Real-time measurements of ambient aerosols in a polluted Indian city: Sources, characteristics, and processing of organic aerosols during foggy and nonfoggy periods
Abhishek Chakraborty,Deepika Bhattu,Tarun Gupta,Sachchida Nand Tripathi,Manjula R. Canagaratna +4 more
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In this article, a detailed time-resolved chemical characterization of ambient nonrefractory submicron aerosols (NR-PM1) was conducted for the first time in India.Abstract:
A detailed time-resolved chemical characterization of ambient nonrefractory submicron aerosols (NR-PM1) was conducted for the first time in India. The measurements were performed during the winter (November 2011 to January 2012) in a heavily polluted city of Kanpur, which is situated in the Indo-Gangetic Plain. Real-time measurements provided new insights into the sources and evolution of organic aerosols (OA) that could not be obtained using previously deployed filter-based measurements at this site. The average NR-PM1 loading was very high (>100 µg/m3) throughout the study, with OA contributing approximately 70% of the total aerosol mass. Source apportionment of the OA using positive matrix factorization revealed large contributions from fresh and aged biomass burning OA throughout the entire study period. A back trajectory analysis showed that the polluted air masses were affected by local sources and distant source regions where the burning of paddy residues occurs annually during winter. Several fog episodes were encountered during the study, and the OA composition varied between foggy and nonfoggy periods, with higher oxygen to carbon (O/C) ratios during the foggy periods. The evolution of OA and their elemental ratios (O:C and H:C) were investigated for the possible effects of fog processing.read more
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Journal ArticleDOI
Effects of Aqueous-Phase and Photochemical Processing on Secondary Organic Aerosol Formation and Evolution in Beijing, China
Weiqi Xu,Tingting Han,Wei Du,Qingqing Wang,Chen Chen,Jian Zhao,Yingjie Zhang,Yingjie Zhang,Jie Li,Pingqing Fu,Zifa Wang,Douglas R. Worsnop,Yele Sun,Yele Sun +13 more
TL;DR: It is shown that aqueous-phase processing has a dominant impact on the formation of more oxidized SOA (MO-OOA), and the contribution of MO-OO a to OA increases substantially as a function of relative humidity or liquid water content, while episodes analyses highlight that LO-OOB plays a more important role during the early stage of the formationof autumn/winter haze episodes while MO-ooA is more significant during the later evolution period.
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Submicron aerosol composition in the world's most polluted megacity: the Delhi Aerosol Supersite study
Shahzad Gani,Sahil Bhandari,Sarah Seraj,Dongyu S. Wang,KG Patel,Prashant Soni,Zainab Arub,Gazala Habib,Lea Hildebrandt Ruiz,Joshua S. Apte +9 more
TL;DR: In this paper, the authors report on 1.25 years of highly time-resolved speciated submicron particulate matter (PM 1 ) data, including black carbon (BC) and non-refractory PM 1 (NR-PM 1 ), which they combine to develop a composition-based estimate of PM 1.
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Variation in global chemical composition of PM 2.5 : emerging results from SPARTAN
Graydon Snider,Crystal L. Weagle,Kalaivani K. Murdymootoo,Amanda Ring,Yvonne Ritchie,Emily Stone,Ainsley Walsh,Clement Akoshile,Nguyen Xuan Anh,Rajasekhar Balasubramanian,Jeffrey R. Brook,Fatimah D. Qonitan,Jinlu Dong,D. Griffith,Kebin He,Brent N. Holben,Ralph A. Kahn,Nofel Lagrosas,Puji Lestari,Zongwei Ma,Amit Misra,Leslie K. Norford,Eduardo Quel,Abdus Salam,Bret A. Schichtel,Lior Segev,Sachchida Tripathi,Chien Wang,Chao Yu,Qiang Zhang,Yuxuan Zhang,Michael Brauer,Aaron Cohen,Mark D. Gibson,Yang Liu,J. Vanderlei Martins,Yinon Rudich,Randall V. Martin,Randall V. Martin +38 more
TL;DR: The surface particulate mAtter network (SPARTAN) is a long-term project that includes characterization of chemical and physical attributes of aerosols from filter samples collected worldwide.
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Chemical Differences Between PM1 and PM2.5 in Highly Polluted Environment and Implications in Air Pollution Studies
Yele Sun,Yao He,Ye Kuang,Wanyun Xu,Shaojie Song,Nan Ma,Jiangchuan Tao,Peng Cheng,Cheng Wu,Hang Su,Yafang Cheng,Conghui Xie,Chun Chen,Lu Lei,Yanmei Qiu,Pingqing Fu,Philip Croteau,Douglas R. Worsnop +17 more
Journal ArticleDOI
A review of aerosol chemistry in Asia: insights from aerosol mass spectrometer measurements
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References
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Evolution of Organic Aerosols in the Atmosphere
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TL;DR: A unifying model framework describing the atmospheric evolution of OA that is constrained by high–time-resolution measurements of its composition, volatility, and oxidation state is presented, which can serve as a basis for improving parameterizations in regional and global models.
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