Articles | Volume 19, issue 2
Atmos. Chem. Phys., 19, 941–954, 2019
Atmos. Chem. Phys., 19, 941–954, 2019

Research article 24 Jan 2019

Research article | 24 Jan 2019

Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility

Jian Wang et al.


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Jian Wang on behalf of the Authors (21 Nov 2018)  Author's response    Manuscript
ED: Publish as is (21 Nov 2018) by Maria Cristina Facchini
Short summary
Earlier studies showed organic hygroscopicity increases with oxidation level. Such increases have been attributed to higher water solubility for more oxidized organics. By systematically varying the water content of activating droplets, we show that for secondary organic aerosols, essentially all organics are dissolved at the point of droplet activation. Therefore, the organic hygroscopicity is not limited by solubility but is dictated mainly by the molecular weight of organic species.
Final-revised paper