Articles | Volume 18, issue 23
Atmos. Chem. Phys., 18, 17307–17323, 2018
https://doi.org/10.5194/acp-18-17307-2018
Atmos. Chem. Phys., 18, 17307–17323, 2018
https://doi.org/10.5194/acp-18-17307-2018

Research article 06 Dec 2018

Research article | 06 Dec 2018

The underappreciated role of nonvolatile cations in aerosol ammonium-sulfate molar ratios

Hongyu Guo et al.

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Latest update: 29 Nov 2021
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Short summary
Overprediction of fine-particle ammonium-sulfate molar ratios (R) by thermodynamic models is suggested as evidence for organic aerosol limiting the condensation of ammonia onto particles, with significant impacts on aerosol chemistry. We find that the effects of small amounts of salt and dust, combined with measurement artifacts, explain the discrepancy in R. These results are highly insensitive to mixing state. This means that aerosol predictions are much more robust than thought before.
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