Significant formation of water‐insoluble secondary organic aerosols in semi‐arid urban environment
作者： Olivier Favez , Jean Sciare , Hélène Cachier , Stéphane C. Alfaro , Magdy M. Abdelwahab
DOI: 10.1029/2008GL034446
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摘要: [1] Diurnal variations of submicron elemental carbon (EC), water-soluble organic (WSOC) and water-insoluble (WIOC) were investigated at an urban background site in Cairo (Egypt) from 23 March to 14 April 2005. Well-marked diurnal patterns, with minima during the traffic-influenced morning period (6:00–9:00) maxima intense photochemical (12:00–15:00), observed for WSOC/EC ratio and, more surprisingly, WIOC/EC ratio. Such suggest significant formation both secondary aerosols afternoon. Applying EC-tracer method, freshly-formed (fresh SOC) was found possibly account than 50% OC concentrations measured 12:00–15:00 period, this fresh SOC calculated be mainly (∼60%) composed species. The latter (unexpected) result could due low ambient relative humidity as well importance anthropogenic volatile compounds Cairo.
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Q. Zhang, J. L. Jimenez, M. R. Canagaratna, J. D. Allan, H. Coe, I. Ulbrich, M. R. Alfarra, A. Takami, A. M. Middlebrook, Y. L. Sun, K. Dzepina, E. Dunlea, K. Docherty, P. F. DeCarlo, D. Salcedo, T. Onasch, J. T. Jayne, T. Miyoshi, A. Shimono, S. Hatakeyama, N. Takegawa, Y. Kondo, J. Schneider, F. Drewnick, S. Borrmann, S. Weimer, K. Demerjian, P. Williams, K. Bower, R. Bahreini, L. Cottrell, R. J. Griffin, J. Rautiainen, J. Y. Sun, Y. M. Zhang, D. R. Worsnop, Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically-influenced Northern Hemisphere midlatitudes Geophysical Research Letters. ,vol. 34, ,(2007) , 10.1029/2007GL029979
T. Novakov, S. Menon, T. W. Kirchstetter, D. Koch, J. E. Hansen, Aerosol organic carbon to black carbon ratios: Analysis of published data and implications for climate forcing Journal of Geophysical Research. ,vol. 110, ,(2005) , 10.1029/2005JD005977
M. Viana, W. Maenhaut, H.M. ten Brink, X. Chi, E. Weijers, X. Querol, A. Alastuey, P. Mikuška, Z. Večeřa, Comparative analysis of organic and elemental carbon concentrations in carbonaceous aerosols in three European cities Atmospheric Environment. ,vol. 41, pp. 5972- 5983 ,(2007) , 10.1016/J.ATMOSENV.2007.03.035
Chen Song, Rahul A. Zaveri, M. Lizabeth Alexander, Joel A. Thornton, Sasha Madronich, John V. Ortega, Alla Zelenyuk, Xiao-Ying Yu, Alexander Laskin, David A. Maughan, Effect of hydrophobic primary organic aerosols on secondary organic aerosol formation from ozonolysis of α‐pinene Geophysical Research Letters. ,vol. 34, ,(2007) , 10.1029/2007GL030720
Imre Salma, Rita Ocskay, Xuguang Chi, Willy Maenhaut, Sampling artefacts, concentration and chemical composition of fine water-soluble organic carbon and humic-like substances in a continental urban atmospheric environment Atmospheric Environment. ,vol. 41, pp. 4106- 4118 ,(2007) , 10.1016/J.ATMOSENV.2007.01.027
John H. Seinfeld, Garnet B. Erdakos, William E. Asher, James F. Pankow, Modeling the Formation of Secondary Organic Aerosol (SOA). 2. The Predicted Effects of Relative Humidity on Aerosol Formation in the α-Pinene-, β-Pinene-, Sabinene-, Δ3-Carene-, and Cyclohexene-Ozone Systems Environmental Science & Technology. ,vol. 35, pp. 1806- 1817 ,(2001) , 10.1021/ES001765+
J. Lathière, D. A. Hauglustaine, N. De Noblet-Ducoudré, G. Krinner, G. A. Folberth, Past and future changes in biogenic volatile organic compound emissions simulated with a global dynamic vegetation model Geophysical Research Letters. ,vol. 32, ,(2005) , 10.1029/2005GL024164
Babbara J Turpin, James J Huntzicker, Secondary formation of organic aerosol in the Los Angeles basin: A descriptive analysis of organic and elemental carbon concentrations Atmospheric Environment. Part A. General Topics. ,vol. 25, pp. 207- 215 ,(1991) , 10.1016/0960-1686(91)90291-E
Olivier Favez, Hélène Cachier, Jean Sciare, Stéphane C. Alfaro, Tarek M. El-Araby, Maha A. Harhash, Magdy M. Abdelwahab, Seasonality of major aerosol species and their transformations in Cairo megacity Atmospheric Environment. ,vol. 42, pp. 1503- 1516 ,(2008) , 10.1016/J.ATMOSENV.2007.10.081
A. P. Sullivan, R. J. Weber, A. L. Clements, J. R. Turner, M. S. Bae, J. J. Schauer, A method for on‐line measurement of water‐soluble organic carbon in ambient aerosol particles: Results from an urban site Geophysical Research Letters. ,vol. 31, ,(2004) , 10.1029/2004GL019681