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Environ Sci Technol

Title:		"Contrasting diurnal variations in fossil and nonfossil secondary organic aerosol in urban outflow, Japan"
Author(s):		Morino Y; Takahashi K; Fushimi A; Tanabe K; Ohara T; Hasegawa S; Uchida M; Takami A; Yokouchi Y; Kobayashi S;
Address:		"National Institute for Environmental Studies, Ibaraki, Japan. morino.yu@nies.go.jp"
Journal Title:		Environ Sci Technol
Year:		2010
Volume:		44
Issue:		22
Page Number:		8581 - 8586
DOI:		10.1021/es102392r
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Diurnal variations of fossil secondary organic carbon (SOC) and nonfossil SOC were determined for the first time using a combination of several carbonaceous aerosol measurement techniques, including radiocarbon ((1)(4)C) determinations by accelerator mass spectrometry, and a receptor model (chemical mass balance, CMB) at a site downwind of Tokyo during the summer of 2007. Fossil SOC showed distinct diurnal variation with a maximum during daytime, whereas diurnal variation of nonfossil SOC was relatively small. This behavior was reproduced by a chemical transport model (CTM). However, the CTM underestimated the concentration of anthropogenic secondary organic aerosol (ASOA) by a factor of 4-7, suggesting that ASOA enhancement during daytime is not explained by production from volatile organic compounds that are traditionally considered major ASOA precursors. This result suggests that unidentified semivolatile organic compounds or multiphase chemistry may contribute largely to ASOA production. As our knowledge of production pathways of secondary organic aerosol (SOA) is still limited, diurnal variations of fossil and nonfossil SOC in our estimate give an important experimental constraint for future development of SOA models"
Keywords:		"Aerosols/*analysis/chemistry Air Movements Air Pollutants/*analysis/chemistry Carbon/*analysis/chemistry Circadian Rhythm Cities Environmental Monitoring/methods Fossil Fuels/*analysis Japan Kinetics Models, Chemical;"
Notes:		"MedlineMorino, Yu Takahashi, Katsuyuki Fushimi, Akihiro Tanabe, Kiyoshi Ohara, Toshimasa Hasegawa, Shuichi Uchida, Masao Takami, Akinori Yokouchi, Yoko Kobayashi, Shinji eng 2010/10/05 Environ Sci Technol. 2010 Nov 15; 44(22):8581-86. doi: 10.1021/es102392r"