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11. Corrigendum to “Carbonaceous matter in the atmosphere and glaciers of the Himalayas and the Tibetan plateau: An investigative review” [Environ. Int. 146 (2021) 106281]

Author

Li, Chaoliu, primary, Yan, Fangping, additional, Kang, Shichang, additional, Yan, Caiqing, additional, Hu, Zhaofu, additional, Chen, Pengfei, additional, Gao, Shaopeng, additional, Zhang, Chao, additional, He, Cenlin, additional, Kaspari, Susan, additional, and Stubbins, Aron, additional

Published
2023
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21. Black carbon and organic carbon dataset over the Third Pole

Author

Kang, Shichang, primary, Zhang, Yulan, additional, Chen, Pengfei, additional, Guo, Junming, additional, Zhang, Qianggong, additional, Cong, Zhiyuan, additional, Kaspari, Susan, additional, Tripathee, Lekhendra, additional, Gao, Tanguang, additional, Niu, Hewen, additional, Zhong, Xinyue, additional, Chen, Xintong, additional, Hu, Zhaofu, additional, Li, Xiaofei, additional, Li, Yang, additional, Neupane, Bigyan, additional, Yan, Fangping, additional, Rupakheti, Dipesh, additional, Gul, Chaman, additional, Zhang, Wei, additional, Wu, Guangming, additional, Yang, Ling, additional, Wang, Zhaoqing, additional, and Li, Chaoliu, additional

Published
2022
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22. Corrigendum to ‘Light absorption and fluorescence characteristics of water-soluble organic compounds in carbonaceous particles at a typical remote site in the southeastern Himalayas and Tibetan Plateau’ [Vol. 272, 1 March 2021, 116000]

Author

Zhang, Chao, primary, Chen, Meilian, additional, Kang, Shichang, additional, Yan, Fangping, additional, Han, Xiaowen, additional, Gautam, Sangita, additional, Hu, Zhaofu, additional, Zheng, Huijun, additional, Chen, Pengfei, additional, Gao, Shaopeng, additional, Wang, Pengling, additional, and Li, Chaoliu, additional

Published
2022
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25. Light absorption and fluorescence characteristics of water-soluble organic compounds in carbonaceous particles at a typical remote site in the southeastern Himalayas and Tibetan Plateau

Author

Zhang, Chao, primary, Chen, Meilian, additional, Kang, Shichang, additional, Yan, Fangping, additional, Han, Xiaowen, additional, Gautam, Sangita, additional, Hu, Zhaofu, additional, Zheng, Huijun, additional, Chen, Pengfei, additional, Gao, Shaopeng, additional, Wang, Pengling, additional, and Li, Chaoliu, additional

Published
2021
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30. Deposition of Organic and Black Carbon: Direct Measurements at Three Remote Stations in the Himalayas and Tibetan Plateau

Author

Yan, Fangping, He, Cenlin, Kang, Shichang, Chen, Pengfei, Hu, Zhaofu, Han, Xiaowen, Gautam, Sangita, Yan, Caiqing, Zheng, Mei, Sillanpää, Mika, Raymond, Peter, Li, Chaoliu, Lappeenrannan-Lahden teknillinen yliopisto LUT, Lappeenranta-Lahti University of Technology LUT, and fi=School of Engineering Science|en=School of Engineering Science

Abstract

Carbonaceous matter in the atmosphere has an important influence on climate change. Currently, the deposition of carbonaceous matter is one of the largest uncertainties in the climate system. This phenomenon is common in remote regions, such as the Himalayas and Tibetan Plateau. In this study, for the first time, we reported in situ measurements of wet and dry deposition rates of carbonaceous matter at three remote stations: Nam Co, Lulang, and Everest. The results showed that the annual wet deposition rates of water‐insoluble organic carbon (WIOC) and black carbon (BC) were 60.2 and 5.8 mg·m−2·year−1, 330 and 34.6 mg·m−2·year−1, and 47.0 and 2.6 mg·m−2·year−1 at the Nam Co, Lulang, and Everest stations, respectively. Seasonal variations in the wet deposition rates of WIOC and BC were controlled by precipitation amount and their atmospheric concentrations. In addition, the wet scavenging ratios of WIOC and BC at Nam Co Station were close to those observed in other remote areas. The total BC deposition at Nam Co Station (15.3 mg·m−2·year−1) was higher than that from chemical transport models, implying a dominant role of dry deposition of BC in the total deposition at this station and an urgent need to improve the aerosol deposition in models for the Himalayas and Tibetan Plateau. It was found that the deposition rates of carbonaceous matter in the Himalayas and Tibetan Plateau had large spatial variation; thus, high‐resolution models need to be applied in the future. Post-print / Final draft

Published
2019

31. Release of Perfluoroalkyl Substances From Melting Glacier of the Tibetan Plateau: Insights Into the Impact of Global Warming on the Cycling of Emerging Pollutants

Author

Chen, Mengke, Wang, Chuanfei, Wang, Xiaoping, Fu, Jianjie, Gong, Ping, Yan, Juping, Yu, Zhengliang, Yan, Fangping, Nawab, Javed, Lappeenrannan-Lahden teknillinen yliopisto LUT, Lappeenranta-Lahti University of Technology LUT, and fi=School of Engineering Science|en=School of Engineering Science

