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Title: Quantifying Impacts of Aerosol Mixing State on Nucleation-Scavenging of Black Carbon Aerosol Particles

Journal Article · · Atmosphere (Basel)
DOI:https://doi.org/10.3390/atmos9010017· OSTI ID:1501893
 [1];  [2]; ORCiD logo [2]
  1. Meteorological Research Inst. (MRI), Tsukuba (Japan)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States)

Recent observational studies suggest that nucleation-scavenging is the principal path to removing black carbon-containing aerosol from the atmosphere, thus affecting black carbon’s lifetime and radiative forcing. Modeling the process of nucleation-scavenging is challenging, since black carbon (BC) forms complex internal mixtures with other aerosol species. Here, we examined the impacts of black carbon mixing state on nucleation scavenging using the particle-resolved aerosol model PartMC-MOSAIC. This modeling approach has the unique advantage that complex aerosol mixing states can be represented on a per-particle level. For a scenario library that comprised hundreds of diverse aerosol populations, we quantified nucleation-scavenged BC mass fractions. Consistent with measurements, these vary widely, depending on the amount of BC, the amount of coating and coating material, as well as the environmental supersaturation. We quantified the error in the nucleation-scavenged black carbon mass fraction introduced when assuming an internally mixed distribution, and determined its bounds depending on environmental supersaturation and on the aerosol mixing state index χ . For a given χ value, the error decreased at higher supersaturations. For more externally mixed populations (χ <20%), the nucleation-scavenged BC mass fraction could be overestimated by more than 1000% at supersaturations of 0.1%, while for more internally mixed populations (χ >75%), the error was below 100% for the range of supersaturations (from 0.02% to 1%) investigated here. Thus, accounting for black carbon mixing state and knowledge of the supersaturation of the environment are crucial when determining the amount of black carbon that can be incorporated into clouds.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Atmospheric System Research (ASR)
Grant/Contract Number:
SC0011771
OSTI ID:
1501893
Journal Information:
Atmosphere (Basel), Vol. 9, Issue 1; ISSN 2073-4433
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (5)

Aerosol mixing state revealed by transmission electron microscopy pertaining to cloud formation and human airway deposition journal July 2019
Recent Advances in Quantifying Wet Scavenging Efficiency of Black Carbon Aerosol journal April 2019
Preface: Morphology and Internal Mixing of Atmospheric Particles journal July 2018
Droplet activation behaviour of atmospheric black carbon particles in fog as a function of their size and mixing state journal January 2019
Cloud droplet activation properties and scavenged fraction of black carbon in liquid-phase clouds at the high-alpine research station Jungfraujoch (3580 m a.s.l.) journal January 2019