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| 1 | Observations of atmospheric pollutants at Lhasa during 2014-2015:Pollution status and the influence of meteorological factors显示文摘Atmospheric pollutants including SO_2, NO_2, CO, O_3 and inhalable particulate matter(PM2.5 and PM10) were monitored continuously from March 2014 to February 2015 to investigate characteristics of air pollution at Lhasa, Tibetan Plateau. Species exhibited similar seasonal variations except O_3, with the peaks in winter but low valleys in summer. The maximum O_3 concentration was observed in spring, followed by summer, autumn, and winter. The positive correlation between O_3 and PM10 in spring indicated similar sources of them, and was assumed to be turbulent transport. Temperature was the dominant meteorological factor for most species in spring. High temperature accelerates O_3 photochemistry, and favors air disturbance which is conductive to dust resuspension in spring. Relative humidity(RH) and atmospheric pressure were the main meteorological factors in summer. RH showed negative correlations with species, while atmospheric pressure posed opposite situation. Wind speed(WS) was the dominant meteorological factor in autumn, the negative correlations between WS and species indicated diffusion by wind. Most species showed non-significant correlations with meteorological factors in winter, indicating the dependence of pollution on source emission rather than restriction by meteorology. Pollution weather character indicated that emissions were from biomass burning and dust suspension, and meteorological factors also played an important role. Air stream injection from the stratosphere was observed during O_3 pollution period. Air parcels from Southwest Asia were observed during air pollution period in winter. An enhancement in air pollutants such as O_3 would be expected in the future, more attention should be given to countermeasures for prevention of air pollution in the future. | Bu Duo Lulu Cui Zhenzhen Wang Rui Li Liwu Zhang Hongbo Fu Jianmin Chen Huifang Zhang A.Qiong | 2018 | Journal of Environmental Sciences2018，30，1： | 9 |
| 2 | Characteristics of size distributions and sources of water-soluble ions in Lhasa during monsoon and non-monsoon seasons显示文摘To understand the physical and chemical characteristics, particle size distribution and sources of size-separated aerosols in Lhasa, which is located on the Tibetan Plateau(TP), six sizes of aerosol samples were collected in Lhasa in 2014. Ca^(2+), NH_4^+, NO_3^-,SO_4^(2-)and Cl-were the dominant ions. The ratio of cation equivalents(CE) to anion equivalents(AE) for each particle size segment indicated that the atmospheric aerosols in Lhasa were alkaline. SO_4^(2-)and NO_3^-could be neutralized by Ca^(2+), but could not be neutralized by NH_4^+, according to the [NH_4^+]/[NO_3^-+ SO_4^(2-)] and [Ca^(2+)]/[NO_3^-+ SO_4^(2-)] ratios. Mobile sources were dominant in PM_(0.95-1.5),PM_(1.5-3) and PM_(3-7.2), while stationary sources were dominant in the other three size fractions according to the [NO_3^-]/[SO_4^(2-)] ratios. The particle size distribution of all watersoluble ions during monsoon and non-monsoon periods was characterized by a bimodal distribution due to the different sources and formation mechanisms, and it was revealed that different ions had different sources in different seasons and different particle size segments by combining particle size distribution with correlation analysis. Source analysis of aerosols in Lhasa was performed using the Principal component analysis(PCA) for the first time, which revealed that combustion sources, motor vehicle exhaust, photochemical reaction sources and various types of dust were the main sources of Lhasa aerosols.Furthermore, Lhasa's air quality was also affected by long-distance transmission, expressed as pollutants from South Asia and West Asia, which were transmitted to Lhasa according to backward trajectory analysis. | Nannan Wei Zhiyou Xu Junwen Liu Guanghua Wang Wei Liu Deqing Zhuoga Detao Xiao Jian Yao | 2019 | Journal of Environmental Sciences2019，31，8： | 7 |
| 3 | 大气单颗粒物理化特性研究进展显示文摘大气单颗粒物是大气气溶胶中的单个气溶胶颗粒,其理化特性是形成复杂多变大气气溶胶的物质基础。对大气单颗粒物的研究,在深入了解大气气溶胶理化特性的同时,进一步揭示了大气气溶胶的形成过程、化学反应机制和影响效应,对科学有效防控大气污染具有举足轻重的作用。从大气单颗粒物的研究内容、范围、技术方法、局限性等众多方面对国内外大气单颗粒物研究进展进行初步分析评估,探讨目前大气单颗粒物研究领域存在的问题与局限性。 | 陈均玉 崔小梅 任培 布多 | 2021 | 环境生态学2021，3，2： | 1 |
| 4 | 青藏高原阿里地区大气颗粒物质量浓度的季节变化特征显示文摘基于2018-12-01至2019-11-30在中国科学院阿里荒漠环境综合观测研究站颗粒物监测仪的数据,获得了大气颗粒物质量浓度及其季节变化特征.研究结果表明,PM10、PM_(2.5)、PM1在观测期间的日均质量浓度分别为(10.51±8.62)μg·m^(−3)、(4.05±2.36)μg·m^(−3)和(2.47±1.56)μg·m^(−3),低于青藏高原城市地区.PM_(2.5)、PM10远低于国家规定的颗粒物年平均一级浓度限值(GB 3095—2012),表明阿里地区洁净的大气本底特征.阿里地区污染源稀少,气象因子成为影响颗粒物浓度变化的重要因素.尽管阿里地处西风和印度季风的过渡带,西南季风显著影响了阿里站颗粒物浓度变化,季风带来的暖湿气团使季风期颗粒物浓度显著降低;加之边界层高度等气象因素的季节变化,使大气颗粒物浓度呈现明显的季节变化规律,冬季和季风前大于季风期和季风后期.阿里站处于高寒荒漠环境,大气颗粒物以粗颗粒为主,PM_(2.5)/PM10的平均比值为0.39,与其他地点对比,比值偏低.聚类分析表明,阿里站主要受偏西气团影响.潜在源贡献因子分析(PSCF)和浓度权重轨迹分析(CWT)分析结果表明,PM10、PM_(2.5)、PM1主要潜在源区均分布在印度西北部、巴基斯坦北部.由于监测原理的不同和气象因子的影响,MODIS AOD数据与颗粒物浓度数据在12月、7月和8月差异较大,遥感获取的气溶胶参数需要进一步订正提高在高原的适用性. | 谢会晴 邬光剑 曹泊 于正良 石洪发 张宇轩 黄菊 | 2023 | 环境化学2023，42，4： | 0 |
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