DOI: 10.1016/j.atmosenv.2020.117645
论文题名: Chemical characterization and sources of PM2.5 at a high-alpine ecosystem in the Southeast Tibetan Plateau, China
作者: Meng Y. ; Li R. ; Zhao Y. ; Cheng H. ; Fu H. ; Yan Z. ; Bing H.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 235 语种: 英语
英文关键词: Atmospheric chemistry
; Atmospheric movements
; Biochemistry
; Boundary layer flow
; Boundary layers
; Drought
; Ecosystems
; Factorization
; Fossil fuels
; Organic carbon
; Atmospheric dry deposition
; Average concentration
; Boundary layer heights
; Chemical characterization
; Chemical compositions
; Eastern Tibetan plateau
; Fossil fuel emissions
; Positive Matrix Factorization
; Trace elements
; alpine environment
; atmospheric transport
; chemical composition
; concentration (composition)
; elemental carbon
; organic carbon
; particulate matter
; toxicity
; trace element
; China
; Gongga Mountain
; Qinghai-Xizang Plateau
; Sichuan
学科: Alpine forest
; Bioavailability
; Carbonaceous composition
; Chemical composition
; PM2.5
; Tibetan plateau
; Trace elements
中文摘要: The study of atmospheric chemical compositions in remote areas is of great significance for understanding the biogeochemical impact of atmospheric dry deposition on ecosystems. In this study, a total of 50 p.m.2.5 samples were collected at a high alpine forest of Mt. Gongga, Eastern Tibetan Plateau from May 2015 to May 2016 to investigate the characteristics of PM2.5 mass concentration and its major compositions including elemental carbon (EC), organic carbon (OC), and 24 trace elements. The average PM2.5 mass concentration was 17.19 ± 8.81 μg/m3, which was at an intermediate level compared with other areas of Tibetan Plateau. The yearly average concentrations of OC and EC were 2.98 ± 1.95 and 0.43 ± 0.33 μg/m3, accounting for 19.49% and 2.51% of PM2.5 mass, respectively, and the sums of the total concentrations of the 24 analyzed trace elements were 3.70 ± 0.80 μg/m3, accounting 27% of PM2.5 mass concentration. PM2.5, EC and OC showed the higher concentrations and larger fluctuation in the dry season (October 2015 to May 2016) compared with those in the wet season (June 2015 to September 2015), which was attributed to the multiple factors including the increases of biomass burning and fossil fuel emissions, the relatively shallow boundary layer height and lower temperature, and the less precipitation. Two distinct seasonal patterns were observed for the 24 analyzed trace elements in PM2.5: the crustal-derived trace elements like Fe, Al, Mn and Sr showed the higher concentrations in the wet season, while anthropogenic-derived elements such as Cd, Pb, Ni and Zn exhibited the higher level during the dry season. Six sources were identified for PM2.5 at Mt. Gongga with the application of the positive matrix factorization (PMF). Biomass burning (27.06%) and crustal source (26.93%) were the two main sources, followed by secondary formation (16.41%), traffic-related source (12.89%), coal burning (10.57%) and industrial metallurgical process (6.15%). Finally, it was proposed that the atmospheric acidic processing could not only promote the dissolution of Fe, but also enhance the solubility of the other trace elements in the atmosphere during the transport. Accordingly, this would increase the bioavailability and/or toxicity to the biotic and plants. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160260
Appears in Collections: 气候变化与战略
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作者单位: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Institute of Atmospheric Science, Fudan University, Shanghai, 200433, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, 210044, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; Agilent Technologies (China) Co. Ltd., Shanghai, 200080, China; Alpine Ecosystem Observation and Experiment Station of Gongga Mountain, The Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China
Recommended Citation:
Meng Y.,Li R.,Zhao Y.,et al. Chemical characterization and sources of PM2.5 at a high-alpine ecosystem in the Southeast Tibetan Plateau, China[J]. Atmospheric Environment,2020-01-01,235