Humidity Dependence of the Condensational Growth of Pinene Secondary Organic Aerosol Particles
View/ Open
Author
Jianhuai, Ye
Paul, Ohno
Jinghao, Zhai
Yuemei, Han
Pengfei, Liu
Junfeng, Wang
Rahul A., Zaveri
Scot T., Martin
Published Version
https://doi.org/10.1021/acs.est.1c01738.s001Metadata
Show full item recordCitation
Qin, Yi Ming, Ye Jianhuai, Ohno Paul, Zhai Jinghao, Han Yuemei, Liu Pengfei, Wang Junfeng et al. "Humidity Dependence of the Condensational Growth of Pinene Secondary Organic Aerosol Particles." Environmental Science & Technology 55, no. 21 (2021): 14360–14369. DOI: 10.1021/acs.est.1c01738.s001Abstract
The influence of relative humidity (RH) on the condensational growth of organic aerosol particles remains incompletely understood. Herein, the RH dependence was investigated via a series of experiments for α-pinene ozonolysis in a continuously mixed flow chamber in which recurring cycles of particle growth occurred every 7 to 8 h at a given RH. In 5 h, the mean increase in the particle mode diameter was 15 nm at 0% RH and 110 nm at 75% RH. The corresponding particle growth coefficients, representing a combination of the thermodynamic driving force and the kinetic resistance to mass transfer, increased from 0.35 to 2.3 nm2 s–1. The chemical composition, characterized by O:C and H:C atomic ratios of 0.52 and 1.48, respectively, and determined by mass spectrometry, did not depend on RH. The Model for Simulating Aerosol Interactions and Chemistry (MOSAIC) was applied to reproduce the observed size- and RH-dependent particle growth by optimizing the diffusivities Db within the particles of the condensing molecules. The Db values increased from 5 α–1 × 10–16 at 0% RH to 2 α–1 × 10–12 cm–2 s–1 at 75% RH for mass accommodation coefficients α of 0.1 to 1.0, highlighting the importance of particle-phase properties in modeling the growth of atmospheric aerosol particles.Terms of Use
This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#PassThruCitable link to this page
https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37377058
Collections
- FAS Scholarly Articles [18295]
Contact administrator regarding this item (to report mistakes or request changes)