Molecular Markers of Secondary Organic Aerosol in Mumbai, India

• Published in: Environmental Science & Technology
• Main Authors: Fu, Pingqing, Aggarwal, Shankar G., Chen, Jing, Li, Jie, Sun, Yele, Wang, Zifa, Chen, Huansheng, Liao, Hong, Ding, Aijun, Umarji, G. S., Patil, R. S., Chen, Qi, Kawamura, Kimitaka
• Other Authors: Fu, PQ (reprint author), Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China.; Fu, PQ (reprint author), Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan., Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China., Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan., Natl Phys Lab, CSIR, Dr Krishnan Rd, New Delhi 110012, India., Chinese Acad Sci, Inst Geochem, SKLEG, Guiyang 550081, Peoples R China., Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China., Nanjing Univ, Inst Climate & Global Change Res, Nanjing 210093, Jiangsu, Peoples R China., Nanjing Univ, Sch Atmospher Sci, Nanjing 210093, Jiangsu, Peoples R China., Indian Inst Technol, Ctr Environm Sci & Engn, Bombay 400076, Maharashtra, India., Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China., Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Jiangsu, Peoples R China., Fu, PQ (reprint author), Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan.
• Format: Journal/Newspaper
• Language: English
• Published: ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016
• Subjects: BOREAL FOREST AEROSOLS; ATMOSPHERIC AEROSOLS; OXIDATION-PRODUCTS; ALPHA-PINENE; ISOPRENE PHOTOOXIDATION; DIEL VARIATIONS; PM2.5 AEROSOLS; SOUTHERN-OCEAN; TRACERS; SUMMER; Southern Ocean
• Online Access: https://hdl.handle.net/20.500.11897/434236; https://doi.org/10.1021/acs.est.6b00372

Biogenic secondary organic aerosols (SOA) are generally considered to be more abundant in summer than in winter. Here, polar organic marker compounds in urban background aerosols from Mumbai were measured using gas chromatography-mass spectrometry. Surprisingly, we found that concentrations of biogenic SOA tracers at Mumbai were several times lower in summer (8-14 June 2006; wet season; n = 14) than in winter (13-18 February 2007; dry season; n = 10). Although samples from less than 10% of the season are extrapolated to the full season, such seasonality may be explained, by the predominance of the southwest summer monsoon, which brings clean marine air masses to Mumbai. While heavy rains are an important contributor to aerosol removal during the monsoon season, meteorological data (relative humidity and T) suggest no heavy rains occurred during our sampling period. However, in winter, high levels of SOA and their day/night differences suggest significant contributions of continental aerosols through long-range transport together with local sources. The winter/summer pattern of SOA loadings was further supported by results from chemical transport models (NAQPMS and GEOS-Chem). Furthermore, our study suggests that monoterpene- and sesquiterpene-derived secondary organic carbon. (SOC) were more significant than those of isoprene- and toluene-SOC at Mumbai. National Natural Science Foundation of China [41475117, 41175106]; Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [19204055, 24221001]; Japan Society for the Promotion of Science (JSPS); "One Hundred Talents" program of Chinese Academy of Sciences SCI(E) EI PubMed ARTICLE [e-mail] 9 4659-4667 50