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Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically‐influenced Northern Hemisphere midlatitudes

2007; American Geophysical Union; Volume: 34; Issue: 13 Linguagem: Inglês

10.1029/2007gl029979

1944-8007

Q. Zhang, J. L. Jiménez, Manjula R. Canagaratna, J. D. Allan, Hugh Coe, I. M. Ulbrich, M. Rami Alfarra, Akinori Takami, A. M. Middlebrook, Yele Sun, K. Džepina, E. J. Dunlea, K. S. Docherty, P. F. DeCarlo, D. Salcedo, T. B. Onasch, John T. Jayne, Takao Miyoshi, Atsushi Shimono, Shiro Hatakeyama, N. Takegawa, Y. Kondo, Johannes Schneider, Frank Drewnick, Stephan Borrmann, S. Weimer, Kenneth L. Demerjian, P. I. Williams, Keith Bower, R. Bahreini, L. Cottrell, Robert J. Griffin, Jani Rautiainen, Junying Sun, Yuhong Zhang, Douglas R. Worsnop,

Atmospheric and Environmental Gas Dynamics

Organic aerosol (OA) data acquired by the Aerosol Mass Spectrometer (AMS) in 37 field campaigns were deconvolved into hydrocarbon‐like OA (HOA) and several types of oxygenated OA (OOA) components. HOA has been linked to primary combustion emissions (mainly from fossil fuel) and other primary sources such as meat cooking. OOA is ubiquitous in various atmospheric environments, on average accounting for 64%, 83% and 95% of the total OA in urban, urban downwind, and rural/remote sites, respectively. A case study analysis of a rural site shows that the OOA concentration is much greater than the advected HOA, indicating that HOA oxidation is not an important source of OOA, and that OOA increases are mainly due to SOA. Most global models lack an explicit representation of SOA which may lead to significant biases in the magnitude, spatial and temporal distributions of OA, and in aerosol hygroscopic properties.