439-4666 pg/m, and the average was 2015 pg/m. The PAHs in central Qilian Mountain are mainly low molecular weight (LMW) PAHs. Winter concentrations of PAHs were higher than those in summer. The transport of PAHs is mainly affected by westerlies, and there are seasonal differences. Source analysis showed that PAHs mainly came from coal and biomass combustion and vehicle emissions, with seasonal differences. This study clarifies the concentration and seasonal variation of PAHs in the northern Tibetan Plateau, which is conducive to understanding the atmospheric transport process and fate of pollutants. The background site of Qilian Mountains located in the Silk Road economic belt has the value and significance of long-term observation of pollutants.
该研究对青藏高原东北部大气多环芳烃（PAHs）进行了研究，该地区生态环境脆弱，大气环流系统复杂。为了了解青藏高原东北部大气中持久性有机污染物的特征和来源，我们监测了祁连山中段的水平。2016 年至 2017 年，我们使用主动空气采样器采集了 45 对（颗粒+气体）样本，以调查来源、传输路径及其影响因素。利用源诊断模型分析了 PAHs 的来源，并计算了大气传输路径。∑PAHs 的浓度范围为 439-4666 pg/m，平均值为 2015 pg/m。祁连山中段的 PAHs 主要为低分子量（LMW）PAHs。冬季 PAHs 的浓度高于夏季。PAHs 的传输主要受西风影响，存在季节性差异。源分析表明，PAHs 主要来自煤炭和生物质燃烧以及汽车排放，具有季节性差异。本研究阐明了青藏高原北部 PAHs 的浓度和季节性变化，有助于了解污染物的大气传输过程和归宿。祁连山作为丝绸之路经济带的背景站点，具有长期观测污染物的价值和意义。
