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Start Over Author "Fu, Qingyan" Journal chemosphere
7 results on '"Fu, Qingyan"'

6. Vertical profiles of particle light extinction coefficient in the lower troposphere in Shanghai in winter based on tethered airship measurements

Author

Juntao Huo, Fu Qingyan, Yele Sun, Qingqing Wang, Dongfang Wang, Yang Yong, Guangli Xiu, and Dongnian Fei

Subjects
Daytime, China, Environmental Engineering, Haze, Health, Toxicology and Mutagenesis, 0208 environmental biotechnology, 02 engineering and technology, Wind, 010501 environmental sciences, Atmospheric sciences, 01 natural sciences, Atmosphere, Troposphere, Environmental Chemistry, Relative humidity, 0105 earth and related environmental sciences, Pollutant, Aerosols, Air Pollutants, Single-scattering albedo, Public Health, Environmental and Occupational Health, General Medicine, General Chemistry, Pollution, 020801 environmental engineering, Boundary layer, Environmental science, Particulate Matter, Seasons, Environmental Monitoring
Abstract

A cavity attenuated phase shift single scattering albedo monitor was set up on a tethered airship platform to study the vertical profiles of particle light extinction coefficient (bext) in the lower troposphere ( 75 μg m−3) were observed below 1000 m. The vertical differences of bext were highly dynamic as the vertical variation in bext was significant by as much as 605 Mm−1. The TH was observed mostly at about 100–200 m, and 450–650 m during night and daytime, respectively, and was in a wide range of ∼50–900 m during 15:00–22:00 due to the low boundary layer and/or the transport of pollutants. In particular, the TH was consistently below 500 m throughout the day during highly polluted haze episodes, highlighting the important role of a stagnant atmosphere situation for high concentrations of PM2.5. The vertical distribution of bext did not have a constant rule with respect to relative humidity and wind. Sometimes, peak values of bext at ∼350 m and 500 m during daytime were caused by enhanced regional transport. During stagnant and highly polluted situations or well-mixed clean days, bext was usually uniformly distributed below and above the TH, respectively, although bext was much smaller above the TH. For other situations, local emissions, pollutant transport, and the physical and chemical characteristics of aerosols resulted in highly dynamic vertical profiles of bext.

Published
2019

7. ROS-generation potential of Humic-like substances (HULIS) in ambient PM 2.5 in urban Shanghai: Association with HULIS concentration and light absorbance.

Author

Xu X, Lu X, Li X, Liu Y, Wang X, Chen H, Chen J, Yang X, Fu TM, Zhao Q, and Fu Q

Subjects
Aerosols analysis, China, Environmental Monitoring, Seasons, Water chemistry, Air Pollutants analysis, Humic Substances analysis, Particulate Matter analysis, Reactive Oxygen Species chemistry
Abstract

Ambient fine particulate matter (PM 2.5 ) can cause adverse health effects through the generation of reactive oxygen species (ROS) after inhalation. Humic-like substances (HULIS) are major constituents contributing to the ROS-generation potential in organic aerosols. In this study, PM 2.5 samples in urban Shanghai during autumn and winter (2018-2019) were collected. Mass-normalized ·OH generation rate in surrogate lung fluid (SLF) was used to denote the intrinsic ROS-generation potential of PM 2.5 or of the HULIS isolated from PM 2.5 . In this study, ROS-generation potential of PM 2.5 decreased with increasing ambient PM 2.5 concentration due to higher percentage of inorganic components in high PM 2.5 event. Same trend was observed for the ROS-generation potential of unit mass of HULIS, which was higher when HULIS and PM 2.5 concentrations were both relatively lower. The HULIS with high ROS-generation potential but low concentration (High-ROS/Low-Conc HULIS) were likely produced by the atmospheric aqueous-phase reactions during nighttime or under high relative humidity conditions, not from biomass burning emissions or the photochemical pollution products. The association between ROS-generation potential and light absorption properties of HULIS was studied as well. The High-ROS/Low-Conc HULIS also showed stronger light absorbance than the other HULIS. Our results implied the potentially important roles that HULIS species might play in atmospheric environment and human health even when the PM 2.5 pollution is low., 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 © 2020 Elsevier Ltd. All rights reserved.)

Published
2020
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