大气科学2026，Vol.50Issue(2)：451-462,12.DOI:10.3878/j.issn.1006-9895.2505.24106
青藏高原西部大气颗粒物污染特征及来源分析
Analysis of the Pollution Characteristics and Sources of Atmospheric Particulate Matter in the Western Qinghai-Xizang Plateau
摘要
Abstract
The study of atmospheric particulate matter pollution characteristics and sources over Qinghai-Xizang Plateau is of considerable scientific importance for ecological environmental protection and climate change impact assessment in this region.Using observational data from the Second Qinghai-Xizang Plateau Scientific Expedition and Research Program collected in Ali during July-August 2019,surface observations from the Shiquanhe National Climate Station,and meteorological fields from the Global Data Assimilation System(GDAS1),this study investigated the characteristics,source regions,and contributions of atmospheric particulate matter in the western Qinghai-Xizang Plateau during summer.The source-resolved PMF(positive matrix factorization)model,backward trajectory cluster analysis,and CWT(concentration-weighted trajectory)analysis were employed.Results show that TSP(total suspended particulates)in the Ali region mainly consist of mineral dust(48.7%),organic matter(37.6%),nondust water-soluble inorganic ions(12.7%),and elemental carbon(0.9%).The concentrations of metal elements in sand and dust were positively correlated with wind speed.Elevated potassium concentrations and high organic carbon to elemental carbon ratios(OC/EC)suggest that biomass burning exerts a stronger influence than fossil fuel combustion in the western plateau.PMF results identified four main pollution sources:mineral dust(38%),secondary formation(28%),biomass burning(27%),and fossil fuel combustion(7%).Overall,natural dust emissions and anthropogenic organic aerosols from biomass burning are the dominant contributors to particulate matter in the western Qinghai-Xizang Plateau.Backward trajectory distance clustering and CWT analysis indicate that external pollutants are mainly transported over short distances from South Asia,with particularly significant influence from northwestern India.In particular,anthropogenic aerosols—including organic carbon,elemental carbon,sulfate,and biomass burning emissions—from India substantially affect particulate matter concentrations in the region.In contrast,local dust is primarily generated by strong surface winds,with additional contributions from northwestern India and minor influence from the Taklamakan Desert.关键词
青藏高原/颗粒物/分布特征/源解析Key words
Qinghai-Xizang Plateau/Particulate matter/Distribution characteristics/Source resolution分类
天文与地球科学引用本文复制引用
周新强,张镭,陈兵,罗涛,吴雪,王伟懿..青藏高原西部大气颗粒物污染特征及来源分析[J].大气科学,2026,50(2):451-462,12.基金项目
云南省基础研究重点项目202501AS070065,国家自然科学基金项目42175046、42065009,科技部第二次青藏高原综合科学考察研究任务六专题2——粉尘气溶胶及其气候环境效应项目2019QZKK0602 Key Basic Research Project of Yunnan Province(Grant 202501AS070065),National Natural Science Foundation of China(Grants 42175046,42065009),The Second Tibetan Plateau Scientific Expedition Conducted by the Ministry of Science and Technology,Task Six,Topic 2:Dust Aerosols and Their Climatic and Environmental Effects(Grant 2019QZKK0602) （Grant 202501AS070065）