Abstract

The Tibetan Plateau (TP) has encountered rapid warming, with more than 50% of lakes expanding and 80% of glaciers retreating. Melting glaciers are known as a secondary source of pollutants, but the dynamics and release features of water‐soluble emerging chemicals have not been studied in the TP. Glacial ice and snow, meltwater runoff, rain, and lake water were collected in Nam Co basin, in the central TP. The total concentrations of perfluoroalkyl acids (PFAAs) were 1,413 pg/L for glacial ice, followed by 1,277 pg/L for meltwater runoff, 980 pg/L for lake water, and 616 pg/L for rain. Perfluorobutanoic acid is dominant in runoff and glacial ice, while lake water contained high proportions of perfluorobutane sulfonate and perfluorooctane sulfonate. During the melting season, meltwater runoff generally had greater PFAAs concentrations, and the PFAAs release fluxes were strongly related to the glacial melt intensity. Due to the direct input of PFAAs by melted glaciers, south shore of Lake Nam Co contained higher PFAAs concentrations. The estimated input fluxes of PFAAs to the lake by rain and glacial and nonglacial runoff were 1,425, 1,342, and 2,192 mg/day, respectively. Taken together, these evidences suggest that melting glaciers are sources of PFAAs, while the lake is the receptor. Given the continuity of glacial melt and high concentrations of water‐soluble emerging pollutants in glacier, the melting process will increase the risks of emerging pollutants to freshwater sources and should be of great concern. Post-print / Final draft

Published
2019

33. Heavy near-surface PM2.5 pollution in Lhasa, China during a relatively static winter period

Author

Li, Chaoliu, primary, Han, Xiaowen, additional, Kang, Shichang, additional, Yan, Fangping, additional, Chen, Pengfei, additional, Hu, Zhaofu, additional, Yang, Junhua, additional, Ciren, Duojie, additional, Gao, Shaopeng, additional, Sillanpää, Mika, additional, Han, Yongming, additional, Cui, Yuyan, additional, Liu, Shang, additional, and Smith, Kirk R., additional

Published
2019
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34. Light-absorbing impurities in a southern Tibetan Plateau glacier: Variations and potential impact on snow albedo and radiative forcing

Author

Li, Xiaofei, primary, Kang, Shichang, additional, Zhang, Guoshuai, additional, Qu, Bin, additional, Tripathee, Lekhendra, additional, Paudyal, Rukumesh, additional, Jing, Zhefan, additional, Zhang, Yulan, additional, Yan, Fangping, additional, Li, Gang, additional, Cui, Xiaoqing, additional, Xu, Rui, additional, Hu, Zhaofu, additional, and Li, Chaoliu, additional

Published
2018
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37. Re-evaluating black carbon in the Himalayas and the Tibetan Plateau: concentrations and deposition

Author

Li, Chaoliu, primary, Yan, Fangping, additional, Kang, Shichang, additional, Chen, Pengfei, additional, Han, Xiaowen, additional, Hu, Zhaofu, additional, Zhang, Guoshuai, additional, Hong, Ye, additional, Gao, Shaopeng, additional, Qu, Bin, additional, Zhu, Zhejing, additional, Li, Jiwei, additional, Chen, Bing, additional, and Sillanpää, Mika, additional

Published
2017
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41. Characteristics of Particulate-Phase Polycyclic Aromatic Hydrocarbons (PAHs) in the Atmosphere over the Central Himalayas

Author

Chen, Pengfei, primary, Li, Chaoliu, additional, Kang, Shichang, additional, Rupakheti, Maheswar, additional, Panday, Arnico K., additional, Yan, Fangping, additional, Li, Quanlian, additional, Zhang, Qianggong, additional, Guo, Junming, additional, Ji, Zhenming, additional, Rupakheti, Dipesh, additional, and Luo, Wei, additional

Published
2017
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42. Source apportionment of particle-bound polycyclic aromatic hydrocarbons in Lumbini, Nepal by using the positive matrix factorization receptor model

Author

Chen, Pengfei, primary, Li, Chaoliu, additional, Kang, Shichang, additional, Yan, Fangping, additional, Zhang, Qianggong, additional, Ji, Zhengming, additional, Tripathee, Lekhendra, additional, Rupakheti, Dipesh, additional, Rupakheti, Maheswar, additional, Qu, Bin, additional, and Sillanpää, Mika, additional

Published
2016
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44. Effect of Cone-Plate Clarifier Structure Parameters on Flocculation Efficiency.

