Humidity Dependence of the Condensational Growth of α-Pinene Secondary Organic Aerosol Particles

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Jianhuai Ye
  • Paul Ohno
  • Jinghao Zhai
  • Yuemei Han
  • Pengfei Liu
  • Junfeng Wang
  • Rahul A. Zaveri
  • Scot T. Martin

Detail(s)

Original languageEnglish
Pages (from-to)14360-14369
Journal / PublicationEnvironmental Science and Technology
Volume55
Issue number21
Online published18 Aug 2021
Publication statusPublished - 2 Nov 2021
Externally publishedYes

Link(s)

Abstract

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 nm2s-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× 10-12cm-2s-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. © 2021 The Authors. Published by American Chemical Society

Research Area(s)

  • aerosol particle growth dynamics, aerosol particle size distribution, atmospheric particles, mass accommodation coefficient, particle-phase diffusivity

Citation Format(s)

Humidity Dependence of the Condensational Growth of α-Pinene Secondary Organic Aerosol Particles. / Qin, Yiming; Ye, Jianhuai; Ohno, Paul et al.
In: Environmental Science and Technology, Vol. 55, No. 21, 02.11.2021, p. 14360-14369.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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