« Previous Abstract"Male-Produced Aggregation Pheromone of Coffee Bean Weevil, Araecerus fasciculatus"    Next AbstractCharacteristics and sources of volatile organic compounds during pollution episodes and clean periods in the Beijing-Tianjin-Hebei region »

Environ Pollut

Title:		Haze formation indicator based on observation of critical carbonaceous species in the atmosphere
Author(s):		Yang S; Duan F; Ma Y; He K; Zhu L; Ma T; Ye S; Li H; Huang T; Kimoto T;
Address:		"State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Tsinghua University, Beijing, 100084, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Tsinghua University, Beijing, 100084, China. Electronic address: duanfk@tsinghua.edu.cn. Kimoto Electric Co. Ltd, Funahashi-Cho, Tennouji-Ku, Osaka, 543-0024, Japan"
Journal Title:		Environ Pollut
Year:		2019
Volume:		20181004
Issue:
Page Number:		84 - 92
DOI:		10.1016/j.envpol.2018.10.006
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Organic aerosol (OA) are always the most abundant species in terms of relative proportion to PM(2.5) concentration in Beijing, while in previous studies, poor link between carbonaceous particles and their gaseous precursors were established based on field observation results. Through this study, we provided a comprehensive analysis of critical carbonaceous species in the atmosphere. The concentrations, diurnal variations, conversions, and gas-particle partitioning (F-factor) of 8 carbonaceous species, carbon dioxide (CO(2)), carbon monoxide (CO), methane (CH(4)), volatile organic compounds (VOCs), non-methane hydrocarbon (NMHC), organic carbon (OC), elemental carbon (EC), and water soluble organic compounds (WSOCs), in Beijing were analyzed synthetically. Carbonaceous gases (CO, CO(2), VOCs, and CH(4)) and OC/EC ratios exhibited double-peak diurnal patterns with a pronounced midnight peak, especially in winter. High correlation between VOCs and OC during winter nighttime indicated that OC was formed from VOCs precursors via an unknown mechanism at relative humidity greater than 50% and 80%, thereby promoting WSOC formation in PM(1) and PM(2.5) respectively. The established F-factor method was effective to describe gas-to-particle transformation of carbonaceous species and was a good indicator for haze events since high F-factors corresponded with enhanced PM(2.5) level. Moreover, higher F-factors in winter indicated carbonaceous species were more likely to exist as particles in Beijing. These results can help gain a comprehensive understanding of carbon cycle and formation of secondary organic aerosols from gaseous precursors in the atmosphere"
Keywords:		Aerosols/analysis Air Pollutants/*analysis Air Pollution Atmosphere/analysis Beijing Carbon/*analysis Carbon Cycle Carbon Dioxide/analysis Carbon Monoxide/analysis China Environmental Monitoring/*methods *Humidity Methane/analysis Organic Chemicals/*analy;
Notes:		"MedlineYang, Shuo Duan, Fengkui Ma, Yongliang He, Kebin Zhu, Lidan Ma, Tao Ye, Siqi Li, Hui Huang, Tao Kimoto, Takashi eng England 2018/10/17 Environ Pollut. 2019 Jan; 244:84-92. doi: 10.1016/j.envpol.2018.10.006. Epub 2018 Oct 4"