Author

Zhang, Yulong, Liu, Peikun, Xiao, Linjing, Chang, Long, Yan, Fangping, and Jiang, Lanyue

Subjects
COAL mining, FLOCCULATION, POLYACRYLAMIDE, POLYALUMINUM chloride, TURBIDITY
Abstract

In this study, a coal mine water flocculation system was established. A series of flocculation tests were carried out at different structural parameters (cylinder height, cone-plate insertion depth and cone-plate spacing) to better investigate the effect of the cone-plate clarifier on coal mine water treatment performance. Sixteen sampling points were set up in the system for data monitoring to generate the required data. The cone-plate clarifier was divided into five zones for flocculation analysis. The increased cylinder height facilitated the flocculation of particles in the micro flocculation zone and the settling of particles in the settlement zone. The chemicals used are polyaluminum chloride (PACl), Fe3O4 and polyacrylamide (PAM), corresponding to doses of 60 mg/L, 40 mg/L and 6 mg/L, respectively. Insufficient insertion depth of the cone-plate will cause the small flocs that have not been fully flocculated to enter the exit pipe zone directly through the cone-plate, while too much insertion depth will cause the large floc in the settlement zone to re-enter the exit pipe zone. The flocculation effect of small flocs increased as the cone-plate spacing decreased, which is consistent with the shallow pool theory. When the cone plate spacing was too narrow, the amount of fluid was reduced and the increase in fluid velocity reduced the flocculation effect. Curve fitting was conducted for Suspended solids(SS) and turbidity removal efficiency under each structural parameter to derive the variation of SS and turbidity removal efficiency under different structural parameters. The regression models of SS and turbidity removal efficiency on the cylinder height, cone-plate insertion depth and cone-plate spacing were established based on the curve fitting results, and the regression models were verified to be well fitted based on the comparison of experimental results. Finally, the optimal values of SS and turbidity removal efficiency were found based on the regression model. The flow rate of the cone-plate clarifier is 0.6 m3/h. The SS removal efficiency reached 96.82% when the cylinder height was 708 mm, the cone-plate insertion depth was 367 mm and the cone-plate spacing was 26 mm. The turbidity removal efficiency reached 86.75% when the cylinder height was 709 mm, the cone-plate insertion depth was 369 mm and the cone-plate spacing was 26 mm. [ABSTRACT FROM AUTHOR]

Published
2022
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45. Importance of local non-fossil sources to carbonaceous aerosols at the eastern fringe of the Tibetan Plateau, China: Δ 14 C and δ 13 C evidences.

Author

Li C, Zhang C, Yan F, Kang S, Xu Y, Liu Y, Gao Y, Chen P, and He C

Subjects
Aerosols analysis, Carbon analysis, China, Environmental Monitoring, Seasons, Tibet, Air Pollutants analysis, Particulate Matter analysis
Abstract

Carbonaceous particles are an important radiative forcing agent in the atmosphere, with large temporal and spatial variations in their concentrations and compositions, especially in remote regions. This study reported the Δ 14 C and δ 13 C of total carbon (TC) and water-insoluble particulate carbon (IPC) of the total suspended particles (TSP) and PM 2.5 at a remote site of the eastern Tibetan Plateau (TP), a region that is influenced by heavy air pollution from Southwest China. The average organic carbon and elemental carbon concentrations of TSP samples in this study were 3.20 ± 2.38 μg m -3 and 0.68 ± 0.67 μg m -3 , respectively, with low and high values in summer and winter, respectively. The fossil fuel contributions of TC in TSP and PM 2.5 samples were 18.91 ± 7.22% and 23.13 ± 12.52%, respectively, both of which were far lower than that in Southwest China, indicating the importance of non-fossil contributions from local sources. The δ 13 C of TC in TSP samples of the study site was -27.06 ± 0.96‰, which is between the values of long-range transported sources (e.g., Southwest China) and local biomass combustion emissions. Therefore, despite the contribution from the long-range transport of particles, aerosols emitted from local biomass combustion also have an important influence on carbonaceous particles at the study site. The findings of this work can be applied to other remote sites on the eastern TP and should be considered in related research in the future., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Published
2022
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46. Heavy near-surface PM 2.5 pollution in Lhasa, China during a relatively static winter period.

Author

Li C, Han X, Kang S, Yan F, Chen P, Hu Z, Yang J, Ciren D, Gao S, Sillanpää M, Han Y, Cui Y, Liu S, and Smith KR

Subjects
Air Pollutants analysis, China, Cities, Cooking, Environmental Monitoring, Heating, Air Pollution analysis, Environmental Pollution prevention & control, Particulate Matter analysis, Seasons
Abstract

Fairly high near-surface PM 2.5 concentrations were found during relatively static winter conditions within Lhasa - a Tibetan Plateau city normally considered to have a clean atmosphere. The average daily PM 2.5 concentration reached 118 ± 60 μg m -3 during the study period, was approximately 3.4 times the United States Environmental Protection Agency 24-h standard. PM 2.5 concentration of Lhasa increased from 20:00 until 23:00, which was probably caused by space heating, waste incineration activities and decreased boundary layer at night. Furthermore, we found traditional religious butter lamp lighting of local Tibetan residents during festivals could cause PM 2.5 concentration to reach an alarmingly high level, 240 ± 30 μg m -3 . Therefore, to protect the atmosphere of Lhasa, the government may wish to conduct more complete monitoring and find ways to encourage clean heating and cooking fuels, enforce the supervision on illegal emission activities such as waste incineration, and guide residents to transfer to more environmentally friendly activities during festivals., (Copyright © 2018 Elsevier Ltd. All rights reserved.)

Published
2019
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