Articles | Volume 15, issue 1
https://doi.org/10.5194/acp-15-253-2015
https://doi.org/10.5194/acp-15-253-2015
Research article
 | 
12 Jan 2015
Research article |  | 12 Jan 2015

Elemental ratio measurements of organic compounds using aerosol mass spectrometry: characterization, improved calibration, and implications

M. R. Canagaratna, J. L. Jimenez, J. H. Kroll, Q. Chen, S. H. Kessler, P. Massoli, L. Hildebrandt Ruiz, E. Fortner, L. R. Williams, K. R. Wilson, J. D. Surratt, N. M. Donahue, J. T. Jayne, and D. R. Worsnop

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Manjula Canagaratna on behalf of the Authors (17 Nov 2014)  Author's response   Manuscript 
ED: Publish as is (25 Nov 2014) by Nga Lee Ng
AR by Manjula Canagaratna on behalf of the Authors (25 Nov 2014)  Manuscript 
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Short summary
Atomic oxygen-to-carbon (O:C), hydrogen-to-carbon (H:C), and organic mass-to-organic carbon (OM:OC) ratios of ambient organic aerosol (OA) species provide key constraints for understanding their sources and impacts. Here an improved method for obtaining accurate O:C, H:C, and OM:OC with a widely used aerosol mass spectrometer is developed. These results imply that OA is more oxidized than previously estimated and indicate the need for new chemical mechanisms that simulate ambient oxidation.
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