Articles | Volume 15, issue 1
Atmos. Chem. Phys., 15, 253–272, 2015
https://doi.org/10.5194/acp-15-253-2015
Atmos. Chem. Phys., 15, 253–272, 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 et al.

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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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