Seasonal variation and sources of atmospheric polycyclic aromatic hydrocarbons in a background site on the Tibetan Plateau  

作　　者：Xuemei Wu Weijun Sun Baojuan Huai LeiWang Chuntan Han Yetang Wang Wenying Mi 

机构地区：[1]College of Geography and Environment,Shandong Normal University,Jinan 250014,China [2]Qilian Alpine Ecology and Hydrology Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]MINJIE Institute of Environmental Science and Health Research,Geesthacht 21502,Germany

出　　处：《Journal of Environmental Sciences》2023年第3期524-532,共9页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of China (No. 41971073);the Second Tibetan Plateau Scientific Expedition and Research (STEP) program (No. 2019QZKK0106)。

摘　　要：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 Σ15PAHs was 439–4666 pg/m^(3), and the average was 2015 pg/m^(3). 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 longterm observation of pollutants.

关 键 词：Long-range atmospheric transport Seasonal variation concentration Meteorological factors Qilian Mountain 

分 类 号：X51[环境科学与工程—环境工程]